Late Pleistocene And Holocene Aged Glacial And Climate Reconstructions In The Goat Rocks Wilderness Washington United States

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Late Pleistocene and Holocene Aged Glacial and Climate Reconstructions in the Goat Rocks Wilderness, Washington, United States

Author : Joshua Andrews Heard
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (859 download)

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Book Synopsis Late Pleistocene and Holocene Aged Glacial and Climate Reconstructions in the Goat Rocks Wilderness, Washington, United States by : Joshua Andrews Heard

Download or read book Late Pleistocene and Holocene Aged Glacial and Climate Reconstructions in the Goat Rocks Wilderness, Washington, United States written by Joshua Andrews Heard and published by . This book was released on 2012 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Eight glaciers, covering an area of 1.63 km2, reside on the northern and northeastern slopes of the Goat Rocks tallest peaks in the Cascades of central Washington. At least three glacial stands occurred downstream from these glaciers. Closest to modern glacier termini are Little Ice Age (LIA) moraines that were deposited between 1870 and 1899 AD, according to the lichenometric analysis. They are characterized by sharp, minimally eroded crests, little to no soil cover, and minimal vegetation cover. Glacier reconstructions indicate that LIA glaciers covered 8.29 km2, 76% more area than modern ice coverage. The average LIA equilibrium line altitude (ELA) of 1995 ± 70 m is ~150 m below the average modern ELA of 2149 ± 76 m. To satisfy climate conditions at the LIA ELA, the winter snow accumulation must have been 8 to 43 cm greater and mean summer temperatures 0.2 to 1.3 oC cooler than they are now. Late Pleistocene to early Holocene (LPEH) aged moraines are located between 100 and 400 m below the LIA deposits. They have degraded moraine crests, few surface boulders, and considerable vegetation and soil cover. Volcanic ashes indicate LPEH moraines were deposited before 1480 AD while morphometric data suggest deposition during the late Pleistocene or early Holocene. The average LPEH ELA of 1904 ± 110 m is ~ 240 m and ~90 m below the modern and LIA ELAs, respectively. The climate change necessary to maintain a glacier with an ELA at that elevation for LPEH conditions requires the winter accumulation to increase by 47 to 48 cm weq and the mean summer temperature to cool by 1.4 to 1.5 oC. Last glacial maximum (LGM) moraines are located more than 30 km downstream from modern glacial termini. They are characterized by hummocky topography, rounded moraine crests, complete vegetation cover, and well developed soil cover. Moraine morphometry, soil characteristics, and distance from modern glacial termini indicate that deposition occurred at least 15 ka BP during an expansive cooling event, the last being the LGM. The LGM ELA of 1230 m is ~920 m below the modern ELA. The climate change necessary to maintain a glacier with an ELA at that elevation for LGM conditions requires the mean summer temperature to cool by 5.6 oC with no change in precipitation.

10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska

Download 10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska PDF Online Free

Author : Simon L. Pendleton
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (875 download)

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Book Synopsis 10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska by : Simon L. Pendleton

Download or read book 10Be Chronology of Late Pleistocene and Holocene Glaciation of the Alapah Mountain and Arrigetch Peaks Areas, Central Brooks Range, Alaska written by Simon L. Pendleton and published by . This book was released on 2013 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The amplification of climate change in the Arctic is due to several cyrosphere related feedback mechanisms, making it one of the most climate sensitive environments in the world. Due to this sensitivity, glaciers in this region are excellent recorders of past climate fluctuations. This high-resolution chronology left on the land by these glaciers is an important link in deciphering the dynamic relationship between glaciers and climate, leading to a better understanding of the extent and magnitude of past Arctic climate variability. Here we present new 10Be based glacier chronologies from the late Pleistocene through the Little Ice Age (LIA) for two valleys located in the north- and south-central Brooks range, Alaska. Moraine boulders from the Alapah Mountain moraines on the northern flank of the range indicate that the Itkillik III glaciation culminated by ~17 ka. This age is much older than previous estimates (~15-13 ka) and suggests a revision of the original late Pleistocene glacial chronology. This new Itkillik chronology requires substantial glacial retreat between ~27-23 ka, at the height of the northern hemisphere last glacial maximum (LGM). Due to their moisture sensitivity, expanded Arctic sea ice may have starved glaciers of precipitation during this time. Erratic boulders and scoured bedrock from several valleys in both the northern and southern Brooks Range show that deglaciation was underway by ~16 ka and glaciers retreated rapidly up valley to their Neoglacial limits, in some case by 14. 9 ℗ł 0. 8 ka. Sampled boulders from two Neoglacial moraines show that glaciers reached their maximum Holocene extent by 3. 2 ℗ł 0. 3 ka. In conjunction, these ages show that glaciers remained at or behind their Holocene maximum from ~14-3 ka. This means that Late Glacial (14-11 ka) or early to middle Holocene advances were either absent or less extensive than their Holocene maximum.

Chronology and Paleoclimate of Late Pleistocene Glaciation in the Klamath Mountains, CA

Author : Nathan W. Dickey
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (124 download)

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Book Synopsis Chronology and Paleoclimate of Late Pleistocene Glaciation in the Klamath Mountains, CA by : Nathan W. Dickey

Download or read book Chronology and Paleoclimate of Late Pleistocene Glaciation in the Klamath Mountains, CA written by Nathan W. Dickey and published by . This book was released on 2016 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glaciers are sensitive to local and global climate variations, especially to changes in precipitation and temperature over sub-millennial timescales. Therefore, glacial deposits are excellent tools for reconstructing past climates. The western United States exhibits an excellent record of glaciation, but ongoing work across the region shows complex and yetunexplained variation in timing and extent of deglaciation between different mountain ranges at the end of the Last Glacial Maximum (LGM). The Trinity Alps of the southern Klamath Mountains in Northern California contain an excellent record of Pleistocene glaciation which I use to fill a significant spatial gap in published glacial chronologies and to provide a bridge between the Sierra Nevada and the Cascades. The Trinity Alps Wilderness is a 2,130 sq. km. federally designated area located at 41.00° N, 123.00°W, approximately 60 km southwest of Mt. Shasta in Northern California. Glacial deposits in the Trinity Alps were located using Google Earth and previously published maps, and were confirmed in the field. Building on a series of previous expeditions, in the summer of 2015 twenty-four samples from five moraines were taken for 10Be exposure dating, as well as three samples from striated bedrock. Of these, six samples were selected for exposure age analysis: five from two early LGM moraines and one from an older moraine. These ages, in addition to twenty-four ages determined in a previous study, provide evidence for at least two stages of post-LGM glaciation of similar extent throughout the Trinity Alps: the first ending at 16.83 ± 1.85 ka, the second at 12.29 ± 1.23 ka. These ages correlate with the regional LGM (~17 ka) and the global Younger Dryas (~12 ka) cooling event, respectively. The moraine maps were then used to constrain results from a climate-driven 2D numerical model of glacier mass balance and flow. This model was used to determine the potential precipitation and temperature difference from modern climate that would generate the mapped glaciers. Comparison of the resulting paleoclimate curves with nearby proxies and global climate models suggest that an approximate 5.5°C decrease in temperature and 0 to 25% increase in precipitation drove LGM glaciation in the region. Additionally, these results suggest that a similarly wet but slightly warmer-than-LGM climate drove a regionally asynchronous re-advance in the Trinity Alps linked with the Younger Dryas cooling event.

Climate Reconstruction Using Trace Element and Stable Isotope Signatures Preserved in an Early Late Pleistocene Stalagmite from Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, USA

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Author : Ashley Rachelle Wright
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (797 download)

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Book Synopsis Climate Reconstruction Using Trace Element and Stable Isotope Signatures Preserved in an Early Late Pleistocene Stalagmite from Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, USA by : Ashley Rachelle Wright

Download or read book Climate Reconstruction Using Trace Element and Stable Isotope Signatures Preserved in an Early Late Pleistocene Stalagmite from Buckeye Creek Cave, Appalachian Mountains, Southern West Virginia, USA written by Ashley Rachelle Wright and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An early-Late Pleistocene stalagmite was recovered from Buckeye Creek Cave (37°58.57'N, 80°23.98'W), southeastern West Virginia, USA. The growth axis of stalagmite BCC-025 was sampled for ð18O, ð13C, and Sr/Ca of the calcite. A crude age model was developed using two Th-230 ages, from the top (~490 kyrBP) and bottom (~630 kyrBP) of the stalagmite. A more elaborate age model for stalagmite growth was developed using established marine isotope stage (MIS 13/14, 14/15, 15/16) boundaries. Overall, the MIS boundaries approximate the locations of major hiatuses along the axis of stalagmite growth. The proxy records developed from BCC-025 reveal less covariation and overall diminished absolute ranges when compared to younger records, potentially, because the glacial/interglacial variability of the early-Late Pleistocene is less than that of the Late Pleistocene. Despite the need for better age constraints, the observations and interpretations provide an initial window into the drivers and extent of climate change before the more pronounced swings of glacial/interglacial variability of the Late Pleistocene.

Environments and Extinctions

Author : Jim I. Mead
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Environments and Extinctions by : Jim I. Mead

Download or read book Environments and Extinctions written by Jim I. Mead and published by . This book was released on 1985 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: 10 papers using new conceptual frameworks to interpret late Quaternary cultural and environmental remains. Chapters are composed largely of the proceedings of a symposium held at the Society for American Archaeology meetings in 1982.

The Geologic Record of Climatic Change

Author : Thomas J. Crowley
Publisher :
ISBN 13 :
Total Pages : 168 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis The Geologic Record of Climatic Change by : Thomas J. Crowley

Download or read book The Geologic Record of Climatic Change written by Thomas J. Crowley and published by . This book was released on 1982 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Late Holocene Climate and Glacier Response Reconstructed Using Stratigraphy and Lichenometry at Iceberg Lake, Alaska

Author : Michael Gregg Loso
Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.:/5 (71 download)

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Book Synopsis Late Holocene Climate and Glacier Response Reconstructed Using Stratigraphy and Lichenometry at Iceberg Lake, Alaska by : Michael Gregg Loso

Download or read book Late Holocene Climate and Glacier Response Reconstructed Using Stratigraphy and Lichenometry at Iceberg Lake, Alaska written by Michael Gregg Loso and published by . This book was released on 2004 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ice Age National Scientific Reserve

Author : United States. National Park Service
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Ice Age National Scientific Reserve by : United States. National Park Service

Download or read book Ice Age National Scientific Reserve written by United States. National Park Service and published by . This book was released on 1962 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Late Paleozoic Glacial Events and Postglacial Transgressions in Gondwana

Author : Oscar R. López-Gamundí
Publisher : Geological Society of America
ISBN 13 : 0813724686
Total Pages : 218 pages
Book Rating : 4.8/5 (137 download)

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Book Synopsis Late Paleozoic Glacial Events and Postglacial Transgressions in Gondwana by : Oscar R. López-Gamundí

Download or read book Late Paleozoic Glacial Events and Postglacial Transgressions in Gondwana written by Oscar R. López-Gamundí and published by Geological Society of America. This book was released on 2010 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Reconstructing High-resolution Paleoclimate for Portions of the Last 250,000 Years from Cave of the Mounds Speleothems

Author : Cameron Jean Batchelor
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Book Synopsis Reconstructing High-resolution Paleoclimate for Portions of the Last 250,000 Years from Cave of the Mounds Speleothems by : Cameron Jean Batchelor

Download or read book Reconstructing High-resolution Paleoclimate for Portions of the Last 250,000 Years from Cave of the Mounds Speleothems written by Cameron Jean Batchelor and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pleistocene period was a time of Earth's History marked by 100-kyr paced glacial-interglacial cycles and dominated by the influence of polar glaciation that stimulated Earth system feedbacks. Climate archives that grew during the Pleistocene thus provide the opportunity to explore past climate variability during a time of known global forcings and when distinct climate transitions occurred. Other than ice cores - one of the most robust terrestrial climate archives used by the paleoclimate community - speleothem-based paleoclimate reconstructions provide some of the highest-resolution continental climate records. This is due to their ability to be precisely dated, relatively continuous growth potential that is uninterrupted by surficial erosional processes, and because they form within carbonate (karst) rocks which are located in a variety of locations from the low- to high-latitudes, and thus not restricted to one geographic location. For this dissertation, I use a collection of speleothem samples from a southwestern Wisconsin cave, Cave of the Mounds, to reconstruct paleoclimate for portions of the last 250,000 years. This dissertation seeks to (1) resolve high-resolution oxygen isotope (Îþ18O) records representative of mid-continental North America during former glacial and interglacial periods through the use of specialized imaging and mass spectrometry techniques, and (2) provide data that will characterize climate variability and regional climate response to distinct global forcings in a relatively data-sparse region of the world. Except for Chapter 1, which focuses on U-Th dating methods of speleothems, all chapters of this dissertation use specialized imaging (confocal laser fluorescent microscopy, CLFM) and mass spectrometry (secondary ion mass spectrometer, SIMS) techniques to produce high-resolution Îþ18O records during different time periods of the last 250,000 years. Each chapter focuses on a different time period of the last 250,000 years, specifically the Last Glacial Period (70-50 ka, respectively; Chapter 2), the Late Holocene (3-2 ka; Chapter 3), the Last Interglacial Period (122-118 ka, respectively; Chapter 4), and the Penultimate Interglacial Period (230-218 ka, respectively; Chapter 5).

Late Glacial and Holocene History of the Greenland Ice Sheet Margin in Nunatarssuaq, Northwestern Greenland

Author : Lauren Brett Farnsworth
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (961 download)

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Book Synopsis Late Glacial and Holocene History of the Greenland Ice Sheet Margin in Nunatarssuaq, Northwestern Greenland by : Lauren Brett Farnsworth

Download or read book Late Glacial and Holocene History of the Greenland Ice Sheet Margin in Nunatarssuaq, Northwestern Greenland written by Lauren Brett Farnsworth and published by . This book was released on 2016 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is uncertain as to how the Greenland Ice Sheet (GrIS) will respond to future climate changes. One means of assessing the sensitivity of the GrIS to projected climate conditions is to determine its response to past conditions. I reconstructed late glacial and Holocene (~15 ka-present) GrIS extents in the Nunatarssuaq, northwestern Greenland. I applied geomorphic mapping, 10Be surface exposure dating and 14C dating of subfossil plants to determine a chronology of past GrIS extents. I also analyzed sediment cores from a glacially fed lake. 10Be ages of boulders and bedrock exposed during deglaciation from the Last Glacial Maximum (LGM; ~26-19.5 ka) are apparently old due to 10Be inherited from prior periods of exposure. The youngest 10Be age (~15 ka) may also contain inherited 10Be but approximates the time of deglaciation. Subfossil plants transported to the GrIS margin on shear planes date to ~4.6 cal ka BP and indicate a less extensive GrIS during middle Holocene time. Geomorphic mapping documents higher levels of Nordsø, a glacial lake dammed by a more extensive GrIS margin. I constrain the age of this GrIS extent to ~3-2 ka using 14C ages of in situ subfossil plants on nunataks and 10Be ages of boulders on the drift deposited during the advance. A fresh drift occurs ~30-50 m beyond the present GrIS margin. 10Be ages of this fresh drift range from 2.2 to 0.5 ka. I interpret the youngest 10Be age (~0.5 ka) as the time the drift was exposed. 14C ages of in situ subfossil plants indicate that the GrIS was at or behind its present margin at AD ~1662-1897. I compare my record of GrIS extents to other glacial fluctuations and climate records. I find that the GrIS margin in Nunatarssuaq fluctuated at similar times as local ice masses and other GrIS margins. The middle Holocene GrIS recession occurred during relatively warm conditions registered by regional climate records and the late Holocene GrIS advances occurred during cooler conditions. I also document asynchronous GrIS margin fluctuations in Nunatarssuaq. These require further investigation to determine whether they were influenced by climate conditions or ice dynamics.

Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content?

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Author : De Anne S. Pinney Stevens
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (228 download)

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Book Synopsis Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? by : De Anne S. Pinney Stevens

Download or read book Deglaciation and Latest Pleistocene and Early Holocene Glacier Readvances on the Alaska Peninsula: Records of Rapid Climate Change Due to Transient Changes, in Solar Intensity and Atmospheric CO2 Content? written by De Anne S. Pinney Stevens and published by . This book was released on 1992 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geologic mapping near Windy Creek, Katmai National Park, identified two sets of glacial deposits postdating late-Wisconsin Iliuk moraines and separated from them by volcaniclastic deposits laid down under ice-free conditions. Radiocarbon dating of organic material incorporated in the younger Katolinat till and in adjacent peat and lake sediments suggests that alpine glaciers on the northern Alaska Peninsula briefly expanded between ca. 8500 and 10,000 years B.P. Stratigraphic relationships and radiocarbon dates suggest an age for the older Ukak drift near the Pleistocene-Holocene boundary between ca. 10,000 and 12,000 years B.P. We suggest that rapid deglaciation following deposition of the Iliuk drift occurred ca. 13,000-12,000 years B.P. in response to large increases in global atmospheric greenhouse gas content, including C02. Short-term decreases in these concentrations, as recorded in polar ice cores, may be linked with brief periods of glacier expansion during the latest Pleistocene and early Holocene. A transient episode of low solar intensity may also have occurred during parts of the early Holocene. Rapid environmental changes and glacial fluctuations on the Alaska Peninsula may have been in response to transient changes in the concentration of atmospheric greenhouse gases and solar intensity.

People in the Americas Before the Last Ice Age Glaciation Concluded

Author : Bonnye Matthews
Publisher : Publication Consultants
ISBN 13 : 1594337365
Total Pages : 53 pages
Book Rating : 4.5/5 (943 download)

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Book Synopsis People in the Americas Before the Last Ice Age Glaciation Concluded by : Bonnye Matthews

Download or read book People in the Americas Before the Last Ice Age Glaciation Concluded written by Bonnye Matthews and published by Publication Consultants. This book was released on 2017-09-01 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: WARNING: Everything you know about the peopling of the Americas is wrong. People in the Americas before the Last Ice Age Glaciation Concluded: An Emerging Paradigm on Western Hemisphere Population Origin covers the turn of the century emerging science on the origin of human population in the western hemisphere. It is a booklet that is designed to provide a reference bridge until the new information can be included in textbook presentations. With the ability to examine DNA evidence on extremely old human remains and findings at greater depth than formerly considered, information grows at a rapid rate. The science is in its infancy, but surprising finds occur moment by moment.

Late Pleistocene and Holocene Sediments Around South Georgia

Author : Nina-Marie Lešić
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (143 download)

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Book Synopsis Late Pleistocene and Holocene Sediments Around South Georgia by : Nina-Marie Lešić

Download or read book Late Pleistocene and Holocene Sediments Around South Georgia written by Nina-Marie Lešić and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The island of South Georgia, along with a number of other smaller islands, is part of a microcontinent surrounded by oceanic crust in the Atlantic sector of the sub-Antarctic. Oceanographically, South Georgia lies within the Antarctic Circumpolar Current (ACC), the broad oceanic current system that is driven by the Southern Hemisphere Westerlies (SHW) and climatically isolates the Antarctic continent from the warmer Northern Hemisphere. Its location in the middle of the ACC and its isolation from continental influences makes South Georgia a sensitive region, where climate changes are registered earlier than on the more thermally isolated Antarctic continent. So far, however, the timing and extent of the Last Glacial Maximum on South Georgia have not been completely resolved, mostly because radiocarbon dated sediment investigations are missing. This is mainly due to the lack of marine geological studies on the continental shelf of the southern side of the island, which is climatically much harsher and therefore less accessible than the northern side. This information, however, is important to create and evaluate reliable climate and ice sheet models. This thesis, based on the investigations of sediment cores, sediment echosounder profiles and high-resolution bathymetry data, closes important knowledge gaps in the King Haakon Trough System and Drygalski Fjord System on the southern shelf of South Georgia. For the latter, the radiocarbon-dated sediments reveal an extensive ice cap before 30 ka BP during the Local Last Glacial Maximum. In the King Haakon Trough System, the bathymetric and sediment echo-graphic mapping of this thesis also reveal shelf-wide glaciation, possibly related to the last glacial period. Furthermore, this thesis investigates the subsequent deglaciation and the traces left by climate variability and its drivers within the sedimentary records in the two cross-shelf troughs. The results show that the southern shelf environments were ice-free since before the Antarctic Cold Reversal and thus exposed to currents at least since the start of the Holocene. These likely reacted to climate fluctuations of the present interglacial and, therefore, impacted trough sedimentation. Thus, this thesis does not only provide evidence for past ice-extent, which is crucial for benchmarking modelling approaches, but also gives further insight into the Holocene climate variability and sedimentary processes around South Georgia, potentially even archiving shelf-intruding behaviour of the nearby Southern Antarctic Circumpolar Current Front (SACCF) for at least the last 8 ka BP.

Latest Pleistocene and Late Holocene Surface Exposure Ages from Two Marine-terminating Glaciers in Northwest Greenland

Author : Melissa M. Reusche
Publisher :
ISBN 13 :
Total Pages : 137 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Latest Pleistocene and Late Holocene Surface Exposure Ages from Two Marine-terminating Glaciers in Northwest Greenland by : Melissa M. Reusche

Download or read book Latest Pleistocene and Late Holocene Surface Exposure Ages from Two Marine-terminating Glaciers in Northwest Greenland written by Melissa M. Reusche and published by . This book was released on 2017 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Climate and Vegetation Change During the Late-glacial/early-Holocene Transition Inferred from Multiple Proxy Records from Blacktail Pond, Yellowstone National Park, USA

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Author : Teresa R. Krause
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Climate and Vegetation Change During the Late-glacial/early-Holocene Transition Inferred from Multiple Proxy Records from Blacktail Pond, Yellowstone National Park, USA by : Teresa R. Krause

Download or read book Climate and Vegetation Change During the Late-glacial/early-Holocene Transition Inferred from Multiple Proxy Records from Blacktail Pond, Yellowstone National Park, USA written by Teresa R. Krause and published by . This book was released on 2013 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of environmental changes from late-glacial ice recession through the early Holocene are revealed in a 7000-yr-long record of pollen, charcoal, geochemistry, and stable isotopes from Blacktail Pond, a closed-basin lake in Yellowstone National Park. Prior to 11,500 cal yr BP, cool conditions dominated, fire activity was low, and alpine tundra and Picea parkland grew on the landscape. A step-like climate change to warm summer conditions occurred at 11,500 cal yr BP. In response, fire activity increased facilitating a transition from Picea parkland to closed Pinus forest. From 11,500 to 8280 cal yr BP, warm summers and abundant moisture mostly likely from high winter snowfall supported closed Pinus contorta forests. Cooler drier summer conditions prevailed beginning 8280 cal yr BP due to decreased summer insolation and winter snowpack, and lower parkland developed. The timing of vegetation change in the Blacktail Pond record is similar to other low- and middle-elevation sites in the northern Rocky Mountains during the late-glacial period, suggesting local plant communities responded to regional-scale climate change; however, the timing of vegetation changes was spatially variable during the early and middle Holocene due to the varying influences of strengthened summer monsoons and subtropical high on regional precipitation patterns.

Paleoindians of Yellowstone Lake: Interpreting Late Pleistocene-Early Holocene Hunter-gatherer Land-use in the Greater Yellowstone Ecosystem

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Author : Douglas H. MacDonald
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (13 download)

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Book Synopsis Paleoindians of Yellowstone Lake: Interpreting Late Pleistocene-Early Holocene Hunter-gatherer Land-use in the Greater Yellowstone Ecosystem by : Douglas H. MacDonald

Download or read book Paleoindians of Yellowstone Lake: Interpreting Late Pleistocene-Early Holocene Hunter-gatherer Land-use in the Greater Yellowstone Ecosystem written by Douglas H. MacDonald and published by . This book was released on 2018 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last decade, numerous Paleo-Indian sites have been identified at Yellowstone Lake, Wyoming, North America?s largest, high-elevation natural lake. This study presents results of University of Montana research between 2009 and 2016 at 25 sites that provide information regarding human use of the Greater Yellowstone Ecosystem during the Late Pleistocene-Early Holocene. Despite the recovery of Clovis evidence at Yellowstone Lake, Early Paleoindians rarely visited the region, likely due to difficult post-glacial environmental conditions. After 10,000 BP, upon ameliorating climate changes, Late Paleoindian Cody complex hunter-gatherers increased use of the lake area. In order to better understand regional travel patterns, this study compares lithic raw material and tool use between the Fishing Bridge Peninsula and Osprey Beach Late Paleoindian Cody complex sites. The paper?s conclusion discusses the implications of the research on Paleoindian use of the high-elevation Rocky Mountain region.