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Ammonites From The Upper Cretaceous Of West Greenland
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Book Synopsis Ammonites from the Upper Cretaceous of West Greenland by : Tove Birkelund
Download or read book Ammonites from the Upper Cretaceous of West Greenland written by Tove Birkelund and published by . This book was released on 1965 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ammonites from the upper cretaceous of West Greenland by :
Download or read book Ammonites from the upper cretaceous of West Greenland written by and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ammonites from the Upper Cretaceous of West Greenland, Etc. [With a Map.]. by : Tove BIRKELUND
Download or read book Ammonites from the Upper Cretaceous of West Greenland, Etc. [With a Map.]. written by Tove BIRKELUND and published by . This book was released on 1965 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ammonites from the Upper Cretaceous of West Greenland by : Tove Birkelund
Download or read book Ammonites from the Upper Cretaceous of West Greenland written by Tove Birkelund and published by . This book was released on 1965 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ammonites from thr upper cretaceous of West Greenland by : Tove Birkelund
Download or read book Ammonites from thr upper cretaceous of West Greenland written by Tove Birkelund and published by . This book was released on 1965 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Ammonites from the Campanian (Upper Cretaceous) of Northern Hokkaido by : Tatsurō Matsumoto
Download or read book Some Ammonites from the Campanian (Upper Cretaceous) of Northern Hokkaido written by Tatsurō Matsumoto and published by . This book was released on 1984 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Late Cretaceous Ammonites Scaphites Leei Reeside and Scaphites Hippocrepis (DeKay) in the Western Interior of the United States by : William Aubrey Cobban
Download or read book The Late Cretaceous Ammonites Scaphites Leei Reeside and Scaphites Hippocrepis (DeKay) in the Western Interior of the United States written by William Aubrey Cobban and published by . This book was released on 1969 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Additional title page description: Three chronological forms each of Scaphites leei and Scaphites hippocrepis occur in dimorphic pairs and provide a means of correlating thin units of strata.
Book Synopsis LATE CRETACEOUS (CENOMANIAN-CAMPANIAN) AMMONITE SYSTEMATIC PALEONTOLOGY AND BIOSTRATIGRAPHY, SOUTHEASTERN SAN JUAN BASIN, SANDOVAL COUNTY, NEW MEXICO by : PAUL L. SEALEY
Download or read book LATE CRETACEOUS (CENOMANIAN-CAMPANIAN) AMMONITE SYSTEMATIC PALEONTOLOGY AND BIOSTRATIGRAPHY, SOUTHEASTERN SAN JUAN BASIN, SANDOVAL COUNTY, NEW MEXICO written by PAUL L. SEALEY and published by New Mexico Museum of Natural History and Science. This book was released on with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Upper Cretaceous Dimorphic Pachydiscid Ammonite Menuites in the Western Interior of the United States by : William Aubrey Cobban
Download or read book The Upper Cretaceous Dimorphic Pachydiscid Ammonite Menuites in the Western Interior of the United States written by William Aubrey Cobban and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Descriptions and illustrations of two important species of Menuites.
Book Synopsis U.S. Geological Survey Professional Paper by :
Download or read book U.S. Geological Survey Professional Paper written by and published by . This book was released on 1973 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geological Survey Professional Paper by :
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1982 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ontogeny of Upper Cretaceous (Turonian-Santonian) Scaphitid Ammonites from the Western Interior of North America by : Neil H. Landman
Download or read book Ontogeny of Upper Cretaceous (Turonian-Santonian) Scaphitid Ammonites from the Western Interior of North America written by Neil H. Landman and published by . This book was released on 1987 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Scaphites are a group of late Cretaceous heteromorphic ammonites in which the final body chamber partially uncoils, thereby marking the attainment of the adult stage. This distinctive change in shape permits unequivocal separation of variation due to developmental stage from phenotypic variation among adults. In the Western Interior of North America, scaphites are represented by a wide diversity of endemic species. Many of these species are abundant and well preserved and, therefore, are especially suitable for a detailed investigation of ontogenetic development. I studied the ontogeny of several species of Turonian-Santonian scaphites in the genera Scaphites, Clioscaphites and Pteroscaphites, utilizing both whole fossils and polished sections. The study of their ontogeny bears on the questions of scaphite systematics and morphological development, and ammonite life history in general. The initial whorls of scaphites, as in other ammonites, consist of a bulbous protoconch and part of a planispiral whorl (referred to as the ammonitella). The ammonitella displays a uniform tuberculate micro-ornamentation extending 0.75 whorls to a depression (primary constriction) after which growth lines appear. The shell wall is prismatic in microstructure and nacre first appears at the constriction where it forms an internal pad (primary varix). These morphological observations support a scheme of direct development in which the constriction marks the aperture of the embryonic shell. Preserved ammonitellas of Scaphites ferronensis and Baculites cf. B. asper, B. codyensis suggest that hatching may have occurred after the development of the Proseptum. In scaphites, the proseptum displays a unique necklike attachment that appears as a superimposed saddle on the prosuture. The caecum and its prosiphonal attachment are similar among all the species studied. The diameter of the embryonic shell averages 700 [micrometers] and ranges from approximately 600 to 800 [micrometers]. The ammonitella angle averages 270ð, which is similar to the angular length of the juvenile body chamber. Unlike modern Nautilus, the embryonic shell is comparable in size to the young of many Recent dibranchiate cephalopods and may have followed a planktonic mode of life immediately after hatching. The juvenile shell conforms to a logarithmic spiral but exhibits a conspicuous change in morphology at approximately 3-4 mm diameter corresponding to two whorls from the primary constriction. The change involves modifications in the growth patterns of the umbilical diameter and spiral radius and coincides with the first appearance of macro-ornamentation. It also corresponds to a minimum in septal spacing and the attainment of a stable, ventral position of the siphuncle. These changes may indicate a transition from a passive planktonic to a more active mode of life. Similar morphometric changes occur in many other ammonites at this approximate size and whorl number and may represent a common developmental pattern. In micromorph scaphites of the genus Pteroscaphites, this whorl size coincides with the initiation of an accelerated maturity. As in modern Nautilus, the period of septal secretion in scaphites and other ammonites was probably dependent on the rate of apertural growth and buoyancy requirements rather than external astronomical rhythms. The period may also have displayed an increase over ontogeny, although the absolute rate of growth is unknown. Maturity is expressed by the development of an uncoiled body chamber, although the degree of uncoiling varies widely among species. Interspecific comparisons are therefore facilitated by examination of the more similarly shaped phragmocones. Within species, histograms of adult phragmocone diameter form unimodal distributions although a well-marked sexual dimorphism appears in many species. The ratio of maximum to minimum phragmocone diameter ranges from 1.7 in S. preventricosus to 4.6 in S. carlilensis. The diameter of the adult phragmocone and the number of postembryonic whorls exhibit a positive correlation within and among species. The adult size and the extent to which the mature body chamber uncoils also covary within and among species. Evolutionary changes in size, with concomitant changes in the timing of sexual maturation, may thus explain interspecific variation in the degree of mature uncoiling"--Page 119
Book Synopsis Ammmonites from the upper Cretaceous of West Greenland by : Tove Birkelund
Download or read book Ammmonites from the upper Cretaceous of West Greenland written by Tove Birkelund and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Upper Cretaceous Dinoflagellate Cyst Stratigraphy, Onshore West Greenland by : Henrik Nøhr-Hansen
Download or read book Upper Cretaceous Dinoflagellate Cyst Stratigraphy, Onshore West Greenland written by Henrik Nøhr-Hansen and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Red Bird Section of the Upper Cretaceous Pierre Shale in Wyoming by : James Rogers Gill
Download or read book The Red Bird Section of the Upper Cretaceous Pierre Shale in Wyoming written by James Rogers Gill and published by . This book was released on 1966 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Description, environmental interpretation, and correlation of a 3,100-foot-thick sequence of marine shale.
Book Synopsis Geological Survey Professional Paper by : Geological Survey (U.S.)
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1974 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ammonoid Paleobiology: From macroevolution to paleogeography by : Christian Klug
Download or read book Ammonoid Paleobiology: From macroevolution to paleogeography written by Christian Klug and published by Springer. This book was released on 2015-07-22 with total page 615 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume work is a testament to the abiding interest and human fascination with ammonites. We offer a new model to explain the morphogenesis of septa and the shell, we explore their habitats by the content of stable isotopes in their shells, we discuss the origin and later evolution of this important clade, and we deliver hypotheses on its demise. The Ammonoidea produced a great number of species that can be used in biostratigraphy and possibly, this is the macrofossil group, which has been used the most for that purpose. Nevertheless, many aspects of their anatomy, mode of life, development or paleobiogeographic distribution are still poorly known. Themes treated are biostratigraphy, paleoecology, paleoenvironment, paleobiogeography, evolution, phylogeny, and ontogeny. Advances such as an explosion of new information about ammonites, new technologies such as isotopic analysis, tomography and virtual paleontology in general, as well as continuous discovery of new fossil finds have given us the opportunity to present a comprehensive and timely "state of the art" compilation. Moreover, it also points the way for future studies to further enhance our understanding of this endlessly fascinating group of organisms.