Maps Illustrating The Isthmus Of Tehuantepec Classic Reprint

Author : John Jay Williams
Publisher : Theclassics.Us
ISBN 13 : 9781230278506
Total Pages : 102 pages
Book Rating : 4.2/5 (785 download)

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Download or read book The Isthmus of Tehuantepec. [with] Maps written by John Jay Williams and published by Theclassics.Us. This book was released on 2013-09 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1852 edition. Excerpt: ... San Juan Guichicovi, iron ore abounds. Between these hills and the Malatengo River, after it has taken its easterly course, the compact limestone, described previously, crops out upon the surface in several places along the line of survey. Between the Malatengo and the Sarabia, and between the latter and the Jaltepec, the surface is less disturbed: granular quartz, or quartz-breccia, sandstone, and porphyritic greenstone and sandstone are the underlying rocks. None of these upheavals reach the height of the hills more to the south. While the direction of the elevating force was the same, its intensity was less. The real inequality of the surface is diminished by the accumulation of quartzose gravel and gravelly clay, which here occupy the whole surface of the level ground. Five miles south of the Jaltepec the compact limestone appears as the surface rock. Here it overlays coarse conglomerate, consisting of hornstone united by a calcareous cement. The limestone forms the crest of an elevated ridge dividing the waters of the Jaltepec and Jumuapa. It has a porous structure, but is rather hard. It is covered by a mass of weathered fragments, which, when removed, show the rock to have a dip of a very small angle to the north. The strata are nearly horizontal. North of the Naranjo River about seven miles, a range of hills 800 feet high, chiefly composed of sandstone conglomerate with a calcareous cement, approaches the river Coatzacoalcos from the west. The dip is southward, with a more easterly strike than the other formations. Above Suchil this conglomerate is met with, the strata dipping at almost every angle. On the eastern side of the Island of Tacamichapa the compact limestone crops out on the river's edge and forms bold cliffs: here it...