Professional Paper - United States Geological Survey Volume 108 by Geological Survey
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Author: Geological Survey
Number of Pages: 136 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: eBook
ISBN: 9781130280944
Download Link: Professional Paper - United States Geological Survey Volume 108
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...character. Many of the individual pre-Pliocene strata are not persistent and hence can not be correlated by continuous tracing over wide Figure 21.--Diagram showing general nature and areal arrangement of materials underlying the surfldal deposits ol Mississippi. tions, concerning whose general positions and areas of outcrop there can be no doubt, notwithstanding the fact that there is a lack of agreement as to whether the most accessible strata in the region--those immediately underlying the surface and abundantly exposed in cuts and washes--belong with the underlying strata or constitute, as has been thought for many years, a distinct surficial formation. In the opinion of the writer and others much if not most of the material in central and northern Mississippi which has been called Lafayette or Orange sand belongs in fact with the underlying formations and differs from them only in being on the whole more reddened and otherwise weathered. The very fact, however, that such an idea, though tenable, has been so slow in arising is expressive of the difficulty in identifying and tracing the beds. "LAFAYETTE FORMATION."' GENERAL NATURE. The "Lafayette formation" as heretofore described 2 is a late Pliocene or early Pleistocene mantle deposit which crops out throughout most of the Coastal Plain of eastern North America and some adjoining territory, an area of more than 200,000 square miles. It consists largely of more or less deeply ironstained gravel, sand, clay, and loam, the upper part generally massive and the lower stratified.. In thickness it ranges from 1 foot to 200 feet or more. Fossils are generally rare, and those that have been found are regarded as out of place and range in age from Devonian to Pleistocene, inclusive. As descri...
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