Shorter Contributions to General Geology, 1917

Shorter Contributions to General Geology, 1917

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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 edition. Excerpt: ...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 mucb 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 diffictdty in identifying and tracing the beds. "LAFAYETTE FORMATION." 1 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. Li 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 described, the formation shows little detailed or consistent relation to altitude, topography, physiography, or geologic features. However, though it rests upon rocks of all ages, from pre-Cambrian to late Tertiary, it is scantily developed in the high country of Paleozoic and older rocks bordering the Coastal Plain. Its surface and base are roughly parallel to the present surface, and it underlies uplands, hillsides, and terraces alike. Other Coastal more

Product details

  • Paperback | 148 pages
  • 189 x 246 x 8mm | 277g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236632168
  • 9781236632166