The Eocene deposits of the Middle Atlantic slope in Delaware, Maryland, and Virginia - Softcover
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. 1896 Excerpt: ... of Ostrea The Severn Eiver section is composed of highly weathered beds, of a deep-brown color, in which iron crusts are common. The strata cap the high bluffs which extend almost continuously from Eound Bay to the mouth of the river at Annapolis. Cucullœa gigantea, Ostrea compressirostra, Cytherea ovata, Turritella mortoni, Venericardia planicosta, Dosiniopsis lenticularis, and other forms occur. The Patuxent and its tributaries cut deeply into the Eocene deposits. The section at Upper Marlboro is particularly noteworthy on account of the highly fossiliferous character of the strata, and has been frequently referred to in geological literature. Section at Uiper Marlboro, Maryland. Feet. 1. Keddish gravelly loam 18 2. Fino loose sand of light-yellow color....' 20 3. Dark-gray, greensand, slightly argillaceous, with few ferruginous crusts, yel low mottled in places 55 4. Brownish sands with casts-of Turritella mortoni 3 5. Greenish-gray marl with Venericardia 2)lanicostaand other forms 2 6. Indurated layer of light greenish-gray sand filled with Turritella mortoni, Cucullœa gigantea, Gytherea ovata, Dosiniopsis lenticularis, Pectunculus idoneus Venericardia planicosta, Calyptrophorus jacksoni, Astarte marylandica, Ostrea compressirostra, and other forms 8 7. Loose, greenish, ash-colored sands containing many of the same species as the overlying bed 10 116 Along the tributaries entering the Potomac Eiver on the western side of Charles County, Md., several extensive outcrops are found. Among them the section at Fort Washington is the most important and best known. Section in ravine north of Fort Washington, Maryland. Feet. 1. Red loam with gravel and sand at base 25 2. Brownish weathered greensand 20 3. Firm, dark greensand-. 4 4. Dark greensand den...
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- PublisherRarebooksclub.com
- Publication date2012
- ISBN 10 1236004612
- ISBN 13 9781236004611
- BindingPaperback
- Number of pages48
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