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Bulletin Volume 38; No. 42; Bureau of Economic Geology Publications (Paperback) Loot Price: R614
Discovery Miles 6 140
Bulletin Volume 38; No. 42; Bureau of Economic Geology Publications (Paperback): University of Texas at Austin

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Bulletin Volume 38; No. 42; Bureau of Economic Geology Publications (Paperback)

University of Texas at Austin

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Loot Price R614 Discovery Miles 6 140 | Repayment Terms: R57 pm x 12*

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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. 1912 Excerpt: ...The new genus Orthotetella is without known relative. Orthothetina, a type common in the Permian faunas of LoPing and Djulfa, is represented by a few specimens in the Wolfcamp and the Capitan, the latter reported by Girty. There are 9 species of Meekella, only one of which, M. irregularis texanus, shows foreign affinity, so that this group, like Rhipidomella, may be regarded as largely of American origin. This genus is unrepresented in the Salt Range faunas and is rare in all other Permian faunas but that of the Trogkofel formation and the Schwagerina horizon of Russia. Geyerella, a genus occurring also in the Trogkofel and Sosio limestones, is present in the Hess and the Capitan. Of the 5 species of Derbya, D. crenulata probably evolved from D. crassa of the Pennsylvanian, D. cymbula occurs also in the Pennsylvanian, and D. buchi and D. nasuta are very similar to some Eurasian forms. The genus Orthothetes, which was found by Girty to be rather common in the Capitan, was not identified from the present collection. It is rare above the Mississippian, and present in few Permian faunas. On the whole, the Orthotetinae are more varied than in the Pennsylvanian. They are like the Pennsylvanian forms but with the addition of several foreign elements such as Geyerella and several species of Streptorhynchus. There is about the same number of species as in the Mississippian, but the generic types are quite different, the genera Schuchertella, Schellwienella, and Leptaena, which are important in the Mississippian, being quite absent in the Permian, while Meekella, Geyerella, and Derbya are absent from the Mississippian. The representation of the genus Chonetes is rather diversified, as in most other Permian faunas, 11 species being present. Two of these occur also in ...

General

Imprint: Rarebooksclub.com
Country of origin: United States
Release date: May 2012
First published: May 2012
Authors: University of Texas at Austin
Dimensions: 246 x 189 x 12mm (L x W x T)
Format: Paperback - Trade
Pages: 234
ISBN-13: 978-1-236-40126-7
Categories: Books
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LSN: 1-236-40126-3
Barcode: 9781236401267

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