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 ...
|Country of origin:
University of Texas at Austin
||246 x 189 x 12mm (L x W x T)
||Paperback - Trade
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