REVIEWS 
The Guadalupian Fauna. By Grorce H. Girty. Professional 
Paper 58, U. S. Geological Survey. Pp. 651, 31 plates. 1909." 
The appearance of this work, which, according to Dr. Girty, has been in 
the form of page-proof nearly a year and a half, marks an epoch in the 
production of fine monographic reports on the upper Paleozoic faunas of 
America. The subject-matter is no less interesting and important than 
the quality of the workmanship on the book. It brings to light the most 
unique and one of the most important faunas known from the American 
Anthracolitic rocks, and one which must be reckoned with in any broad 
correlation of horizons above the Mississippian. It represents an immense 
amount of careful work and painstaking discrimination on the part of 
the author. 
This fauna was first discovered by G. G. Shumard in 1858, and was 
described by his brother, B. F. Shumard, in 1859. Since that time it has 
remained unnoticed until the appearance of the present elaborate report, 
save a couple of preliminary papers by Dr. Girty. All told there are 326 
species and varieties. Of these, over 180 forms are defined and illustrated 
as new, over a hundred undesignated; the remainder are previously 
described species. 
In the introduction the stratigraphy is passed rather briefly; 51 pages 
are devoted to it and the correlation, the remainder being given to the 
systematic paleontology. 
The stratigraphic relationships of these Permian beds are peculiar and 
interesting. They are brought to the surface by a westward-facing fault- 
scarp as it dies out into a fold to the south. Other mountains occur to the 
west and northwest with older faunas, and only in this one locality is the 
nearly full section of the Guadalupian rocks shown. The Capitan lime- 
stone (white Permian limestone of Shumard) is 1,700 or 1,800 feet in 
thickness. Below this is the Delaware Mountain formation composed of 
dark limestones and sandstones with a black limestone 200+ feet thick 
t The cover and title-page bear the date 1908. However the book was not distrib- 
uted until about February, r90g. Ordinarily this close discrimination of dates would 
be unnecessary, but since something over 180 new species, nine or ten new genera, 
and three new families of a rather cosmopolitan fauna are named and defined it is 
important that the date on the title-page should be correct. 
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