328 Reviews — G. P. MerriU's History of American Geology. 



IV. — United States Geological Survey (Bulletin No. 266, 

 Series C, Systematic Geology and Paljeoiitology). Charles D. 

 Walcott, Director. Pal^sontology of the Malonk Jurassic 

 Formation of Texas. By Francis Whittkmork Craqin. 

 With Stratigrapbical Notes on Malone Mountain and the 

 surrounding Region near Sierra Blanca, Texas. By T. W, 

 Stanton, pp. 1-109, plates i-xxix. 8vo. Washington, 1905. 



IN the introductory portion of this paper Mr. Cragiii describes the 

 geology of the region, with remarks on the fossils and related 

 faunas. This is followed bj' a stratigrapbical sketch by T. W. 

 Stanton, accompanied by a map, showing the Sierra Blanca and 

 other mountain chains with their contour-lines. The rest is taken 

 up with a description of the species of fossils. 



After describing the topographical features of the region, an 

 account of its geology is given, in which it is stated that all the 

 fossils were obtained from Malone Mountain and the neighbouring 

 hills — the Malone hills. These hills extend, trending at first 

 eastward and then southward as a practically continuous Jurassic 

 outcrop through the Neocene, for a distance of a mile and a half. 



The Malone formation was found to be extremely rich in fossils, 

 as the long lists clearly testify. They include a new t^pecies of 

 Astroccsnia (-i. Jlaloniana), two echinoids, Holectypus and Pi/gurus, 

 many molluscs, a serpula, and the fin spine of a selachian of an 

 indeterminate genus. 



The affinities of its fauna clearly refer the Malone formation to 

 the Jurassic. The sections Undulatte and Costataj, to which several 

 of the Malone Trigonias belong, are exclusively Jurassic. With one 

 exception, represented by a single somewhat imperfect mould, none 

 of them agrees perfectly' with generic groups hitherto known from 

 Cretaceous rocks exclusively. This evidence of the age of the rocks 

 is further strengthened by that afforded by the Ammonites, the 

 genus of most frequent occurrence being Perisphinctes, the species 

 of which show the closest affinities with those of the Tithonian of 

 Europe. 



It is observed that a considerable number of the fossils of the 

 Malone formation are identical with some of those of the Alamitos 

 beds, described by Castillo and Aguilera in San Luis Potosi. Mexico, 

 and there can be little doubt that the Malone and Alamitos beds 

 represent approximately the same horizon. 



Twenty excellent plates and a serviceable index complete this 

 interesting monograph on Jurassic fossils. A. H. F. 



V. — Contributions to the History of American Geology. By 

 George P. Merrill, Head Curator of Geology, U.S. National 

 Museum. From the Report of the United States National 

 Museum for 1904, pp. 189-734, with 37 plates and 141 text- 

 figures. 8vo. Washington, 1906. 



rpHIS i*ecord of the birth and growth of geology in the United 

 JL States and Canada, written by one of the most able and 



