abstracts: paleontology 423 



GEOLOGY. — Geology of the Standing Rock and Cheyenne River Indian 

 reservation, North and South Dakota. W. R. Calvert, A. L. 

 Beekly, W. H. Barnett, and Max A. Pishel. U. S. Geological 

 Survey Bulletin 575. Pp. 49, with maps, sections, and illustra- 

 tions. 1914. 

 Aside from the surficial deposits the geologic formations which 

 outcrop in the Standing Rock and Cheyenne River Indian reservations 

 are the Pierre shale and the Fox Hills, of Upper Cretaceous age, the 

 Lance, probably of lower Tertiary age, and the Fort Union formation, 

 definite^ assigned to the last-named epoch. The Fox Hills rest con- 

 formably on the Pierre and no definite line can be drawn between the 

 two formations. There is in most places, however, an abrupt litho- 

 logic change from the Fox Hills to the Lance formation, and locally 

 the contact between the two is marked by a decided unconformity; but 

 it is still an open question whether or not this unconformity represents 

 a long-time break. The surficial deposits consist of scattered striated 

 boulders and small patches of glacial gravel, of early Pleistocene age, 

 and terrace gravel and alluvial valley filling, which were deposited later. 

 The Cretaceous and Tertiary strata dip gently in a northwesterly 

 direction at about 5 feet per mile. M. A. P. 



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PALEONTOLOGY.— Cam6na7i Geology and Paleontology, III, No. l.~- 

 The Cambrian faunas of Eastern Asia. Charles D. Walcott. 

 Smithsonian Miscellaneous Collections 64^: 1-75, pis. 1-3. April 

 22, 1914. 



This paper is essentially a resume of the publications of the Carnegie 

 Institution dealing with the Cambrian formations of Eastern Asia. In 

 condensed and easily accessible form are placed the essential facts in 

 regard to the stratigraphy and paleontology of the Cambrian in this area. 



A historical review of the work on Cambrian geology in Eastern 

 Asia is given. The account of the collections made by the Carnegie 

 Expedition and by Professor Iddings is very full. Numerous sections, 

 faunal lists, and correlation tables are furnished, and the various pre- 

 Cambrian, Cambrian, and Ordovician formations are briefly described. 

 Of special interest is the discussion as to the possible continental origin 

 of the pre-Cambrian sediments, and of the relation of the Cambrian to 

 the Ordovician. A general review of the Lower, Middle, and Upper 

 Cambrian faunas is given, and broad correlations with extra-Asiatic 

 faunas are made. 



A new trilobite genus, Tsinania, is described, having as its genotj-pe 

 Illaenurus canens Walcott. • Edwin Kirk. 



