Scientific Intelligence. 157 



SCIENTIFIC INTELLIGENCE. 



I. Geology. 



1. The Cement Resources of Virginia loest of the lilue Ridge ; 

 by Ray S. Bassler. Bull. No. II-A, Virginia Geological Sur- 

 vey 1909 [1910], pp. X and 309, and 30 plates. — The author has 

 here brought together a great deal of information relating to the 

 limestones and shale formations of the state west of the Blue 

 Ridge. This information has been gleaned from all sources and 

 especially from the extensive travels of the author throughout 

 the state in tracing the various boundaries of the Ordovician 

 formations. Many chemical analyses of the limestones are given. 

 Stratigraphers will find here much new and detailed information 

 regarding the Ordovician, Silurian, and Lower Devonian forma- 

 tions. The guide fossils to the more important cement-bearing 

 formations are illustrated in plates and these will be of great 

 service to the field worker in his age determination of the various 

 deposits. The printing and illustrations are good and the book 

 is above the average of state geological reports. c. s. 



2. Proposed Groups of Pennsylvanian Rocks of Eastern 

 Oklahoma ; by Chas. N. Gould, D. W. Ohbrn and L. L. 

 Hutchison. 'I'he State University of Oklahoma Research Bulle- 

 tin, No. 3. Pp. 15 and 1 map. Norman, 1910. — The Pennsyl- 

 vanian sediments of Oklahoma have a thickness of from 10,000 

 to 12,000 feet, of which at least three-fourths is shale. At definite 

 intervals in these deposits occur limestones known as the Clare- 

 more (Fort Scott), Lenapah, Pawhuska and Wreford. On the 

 basis of the position of these limestones the Pennsylvanian is 

 divided into the Muskogee (9.550 feet thick and coal-bearing), 

 Tulsa (about 1200 feet thick), Sapula (about 1000), and the 

 Ralston (about 800) groups. c. s. 



3. Yorkshire Type Ammonites ; edited by S. S. Buckman. 

 London, 1910 (Wesley & Son). — The Jurassic (Lias and Oolite) 

 ammonites of Yorkshire, inadequately described in the early days 

 of geology by Young and Bird, John Phillips and Martin Simpson, 

 ai"e to be illustrated in this work by excellent photographs made 

 mainly by J. W. Tutcher. Each species appears on independent 

 sheets, as in the Palaeontologia, Universalis, and reproduces the 

 original description and new photographs of the type specimens 

 where these are extant. The editor supplements this informa- 

 tion by additional matter that he has gathered during a lifetime, 

 modernizing each species. There are to be about 200 plates. 



The work is to appear in about 16 parts of about 12 to 16 

 plates each and the edition is to be limited to 250 copies. Each 

 part, post free, costs 3 shillings 6 pence. Two parts have now 

 appeared having 24 plates, heliotype and half-tone, and 22 species 

 descriptions. The work is necessary to all students of ammo- 

 nites. • c. s. 



