508 Scientific Intelligence. 



No. 499. Coal Near the Black Hills, Wyoming-South 

 Dakota ; by R. W. Stone. Pp. 66 ; 7 plates, 8 figures. 



No. 500. Geology and Coal Fields of the Lower Matanuska 

 Valley, Alaska ; by G. C. Martin and F. J. Katz. Pp. 98 ; 19 

 plates, 12 figures. 



No. 504. The Sitka Mining District, Alaska; by Adolph 

 Knopf. Pp. 32 ; 1 plate, 4 figures. 



No. 505. Mining Laws of Australia and New Zealand ; by 

 Arthur C. Veatch with a preface by Walter L. Fisher. Pp. 

 180. 



No. 511. Alunite: a newly discovered deposit near Marysvale, 

 Utah ; by B. S. Butler and H. S. Gale. Pp. 64 ; 3 plates. 

 This new locality for alunite gives promise of affording a consid- 

 erable amount of the potash so much needed in this country. 



Water-Supply Papers. — No. 280. Gaging Stations maintained 

 by the U. S. Geological Survey, 1888-1910, and Survey Publica- 

 tions relating to Water Resources; compiled by B. D. Wood. 

 Pp. 102. 



Nos. 282, 286, 287. Surface Water Supply of the United 

 States, 1910 ; prepared under the direction of M. O. Leighton. 

 No. 282. Part II. South Atlantic Coast and Eastern Gulf of 

 Mexico; by M. R. Hall and J. G. Mathers. Pp. 109; 3 plates. 

 No. 286. Part VI. Missouri River Basin ; by W. A. Lamb, W. 

 B. Freeman, Raymond Richards, and R. C. Rice. Pp. vii, 308; 

 4 plates, 1 figure. No. 287. Part VII. Lower Mississippi Basin; 

 by W. B. Freeman and J. G. Mathers. Pp. 91; 2 plates. 



2. Cambro-Ordovician Boundary in British Columbia loith 

 description of fossils ; by Charles D. Walcott. Smithsonian 

 Misc. Col., 57, No. 7, pp*. 229-237, pi. 35, 1912. — Until now the 

 boundary between the Cambrian and Ordovician of America has 

 not been clearly established on paleontologic evidence. Due to 

 the discovery of fossils b} 7 " J. A. Allan of the Geological Survey 

 of Canada, and later by L. D. Burling, Walcott is now able to 

 indicate this division with certainty for the Rocky Mountain 

 region. Some time ago he placed the line at the top of the Sher- 

 brooke formation which has in its upper beds Lingulella isse and 

 a Ptychoparia, fossils indicating the Upper Cambrian. This 

 formation is now known to be followed by the Chancellor, about 

 2500 feet thick, then the Ottertail blue limestone with a thickness 

 of 1550+ feet. The latter yields Lingulella cf. isse, Agnostus, 

 and Ptychoparia, fossils indicating Cambrian time. 



Above the Ottertail formation appear interbedded cherts, cherty 

 limestones, dolomitic limestones and siliceous and calcareous 

 slates and shales over 6000 feet in thickness, referred to the 

 Goodsir formation. In the lower part Allan found the new 

 species here described by Walcott as Obolus mollisonensis, Lin- 

 gulella/ allani, L. moosensis and Ceratopyge canadensis. 



"The discovery of fairly well characterized specimens of the 

 trilobitic genus Ceratopyge associated with brachiopods of the 

 same general type as those found in the Ceratopyge shale of 



