222 Scientific Intelligence. 



ancestral to that of tbe Onondaga, and j r et Stauffer doubts 

 " whether that is sufficient reason to place these deposits in the 

 Devonian as that system is now constituted." He states further 

 that " The lowest layers of the Onondaga in Ohio and Ontario are 

 usually a basal conglomerate. The pebbles of this conglomerate 

 are identical in every way with the underlying dolomites of the 

 Detroit River series from which they were unquestionably derived" 

 (285). The break between these two formations is thought to be 

 great, as the Lucas dolomite, which is from 200 to 250 feet thick, 

 is said to have been deposited during a part of this interval. The 

 reviewer does not doubt the evidence of a break between the 

 Oriskany and Onondaga, nor that the Detroit River series (Flat 

 Rock, Anderdon, Amherstburg) is older than the Onondaga, but 

 he is sceptical about it being so old as Oriskany or Helderbergian. 



c. s. 



6. Erosion intervals in the Eocene of the Mississippi Embay- 

 mmtfybyE. W. Berry. Prof. Paper 95-F, U. S. Geol. Surv., 

 1915, pp. 73-82, figs. 27-31. — This important paper should be 

 studied by all stratigraphers, because the author shows that the 

 Eocene of the Mississippi embayment is not an uninterrupted and 

 conformable series, but is in the north at least a four-times-broken 

 and disconformable sequence. c. 8. 



7. Arisaig-Anligonish District, Nova Scotia; by M. Y. 

 Williams. Mem. 60, Geol. Surv. Canada, 1914, pp. 173, 2 maps. 

 — The author here describes and maps in detail the geology, 

 physiography, and economic products of the Arisaig-Antigonish 

 district of Nova Scotia, an area which preserves one of the long- 

 est fossiliferous Silurian sections (3500 feet thick) in North 

 America. The Ordovician, Mississippian, and Pennsylvanian 

 formations are also described. c. s. 



8. The Stratigraphy of the Pennsylvanian Series in Missouri; 

 by Henry Hinds and F. C. Greene, with a chapter on inverte- 

 brate paleontology, by G. H. Girty. Missouri Bureau of Geol- 

 ogy and Mines. Vol. XIII, 2d ser., 1915, pp. 407, 32 pis., 5 text 

 figs., 1 geologic map. — The authors of this report describe the 

 many subdivisions (8 formations with 33 members) of the Penn- 

 sylvanian of Missouri, strata about 1900 feet thick, and their dis- 

 tribution and variation throughout the state (pages 1-255). 

 Compared with the sequence in Pennsylvania, the age of the 

 Missouri strata begins in the upper part of the Pottsville and 

 continues into the lower part of the Monongahela. David White 

 discusses the floras and revises his conclusions published in U. S. 

 Geological Survey Monograph 37 (256-262). The abundant in- 

 vertebrate fauna (350 species) is described by Girty (263-375), 

 who also lists the American species of Productus, 150 in number, 

 and refers 36 of them to Pustula, 7 to Avonia, and 2 to Buxtonia, 

 genera proposed by Thomas in 1914. c. s. 



9. Fossilium Catalogus, I: Animalia, Pars 9, Stegosauria / 

 by E. Hennig. Pp. 16, 1915. Published by W. Junk, Berlin 

 W. 15, price M. 1.50. 



