24 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 146. 
23 Bain (Harry Foster). [Review of the "Preliminary report on the 
geology of South Dakota," by J. E. Todd]. 
Jour, of Geol., vol. iii, pp. 114-115. 
24 Origin of certain features of coal basins. 
Jour, of Geol., vol. iii, pp. 646-654. 
Describes the character of the basins in which the coal of the Iowa- 
Missouri region occurs and discusses the origin of these basins. 
25 Notes on Jowa building stones. 
U. S. Geol. Surv., 16th Ann. Rept,, pt. iv, pp. 500-503. 
Notes on the character and distribution of building stones in Iowa, 
contained in a paper on " Stone," by William C. Day. 
26 Todd (J. E.) and. Interloessial till near Sioux City, Iowa. 
Iowa Acad. Sci., Proc, vol. ii, pp. 20-23, pi. 1. 
See Todd (J. E.) and Bain (H. F.), No. 474. 
27 Barbour (Erwin Hinckley). Is Dremonelix a burrow? A reply 
to Dr. Theodor Fuchs. 
Am. Nat., vol. xxix, pp. 517-527. 
Describes the character of the Miocene bad lands of the United 
States and reviews the evidences which have been said to indicate that 
these Miocene beds are of aerial origin and Dsemonelix a rodent. 
28 Barlow (Alfred E.). On some dikes containing "huronite." 
Ottawa Nat., vol. ix, pp. 25-47. 
Reviews the literature on huronite and describes the petrographic 
character of rocks from various parts of Canada and from Minnesota 
containing huronite. 
29 Barnard (H. M.). The zoological position of triiobites. 
Sci. Am. Suppl., vol. xl, pp. 16533-16534 and 16549-16550. 
Describes the characters of triiobites and discusses their zoological 
position. 
30 Barton (George H.). Glacial origin of channels on druinlins. 
Geol. Soc. Am., Bull., vol. vi, pp. 8-13. 
Describes the characteristics of Glacial and pre-Glacial erosion of 
drumlins and discusses the origin of channels on certain drumlins in 
Massachusetts. 
31 Bather (F. A.). Brachiocrinus and Herpetocrinus. 
Am. Geol., vol. xvi, pp. 213-217. 
Discusses the reasons for considering that the fragments described as 
Brachiocrinus belong to the genus Herpetocrinus. 
32 Bayley (W. S.). The basic massive rocks of the Lake Superior 
region, iv. The peripheral phases of the great gabbro mass 
in northeastern Minnesota. 
Jour, of Geol. vol. iii, pp. 1-20. 
Describes the olivinitic, hypersthenic, diallagic, biotitic, hornblendic, 
and nonfeldspathic varieties of the granulitic gabbros. Gives the 
author's conclusions and a preliminary geologic map of the vicinity of 
Akeley Lake, Minnesota. 
