weeks! PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 29 
177 Cross (Whitman). Outline of geology. (Silverton quadrangle, 
Colorado.) 
IT. S. Geol. Surv., Bull. No. 182, pp. 29-39, 1901. 
Describes the general characteristics of the sedimentary and igneous 
rocks and the structure of the region. 
178 Cummings (Edgar R.). The use of Bedford as a formational 
name. 
Jour. Geol., vol. 9, pp. 232-233, 1901. 
Proposes the name Salem limestone for the Bedford limestone, the 
latter having been preoccupied. 
179 Orthothetes minutus, n. sp. from the Salem limestone of 
Harrodsburg, Indiana, 
Am. Geol., vol. 27, pp. 147-149, pi. 15, 1901. 
180 A section of the upper Ordovician at Vevay, Indiana. 
Am. Geol., vol. 28, pp. 361-380, pis. 34-35, 1901. 
Gives a detailed section, names the fossils found in each bed. and 
compares this section with that at Cincinnati. Describes four new 
species. 
181 Notes on the Ordovician rocks of southern Indiana. 
Ind. Acad. Sci., Proc. for 1900, pp. 200-215, 1901. 
Gives section at various localities with notes on the faunas. 
182 Some developmental stages of Orthothetes minutus n. sp. 
Ind. Acad. Sci., Proc. for 1900, pp. 216-218, 1901. 
183 Currie (P. W.). On the ancient drainage at Niagara Falls. 
Can. Inst., Trans., vol. 7, pp. 7-14, 6 pis., 1901. 
Describes the course of the preglacial river and discusses its mode of 
formation. 
184 Gushing (II. P.). Origin and age of an Adirondack augitc andesite. 
Abstracts: Geol. Soc. Am., Bull., vol. 12, p. 464 (.1 p.), 1901. 
Science, new ser., vol. 13, p. 100, L901. 
Brief description of character and occurrence. 
185 Geology of Rand Hill and vicinity, Clinton County [New 
York]. 
N. Y. State Mus., 53d Ann. Kept., vol. 1, pp. r45-r82, and geologic 
map, 1901. 
Describes the general geologic history of the region, and the pre- 
Cambrian and Paleozoic rocks. 
186 Dall (William II.). The structure of Diamond Head, Oahu. 
Am. Geol., vol. 27, pp. 386-387, L901. 
Refers to the controversy as to the origin of Diamond Hea 
states the author's conclusions. 
187 The morphology of the hinge teeth of bivalves. 
Am. Nat., vol. 35, pp. 175-182, 1901. 
