28 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [buLl.146. 
62 Bryson (John). The ups and downs of Long Island [New York]. 
Am. Geol., vol. xv, pp. 188-192 (correspondence). 
Discusses the evidences which indicate the influence of the ice sheet 
in the formation of the coast line and the moraines and beaches of Long 
Island. 
63 Bock Hill, Long Island, N. Y. 
Am. Geol., vol. xvi, pp. 228-233, pi. xii. 
Describes the occurrence of bowlders and other glacial phenomena 
on Long Island. 
64 Buell (Ira M.). Bowlder trains from the outcrops of the Waterloo 
quartzite area [Wisconsin]. 
Wis. Acad. Sci. Arts and Letters, Trans., vol. x, pp. 485-509, pis. 
xii-xvi. 
Describes the geology of the quartzite area, the evidence of glacial 
distribution, and the character and distribution of the bowlder trains 
in the reedon, in southern Wisconsin. 
65 Calvin (Samuel). Composition and origin of Iowa chalk. 
Iowa Geol. Surv., vol. iii, 2d Ann. Rept., pp. 213-236, pi. xix. 
Compares the chalk formations of Europe and North America, reviews 
the literature on the latter deposits, and describes and figures some of 
the Foraminifera which make up the chalk beds. 
GCj Geology of Allamakee County [Iowa]. 
Iowa Geol. Surv., vol. iv, 3d Ann. Rept., pp. 39-120, figs. 1-12, and a 
geologic map. 
Describes the physiography and drainage of the region and the strati- 
graphic and lithologic features of the Cambrian and Lower Silurian 
formations. Describes the occurrence of building stones, lime, clay, 
iron, mineral paint, lead, and zinc. 
67 Maquoketa shales in Delaware County [Iowa]. 
Abstract : Iowa Acad. Sci., Proc, vol. ii, pp. 40-42. 
Describes the character and occurrence of these beds, and gives a list 
of the fossils collected. 
68 The Niobrara chalk. 
Am. Assoc. Adv. Sci., Proc, vol. xliii, pp. 197-217. 
Describes the areal distribution, physical characteristics and stratig- 
raphy of the Niobrara formation. Reviews the literature on the chalky 
character and Foraminiferal origin of the Niobrara strata. Describes 
the distribution of the Foraminifera, and compares the Niobrara and 
English chalk formations. 
69 Case (E. C). On the mud and sand dikes of the White River Mio- 
cene. 
Am. Geol., vol. xv, pp. 248-254. 
Reviews the descriptions of dikes of this character in California, 
Nebraska, and South Dakota, and discusses the evidences which indi- 
cate that they occupy preexisting cracks in the associated strata. 
