weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 27 
48 Calvin (Samuel). The Niobrara chalk. 
Am. Geol., vol. xiv, pp. 140-161. 
Abstract: Jour, of Geol., vol. ii, pp. 755-756. 
Describes tbe distribution and physical characters of the formation. 
Refers to the literature describing these beds and compares them with 
the chalk formation of England. 
49 Campbell (Marius R.). E still ville folio. Virginia, Kentucky, Ten- 
nessee. 
U. S. Geol. Surv., Geologic Atlas of the United States, folio 12. 
Describes the physiography and drainage of the region, the char- 
acter and occurrence of the Cambrian, Cambro-Silurian, Silurian, 
Devonian, and Carboniferous strata, and the geologic structure and 
the coal deposits included in the area of the sheet. Gives the section 
of several coal outcrops and a table of coal analyses. Includes topo- 
graphic, colored areal geologic, economic geologic, and structure sec- 
tion maps and a sheet of columnar sections. 
50 Paleozoic overlaps in Montgomery and Pulaski counties, Vir- 
ginia. 
Geol. Soc. Am., Bull., vol. v, pp. 171-190, pi. 4. 
Abstract: Am. Geol., vol. xiii, pp. 147-148 (f p.). 
Describes the physical features and the stratigraphy of the Cambrian, 
Silurian, Devonian, and Carboniferous formations, and discusses the 
geologic structure of the region. 
51 Tertiary changes in the drainage of southwestern Virginia. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 21-29, with map. 
Describes the changes that have occurred in the drainage of this 
region and discusses the evidences indicating that they were caused by 
local erogenic rather than by epeirogenic movements. 
51a Geology of the Big Stone Gap coal field of Virginia and Ken- 
tucky. 
Abstract: Am. Geol., vol. xiv, pp. 392-393. 
Noticed in Bibliography and Index for 1892 and 1893. 
517> Hayes (G. W.) and. Geomorphology of the Southern Appa- 
lachians. 
Nat. Geog. Mag., vol. vi, pp. 63-126, pis. 4-6. 
See Hayes (C. W.) and Campbell (M. R.), No. 264. 
51c? Canada, Geological Survey. Annual Report for 1890-91, vol. v. 
Abstracts: Am. Geol., vol. xiii, pp. 429-431; Am. Nat., vol. xxviii, 
p. 336 (7 1). 
Noticed in Bibliography and Index for 1892 and 1893. 
52 Case (E. G.). A geological reeonnoissance in southwest Kansas and 
No Man's Land. 
Eans. Univ. Quart., vol. ii, pp. 143-147. 
Gives a brief description of the Triassic deposits of this region. 
53 Traces of a glacier at Kansas Gity, Mo. 
Eans. Univ. Quart., vol. ii, pp. 149-150. 
Brief description of the evidences which indicate the former exist- 
ence of a glacier in this vicinity. 
