weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 67 
360(1 Lewis (Henry Carvill). Papers and notes on the Glacial geology 
of Great Britain and Ireland. Edited by ITeury W. Crosskey. 
London: Longmans, Green & Co., 1894. 
Abstracts: Am. Jour. Sci., 3d ser., vol. xlviii, pp. 73-74; Jour, of 
Geol., vol. ii, pp. 747-750, by T. C. Chamberlin. 
301 Lincoln (D. ¥.). The amount of glacial erosion in the Finger 
Lake region of New York. 
Am. Jour. Sci., 3d ser., vol. xlvii, pp. 105-113. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xlii, pp. 177-178. 
Describes the outcrops of Silurian and Devonian strata and the 
topography and glaciated deposits in this region. Discusses the origin 
of the trough-like lake basins and includes a bibliography. 
36-5 Lindgren (Waldemar). Sacramento folio. California. 
U. S. Geol. Surv., Geologic Atlas of the United States, folio 5. 
Describes the geology of the gold belt of California and the occur- 
rence of the auriferous slates, igneous rocks, Tertiary and Pleistecene 
strata, and the gold, copper, and iron deposits of the region. Includes 
topographic, colored areal geologic, economic geologic, and structure 
section maps. 
363 — — The gold-silver mines of Ophir, Oal. 
U. S. Geol. Surv., 14th Ann. Kept., pt. 2, pp. 243-284, pis. xvii-xviii. 
Describes the topographic and geologic features of the region, the 
petrographic characters of the granodiorite, amphibolite, and dike 
rocks, the different vein systems, the mineralogic characters of the 
ores, and the distribution of gold and silver in the veins. Discusses 
the movements along the veins and gives the aiithor's conclusions. 
364 An auriferous conglomerate of Jurassic age from the Sierra 
Nevada. 
Am. Jour. Sci., 3d ser., vol. xlviii, pp. 275-280. 
Describes the lithologic character and the structure of the Mariposa 
and Calaveras formations of Jurassic and Carboniferous age occur- 
ring in Placer County, Cal., and gives a summary of the author's con- 
clusions. 
3G5 and Turner (H. W.). Placerville folio. California. 
U. S. Geol. Surv., Geologic Atlas of the United States, folio 3. 
Describes the general geology of the gold belt of California and the 
occurrence and distribution of the auriferous slates and Neocene gold- 
bearing gravels of the region. Includes topographic, colored areal 
geologic, economic geologic, and structure section maps. 
366 Lonsdale (E. H.). Southern extension of the Cretaceous in Iowa. 
Iowa Acad. Sci., Proc, vol. i, pt. iv, pp. 39-43. 
Mentions some of the exposures of the Cretaceous in Iowa and de- 
scribes the topography of the region in which they occur and the 
removal of j)ortions of these beds by the glacial ice sheet. 
367 Topography of the granite and porphyry region of Missouri. 
Iowa Acad. Sci., Proc, vol. i, pt. iv., pp. 43-48. 
Describes tho topography of the region and its relation to the 
Archean and Cambrian rocks of the region. 
