80 BIBLIOGRAPHY AND INDEX OF N. 
G70 Turner (H. W.). Notice of Home syenitic rocks from California. 
Am. Geol., vol. xvii, pp. 375-388; Abstract: Mining and Scientific 
Press, vol. lxxiii, p. 237, 1896. 
Discusses the principles of nomenclature of rocks and describes the 
characters and chemical composition of syenitic rocks from different 
jiarts of California. 
077 Tyrrell (J. Burr). The genesis of Lake Agassiz. 
Jour, of Geol., vol. iv., pp. 811-815, 1896. 
Discusses the evidences as to the origin of Lake Agassix, and 
describes glacial phenomena of Manitoba. 
678 Ts the land around Hudson Bay at present rising? 
Am. Jour. Sci., 4th ser., vol. ii, pp. 200-205, 1896. 
Discusses the evidence indicating that the land in this region has 
reached an almost stable condition. 
u. 
679 Udden (J. A.). An account of the Paleozoic rocks explored by- 
deep borings at Bock Island, 111., and vicinity. 
U. S. Geol. Surv., 17th Ann. Rept., Pt. II. In paper by Frank Lev- 
erett on " The Water Resources of Illinois."' 
Describes the stratigraphic features of the Devonian, Silurian, and 
Cambrian rocks of the region. Includes sections of the well drillings. 
080 Upham (Warren). The glacial Lake Agassiz. 
U. S. Geol. Surv., Mon. xxv, 658 pp., 38 pis., 35 figs., 1896. 
Describes the topography of the lake basin, the character and distri- 
bution of the Archean, Silurian, Devonian, and Cretaceous beds under- 
lying the drift, and also of the drift deposits. Discusses the history of 
Lake Agassiz, the formation of the beaches and deltas, and of changes 
of the level of the beaches. Gives an account of the artesian wells of 
the Red River Valley and of the economic features of the region. 
681 Drumlins and marginal moraines of ice sheets. 
Geol. Soc. Am., Bull., vol. vii, pp. 17-30, 1896. 
Refers to the papers in which drumlins in North America are 
described. Discusses the formation of drumlins and marginal moraines 
and the growth and decline of the Pleistocene deposition of drift. 
Compares the present ice action in Alaska and Greenland. 
082 — Pre-Glacial and post-Glacial valleys of the Cuyahoga and 
TCocky rivers [Ohio]. 
Geol. Soc. Am., Bull., vol. vii, pp. 327-348, pi. 15, figs. 1-4, 1896. 
Describes the extent of the pre-Glacial valleys, the post-Glacial 
erosion, the drift sections, the beach ridges in Cleveland and the tem- 
porary readvance of the ice sheet. 
083 Physical conditions of the flow of glaciers. 
Am. Geol., vol. xvii, pp. 16-29, pi. ii, 1896. 
Reviews the theories and discusses the cause of veined or ribboned 
structure in glaciers and of the flow of glacial molecules and grains. 
