4.8 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
219 Gorby (S. S.). [Natural resources of ludiaua.J 
Ind. Dept. Geol. and Nat. Res., 18th Rept., pp. 9-16. 
Reviews the developments in the coal, building stone, clays, gas, and 
petroleum industries of Indiana in 1893. 
220 G-rabau (Amadeus W.). The pre-Glacial chauuel of the Genesee 
Kiver. 
Bost. Soc. Nat. Hist., Proc, vol. xxvi, pp. 359-369. 
Abstract: Am. Geol., vol. xiv, pp. 397-398 (£p.). 
Describes the modern channel of the river, the topography of the 
adjacent region, the relations of the Genesee and Wyoming valleys 
and the Dansville-Rochester Valley, and gives a summary of conclu- 
sions. 
221 Grant (Uly S.). The State of Minnesota. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 302-311. 
Describes the topography, the outcrops of Archean and Algonkian, 
Cambrian, and Silurian formations, and the glacial deposits of the por- 
tion of the State crossed by the excursion. 
222 La Crosse to Minneapolis and Minneapolis to Moorhead. 
Itinerary. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 312-317. 
Describes the local geology along the route traversed by the excur- 
sion of the International Congress of Geologists. 
223 The geology of Kekequabic Lake, in northeastern Minnesota, 
with special reference to an augite soda-granite. 
Minn. Geol. and Nat. Hist. Surv., 21st Ann. Rept., pp. 9-58, pis. i-ii, 
figs. 1-4. 
Describes the topography and reviews the previous literature on the 
region. Describes the ancient clastic and igneous rocks and the field 
relations and petrographic characters of the granite. 
221 Preliminary report of field work during 1893 in northeastern 
Minnesota. 
Minn. Geol. and Nat. Hist. Surv., 22d Ann. Rept., pp. 67-78. 
Describes the topography and the lithologic character and structure 
of the Animikc and Keweenawan beds of the region. 
225 Volcanic rocks in the Keewatin of Minnesota. 
Science, vol. xxiii, p. 17. 
Describes the petrographic characteristics of some volcanic rocks 
occurring in Keewatin strata. 
220 Note on the Keweenawan rocks of Grand Portage Island, 
north coast of Lake Superior. 
Am. Geol., vol. xiii, pp. 437-439. 
Describes the sedimentary and igneous rocks of this island and con- 
siders that the former belong to the lower part of the Keweenawan. 
227 Gresley (W. S.). Cone-in-cone: how it occurs in the Devonian 
series in Pennsylvania, United States of America, with 
further details of its structure. 
Geol. Soc. London, Quart. Jour., vol. 1, pp. 731-739, pis. xxxv-xxxvi. 
Abstract: Am. Geol., vol, xiv, pp. 399-400 (£ p.). 
Describes the occurrence of cone-in-cone structure in Devonian beds 
of Pennsylvania. 
