Geology and Mineralogy. 473 



during the last Glacial epoch ; post-Glacial erosion is represented 

 by the channels cut in the floor of these deposits since the waters 

 have acquired their present volume. "The Ohio River Valley 

 from New Martinsville to Manchester is of interglacial origin." 



2. Nebraska Geological Survey.- — E. H. Barboue, State Geol- 

 ogist. Volume I, 1903^ 242 pp., 166 figs., 13 pis. — For a num- 

 ber of years geological exploration has been carried on in 

 Nebraska by Professor Barbour, both at private expense and as 

 director of the Morrill Geological Expedition. The State has 

 now made an appropriation for the publication of reports. The 

 present report contains chapters on Hydrography, on Geology 

 including mineral resources, on Soils, and on the Geology of Jef- 

 ferson County. Considerable study has been made of the drain- 

 age conditions and attention is called to the down-stream shifting 

 of the Loup tributaries of the Platte, and to the local artesian 

 and salt water basins. The geological formations represented 

 are : Carboniferous 1200 ft. (8 to 10 inches of coal); PermoCar- 

 boniferous, 200 ft.; Dakota, water-bearing beds, 250 ft.; Benton, 

 200 ft.; Niobrara; Pierre, 100 to 3000 ft.; Oligocene, Bad Lands, 

 600 to 800 ft.; Miocene, Butte Sands, 500 to 600 ft.; Pliocene, 

 200 ft.; Pleistocene, drift and loess. Volcanic dust is found 

 widely distributed over the State. 



3. The Geological Structure of Monzoni and Fassa ; by 

 Maria M. Ogilvie Gordon. Trans. Edinb. Geol. Soc, vol. viii, 

 special pt., pp. 179, with maps, figs, and pis. 1902-3. — The 

 Monzoni region has long been known as a classic field of research 

 in varied branches of geology, and since the publication of 

 Brogger's remarkable memoir (Die Eruptionsfolge der Triadi- 

 schen Eruptivgesteine bei Predazzoin Siid-Tyrol) numerous papers 

 dealing with features of the area and especially with the prob- 

 lems of the igneous rocks have appeared. In some instances 

 these have led to discussions which have become rather acri- 

 monious in character, the varied opinions apparently having 

 arisen from insufficient study of the field relationships. 



All this makes the present work by Mrs. Ogilvie Gordon the 

 more timely as it consists mainly of the results of detailed and 

 patient study and mapping of the field relations, and her conclu- 

 sions, which are not based upon generalities, but upon observed 

 facts, throw a flood of light upon the structure of the area and 

 will prove of service in helping to solve similar problems else- 

 where. The important features of her paper are the location 

 and description of the various folds, and systems of faults, and 

 the relation which the igneous intrusions bear to these fold and 

 fault systems. The intrusions she believes to be of Tertiary age. 



L. V. p. 



4. North American Plesiosajirs ; by S. W. Williston. Pub- 

 lications of Field Columbian Museum. Geological series, vol. ii, 

 No. 1, 77 pp., 29 pis. 



This paper has been presented by the author as part of one of a 

 series of monographic studies on the North American represen- 



