472 Scientific Intelligence. 



pp.) the Southern Atlantic, Eastern Gulf, Eastern Mississippi and 

 Great Lakes Draina2:e ; No. 84 (196 pp.) the Western Mississippi 

 and Western Gulf Drainai^e. 



Bulletins No. 212. Oil fields of the Texas-Louisiana Gulf 

 Coastal Plain ; by C. W. Hayes and William Kennedy. 170 

 pp., 11 pis., 12 figs. The geology of the Gulf coastal plain is 

 described and also the detailed geology of the oil pools of the 

 different districts. The elliptical domes which have furnished 

 the conditions for oil accumulation are of a different class from 

 the anticlines of the Appalachian region and " could scarcely have 

 been produced by horizontal compression." The oil of this dis- 

 trict is "derived, in part at least, from the action of decomposing 

 organic matter, both animal and vegetable, but chiefly the latter, 

 upon gypsum." The "oil ponds" in tlie Gulf water are shown not 

 to be produced by diatoms but 'derived from oil that is either 

 indigenous in the mud or derived from underlying rocks.' 



No. 214. Geographic Tables and Formulas ; by Samuel S. Gan- 

 nett. 284 pp. The tables and formulas used by topographers in 

 the field and the office have been brought together in convenient 

 form. 



No. 215. Catalogue and Index of the Publications of the U. S. 

 Geological Survey 1901 to 1903 ; by Philip C. Waeman. 234 pp. 



No. 216. Primary Triangulation and Primary Traverse, Fiscal 

 year 1902-03 ; by S. S. Gannett. 211 pp., 1 map. 



Pkofessional Paper, No. 15. — The Mineral Resources of the 

 Mount Wrangell District, Alaska ; by W-. C. Mendenhall and 

 F. C. Schrader. 68 pp., 10 pis., 5 tigs. The Mount Wrangell 

 district has important deposits of copper and of gold. The cop- 

 per, chiefly bornite, occurs along the contact between the Niko- 

 lai greenstone (Carboniferous, 4000 ft. thick) and the Chitistone 

 limestone (Permian) and has been concentrated from the green- 

 stones. Gold to the value of $225,000 was mined in the Chesto- 

 china field in 1902. "The region is extensively glaciated but 

 the present glaciers are but insignificant remnants of their prede- 

 cessors," and the surface forms of the ores have been removed. 



Professional Paper, No. 13. — Drainage Modifications in 

 Southeastern Ohio and Adjacent Parts of West Virginia and 

 Kentucky ; by W. G. Tight. 108 pp., 17 pis., 1 fig. Taken in 

 connection with Leverett's monograph on the Erie and Ohio 

 Basins (U. S. G. S. Mon. XLI), Professor Tight's paper gives a 

 detailed account of the interesting drainage modifications of the 

 upper Ohio and its tributaries. A very extensive rearrangement 

 of divides and basins has taken place, the general historj^ of 

 which is outlined as follows: the high level valleys are pre-Glacial ; 

 the deflection of the streams producing the present drainage sys- 

 tem was accomplished by the first advance of the ice sheet (pre- 

 Kansan ?); the extensive erosion of the valleys to depths below 

 present drainage lines was accomplished during a long inter- 

 glacial interval \ these interglacial valleys were partially filled by 

 deposits from flooded streams and afterwards partially recut 



