weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 61 
479 Lee (Harry A.). Report of the State Bureau of Mines for the year 
1897 [Coloradoj. 
Denver, Colo., 167 pp., 1898. 
Describes the character, occurrence, and production in 1897 of the 
economic mineral products of the various counties of Colorado. 
480 Lee (W. T.). [Review of "The Lower Cretaceous Gryphaeas of 
the Texas region," by R. T. Hill and T. W. Vaughau]. 
Jour, of Geol., vol. vi, pp. 758-759, 1898. 
481 Leidy (Joseph). Fossil vertebrates from the Alachua clays of 
Florida. 
Wagner Free Inst, of Sci., Trans., vol. iv, pp. 61, pis. i-xix, 1896. 
Describes the localities and the material obtained. Includes notes 
by F. A. Lucas and W. H. Dall. 
482 Leith (C. K.). Summaries of current North American pre-Cam- 
brian literature. 
Jour, of Geol., vol. vi, pp. 527-541, 739-753, and 840-854, 1898. 
483 Leonard (A. G.). Geology of Dallas County [Iowa]. 
Iowa Geol. Surv., vol. viii, pp. 53-118, pis. iv-vi, tigs. 1-8, and geologic 
map, 1898. 
Describes the physiography, the occurrence and character of the 
Carboniferous and Pleistocene formations, and the occurrence of coal, 
clay, buildiDg stone, road material, and natural gas. 
484 Bain (H. F.) and. The Middle Coal Measures of the west- 
ern interior coal fields. 
See Bain (H. F.) and Leonard (A. G.), No. 45. 
485 Leverett (Frank). The Peorian soil and weathered zone (Toronto 
formation?). 
Jour of Geol., vol. vi, pp. 244-249, 1898. 
Describes the occurrence of the formation and its bearing on the 
evidence of deglaciation within the glacial period. 
486 Correlation of moraines with beaches on the border of Lake 
Erie. 
Am. Geol., vol. xxi, pp. 195-199, 1898. 
Reviews some of the researches on the glacial phenomena of the 
region. 
487 The weathered zone (Sangamon) between the Iowan loess and 
Illinoian till sheet. 
Iowa Acad. Sci., Proc, vol. v, pp. 71-80, pi. iv; Jour, of Geol., vol. vi, 
pp. 171-181 ; Abstract, Am. Geol., vol. xxi, pp. 254-255, 1898. 
Describes the distribution of the loess and till sheet and the charac- 
ter of the Sangamon soil horizon which occurs between them. 
488 The weathered zone (Yarmouth) between the Illinoian and 
Kansas till sheets. 
Iowa Acad. Sci., Proc, vol. v, pp. 81-86; Jour, of Geol., vol. vi, pp. 
238-243; Abstract, Am. Geol., vol. xxi, p. 254 (f p.), 1898. 
Describes the character and occurrence of the Yarmouth zone in 
Iowa. 
