45^ STUDIES FOR STUDENTS 



lava flows. These are probably iooo feet or more in thickness and 

 extend over a considerable area between the El Paso range and 



the Sierra Nevadas They are finely exposed in Red Rock 



canyon and about Black Mountain The beds are tilted 



northward at an angle of 15-20 degrees Impressions of 



leaves occur in the clay immediately above the seam of coal. 

 These were submitted to Dr. F. H. Knowlton who says : 'I have 

 looked over the three small fragments of fossil plants from the 

 Mojave desert with the following result : Two species are repre- 

 sented, Spindus affinis Newb., and Anemia subcretacea (Sap.) Ett. 



and Gard The plants indicate a Tertiary age without 



doubt, and they seem to belong to the Eocene. Both species 

 have quite a wide distribution geographically and are confined, 

 with several unimportant exceptions, to the Eocene.'" 1 



EOCENE OF BATES HOLE, WYOMING 



In the valley of Bates Creek, Natron county, Wyo., fossilif- 

 erous Eocene beds occur. They have been but recently recog- 

 nized and no published account of them is known to the writer. 



THE KENAI FORMATION 



The coal bearing beds typically seen on Kenai peninsula, 

 Cook Inlet, Alaska, "but widely spread in British Columbia and 

 over the coast of Alaska and its adjacent islands" are called by 

 Dall and Harris the Kenai group. 2 Cretaceous Aucella beds lie 

 beneath the Kenai, but whether marine beds of the same age as 

 Kenai intervene is uncertain. 3 "In Alaska, at Cook's Inlet, at 

 Unga Island, at Atka and at Nulato in the Yukon valley we find the 

 leaf beds of the Kenai group immediately and conformably over- 

 lain by marine beds containing fossil shells which are common to 

 the Miocene of Astoria, Oregon, and to middle and southern Cali- 

 fornia." 4 Kenai rocks consist of "great thicknesses of some- 

 what loosely consolidated conglomerates, sandstones, and shales, 

 all generally greenish in character. They contain everywhere 



'Fairbanks : loc. cit., pp. 67, 68. 



2 Dall and Harris, Bull. No. 84 U. S. Geol. Surv., pp. 234 et. seq., 1892. 



3 Ibid., loc. cit., p. 251. *■ Ibid, loc. cit., p. 251. 



