Blake—Arizona Diatomile. 
Ill 
Extensive deposits of this nature derive additional scientific 
interest of late from, the suggested possible connection of these 
microscopic organisms with the genesis of petroleum. Some 
of the layers of compact silica in the Monterey series are highly 
bituminous. Dr. Phillips, the Director of the Texas Geological 
Survey, has observed globules of petroleum in diatoms from the 
marine ooze off the Sabine Pass. 1 
The lacustrine or marine estuarine origin of the Arizona de¬ 
posits has been discussed by me in a recent paper on Lake 
Quiburis, 2 
1 “Texas Petr oleum” by Wm. Battle Phillips, Ph. D., Bull. No. 5 of 
the Univ. of Texas (1901), pp. 20-28. 
2 Arizona University Monthly. March, 1902. 
