GEOLOGICAL AND NATURiiL HISTORY SURVEYS. 493 



Annual Keport of the State Geologist, E. T. Dumble. 



Report on the (Geology and Water Conditions of Southwest Texas, E. T. 

 Dumble. 

 Report on the Clays of Texas, W. Kennedy. 



Report on the Cretaceous Area West of the Colorado River, J. A. Taff. 

 Report on the Permian of Texas, W. E. Cummins. 

 Monograph of the Tertiary Invertebrates of Texas, G. D. Hai'ris. 

 Triassic Unionidae, Chas. T. Simpson. 

 A Geological Map of the State of Texas, compiled by E. T. Dumble. 



Mr. Dumble, in 1902, published a paper in the Transactions of the 

 American Institute of Mining Engineers, entitled Geology of South- 

 west Texas, containing a portion of the matter in the report sub- 

 mitted with the fifth annual report. Mr, Simpson printed his con- 

 tribution in the papers of the United States National Museum, and 

 Mr. G. D. Harris published that portion of his work representing 

 new species in the Proceedings of the Philadelphia Academy. 



Wo7'7t: of the sixth year {ISOIf.). — The corps at the beginning of 

 this year consisted of the State geologist, one geologist (Cummins), 

 jind a small office force. Witli the expiration of the appropriation, 

 February 28, the office force was discontinued. 



The last field work under the appropriation included a careful 

 examination of the water conditions along the Texas and Pacific Eail- 

 way, between San Martin and Kent, on the north face of the Davis 

 Mountains, and the investigation of the San Carlos coal field in El 

 Paso County. The lack of an appropriation, however, did not en- 

 tirely stop the work, for during the year the following investigations 

 were made by Mr. Dumble as State geologist : 



That of the water conditions of a large part of Hall County, in- 

 cluding the town of Memphis; a similar investigation of the valley 

 of the Pedernales from Fredericksbui-g westward; examination of 

 the water conditions of the town of Mexia, in which Professor Cum- 

 mins assisted; a study of the artesian conditions along the Interna- 

 tional and Great Northern Railroad from Houston to Groveton; a 

 brief investigation of the asphaltum deposits of Burnett County, in 

 company with Doctor Penrose; a study of the Diabolo Mountain 

 section in the vicinity of the Hazel mine. Professor Cummins as- 

 sisted in this last and spent the remainder of the season on work 

 in the vicinity of the Eagle Mountains and westward. 



The chemical laboratory was reopened, and Mr. Dumble did coji- 

 siderable chemical work during the Intter portion of the year in 

 answer to numerous inquiries therefor. In tlie museum considerable 

 progress Avas made in the reniTangement and classification of the 

 ' llections. 



The publications based on these examinations were as follows: 



