Record of Geology of Texas, 188 ' 7 - 1896 . 
59 
Cummins^ W. F. 
species pass up into the overlying limestones of the Permian, and other 
species of newer type take their places. The same may toe said of the 
fauna on the line of contact between the Coal Measures and the Wichita 
Beds. 
“The iDoutole Mountain Beds do not reach the Coal Measures at any 
point, tout lie confo.rmatoly upon 'the Clear Fork Beds. The Clear Fork 
Beds are the only ones that reach the southern extremity of the Permian 
district. . 
“The Permian Beds are overlaid on the west toy the Jura-Trias ( ?) and 
Cretaceous- It is evident from the remaining touttes and ranges of Cre- 
taceous hills that the entire Permian and Carboniferous strata were at 
one time covered by the Cretaceous, at least along the southern portion of 
the district. Erosion has again removed these strata and exposed the 
older beds.” Pp. 185-187. 
( 38 . ^ and Leech, Dr. Otto. 
A Geological Survey of the Concho Country, State of Texas-. 
A-mer. Geologist, Vol. V. pp. 321-335. 'Minneapolis, June, 
1890'. 
The country takes its name from the Concho river. iSituation: West 
of the 100th meridian and between the 31st and 32d parallels of north 
latitude. iSan Angelo, the chief town- Drainage and topography: 'North 
Concho river; Main -Concho; Spring and Dove creeks; iSouth Concho and 
Colorado rivers. 'Source and fall of the streams. [Relation of topography 
to geology- (River valleys, plateaus, etc. (Geology. Alluvium. Drift. 
Local beds of conglomerate. Lacustrine Deposits. The Cretacic. Posi- 
tion. Dip. Topography. Character of deposits. The group here exposed 
is called Comanche series by Hill. 'Section on 'South Concho, 20 miles 
south of 'San Angelo. List of fossils. The Permian: Position and dip; 
Commingling of Carbonic and newer forms of life; Color of deposits and 
other Characters; Gypsum beds along the Colorado river. Estimated 
thickness of the Permian. 'Section of the Permian; List of fossils. Eco- 
nomic Geology. Climate. Movement of the air. Table. Table showing 
the average temperature together with the highest and lowest points re- 
corded during each month since April, 1868, at Fort Concho, (San Angelo. 
North winds. Temperature. Rainfall. Table showing rainfall at San 
Angelo since April, 1868. Water of the rivers. iSubterranean water. 
Depth. , iSeoti'Ons of wells. Artesian wells. (Salt and other mineral wells. 
'Soils. -Building material. Quicklime. Cement. Clay. Irrigation. 
Grasses. Timber. 
69. 
Report of. 
Second Ann. Rept. of Geol. Snrv. of Texas, 1890, pp. xeviii- 
ci. Austin, 1891. 
Administrative Report on work do'ne between January I, and Decem- 
ber 31, 1890, which began at Dookum, Dickens county, and ended at Lam- 
pasas. Route followed. Area surveyed Permian and Carboniferous. Re- 
