NORTH AMERICA AND THEIR VERTEBRATE FAUNA. 4I 



Section 40. — Section in the east bluff of Wichita River, 0.75 mile north- 

 west of Byers, Clay County (Udden). ^^^^ 



4. Gray sandstone, with a 6-inch layer of concretionary conglomerate, greenish- 



gray in color 15 



3. Red clay 8 



2. Bluish-green shale 6 



1. Talus 15 



44 



Section 41. — In a low bluff facing east, at a point about 3 miles west of 

 Henrietta, Clay County, 0.5 mile south of the Fort Worth and Denver 

 Railroad, there are some beds that have been explored for copper, 

 which occurs in the forms of malachite, azurite, and gray copper 

 sulphide (Udden) . The copper has accumulated mostly on the under 

 surface of some carbonaceous clay bands, in cavities once filled with 

 plant remains, and also in some joints in sandstone. The section 

 exposed, partly in an old excavation, is as follows: 



Ft. In. 



9. Sandstone 8 



8. Black shale o 4 



7. Sandstone containing carbonaceous shreds of leaves and other vegetation o 6 

 6. Black shale, with a more or less continuous infiltration of copper ore 



against its lower surface o 4 



5. Sandstone, containing shreds of vegetation o 6 



4. Blackshale, with frequent incrustations of copper ore on the lower surface o 2 



3. Shale and sandstone 2 



2. Sandstone, impregnated with copper along some joints and containing 



some impressions of tree-stems and other remains of vegetation, which 

 are partly filled with copper ore 2 



1. Shale i-l- 



14+ 8 



Section 42. — ^About 3 miles northeast of Wichita Falls, in Clay County, a 

 low bluff, facing westward, runs for almost a mile in a general north 

 and south direction (Udden). At the north end the strata exposed 

 in this escarpment form an isolated butte. The section in this butte 

 is as follows : p^^^ 



5. Gray sandstone, soft and homogeneous in some places, in other places con- 



cretionary, cross-bedded, or cemented by interstitial lime to a hard rock; 



this sandstone forms the cap of the escarpment; maximum thickness 8 



4. Gray and blotched brown shale, sandy in places, and containing calcareous 



concretions 8 



3. Red shale, with here and there gray blotches and streaks 11 



2. Gray sandstone, much cross-bedded, partly straightly and thinly laminated. 3 

 I. Shale, gray and brownish, with many dark, calcareous concretions 15 



45 



Section 4j. — Cassil Hollow, 2.5 miles south of Fulda, Texas (Gordon). 



Feet. 



6. Sandstones, thin-bedded, shaly, with a fine exhibition of ripple-marks; repre- 



sents the top of the section and grades into No. 4 6 



5. Blue and yellow laminated clay and sandy shale, grading horizontally into 



white shaly sandstones, same as No. 6; the plants were found in a thin 

 shale stratum near the middle of this division 6.5 



4. Hard bluish limestone which weathers to a brown; apparently the equivalent 



of a limestone which outcrops on the Wichita nearly due north from this 

 locality at the Bar X Ranch; contains an abundance of fragments of 

 vertebrate remains, but aU in such a comminuted condition as to be inde- 

 terminable 2 



3. Blue clay shales 3 



2. Red clay shales; same as No. 3, except in color 4 



I. Gray sandy shales and sandstones to bottom of ravine 15 



36.5 



