ioo The American Geologist. August, 1905 
walking along the railroad. The upper part of the Wreford 
limestone was partially concealed as was most of the Mat- 
field formation. t Number 13 of Prosser's section corres- 
ponds to numbers 41 to 45 of our section. Number 14 of 
his section corresponds to numbers 46 to 47 of our section, 
including the shales and upper limestones of the Wreford 
limestone and all of the Matfield formation. The remain- 
der of our section, numbers 68 to 70, corresponds with num- 
ber 15 of his section, and represents the exposed thickness, 
of the Florence flint. 
From the foregoing it is clear that the Florence flint 
forms the crest of the "Flint Hills" west of Reece. From 
there west to El Dorado the railroad passes down the dip- 
slope of this stream. Proceeding south from Reece, 
changes begin to appear in the rocks making up the front 
of the escarpment. The Florence flint falls back to the 
west forming another small escarpment west of the town of 
Beaumont and the Wreford limestone has been removed 
from the notch through which the railroad passes in cross- 
ing the ridge, though it appears on the crest just north and 
south of Beaumont. The Wreford limestone outcrops in 
the streets of Beaumont, somewhat below the crest of the 
ridge east of the town which is formed by rocks of lower 
horizon.* 
South of the Reece section the "Frisco" railroad climbs 
the escarpment with numerous cuttings which produce 
practically a continuous exposure. No attempt was made 
to go to the base of the escarpment to establish a section 
but a base was chosen about 200 feet below the Wreford 
limestone, possibly in the top of the Elmdale formation. 
The detailed section follows : 
SECTION OF THE "FLINT HILLS" ESCARPMENT EAST OF 
BEAUMONT. 
42. Covered, to the base of the Wreford limestone 
in the crest of the hill south of 'the railroad 20 ft. inches 
41. Shales, red and blue, disintegrated, showing 
in cut 8+ " 
40. Shale, indurated, blue calcareous 5 " 
39. Shale, calcareous disintegrated 3 " 6 
t This correction also applies to the section published in U. S. Geol. 
Surv. Folio 109, p. 3, column 3. 
* Sellards left the field at the close of the work at Reece. 
