32 
Aug. F. Foerste 
In Boyle county, and in the southern half of Mercer county, 
in Kentucky, the top of the Lexington limestone is formed by a 
rather coarse-grained, more or less cross-bedded, gray limestone, 
4 or 5 feet in thickness, overlying a fine-grained limestone sec- 
tion, about 20 feet thick. The fine-grained limestone forms the 
Perry ville member of the Lexington limestone. The upper part 
of the Perryville member, varying from 5 to 8 feet in thickness, 
is very hard, breaks with a splintery fracture, has a dove color, 
and frequently is marked with little whitish spots, which caused 
W. M. Linney to apply the term Upper Birdseye Beds to this 
part of the Lexington section. Westward at Perryville, Nevada, 
and Cornishville the underlying part of the Perryville bed is 
darker, softer, and much more richly fossiliferous. In fact, it 
is the richest fossil horizon in the Lexington section. Eastward, 
at Danville, a mile and a half northwest of Faulconer, and near 
Harrodsburg, this lower part of the Perryville section is whiter 
and even more richly fossiliferous. It contains the fauna de- 
scribed by Ulrich from the vicinity of Danville and Burgin and 
forms the Faulconer division of the Perryville. 
The coarse-grained limestone, overlying the Perryville member, 
may be called the Cornishville limestone, from the village in 
Mercer county, 11 miles north of Perryville. It contains 
Strophomena vicina, Dinorthis ulrichi, Hebertella frankfortensis, 
Platystrophia colbiensis, Rhynchotrema inaequivalve, and Stromato- 
cerium canadense. Strophomena vicina occurs in the Cornish- 
ville limestone at Cornishville, 9 miles west of Harrodsburg; 
at the railroad crossing, 2 miles northwest of Plarrodsburg ; at 
several localities along the railroad southeast of Harrodsburg, as 
far as the county line; and 2 miles east of Harrodsburg; all in 
Mercer county. In Boyle county,, it occurs at several localities 
within 3 miles southeast of Perryville, and between Perryville 
and Atoka. 
The Perryville bed may be identified 11 miles northeast of 
McAfee, on the farm of Mrs. Ben Williams, 2 miles south of the 
Crow distillery at Glenn Creek Station. Here the more typical 
part of the Perryville section is 7 feet thick. The rock resembles 
the darker, fine-grained limestone forming the lower part of the 
Perryville section at Cornishville, and contains Isochilina jonesi, 
Loxoceras milleri, and other fossils. The immediately underlying 
whitish siliceous limestone, 6 feet thick and full of gasteropod 
