314 EDWARD M. KINDLE 
and Spirifer gregarius are abundant and characteristic fossils of the 
upper portion of the formation. The lower part of the Jefferson- 
ville limestone, and the Louisville limestone are well exposed in 
the Bear Grass Creek quarries just east of Louisville, Ky. The 
section exposed at the west quarry shows: 
LOUISVILLE SECTION Ft. 
1. White to light-gray limestone (Jeffersonville limestone).............. ie) 
2. Light bluish-gray argillaceous limestone (Louisville limestone)........ 35 
Although all of the sediments and faunas which, in eastern New 
York, represent the Helderberg group and Oriskany sandstone 
are missing between the Jeffersonville and the Louisville limestones, 
evidence of angular unconformity has not been observed in the 
River sections. Such evidence has been secured a little farther 
north, however. 
North of the Falls of the Ohio to or 15 miles, sections which 
include the Lower Devonian and Niagaran rocks begin to show a 
thin bed of rather soft, dark-buff to brownish fine-grained mag- 
nesian limestone—the Geneva limestone. This formation lies 
between the Jeffersonville limestone and the Louisville limestone. 
It thickens gradually toward the north and reaches its maximum 
development along Flat Rock Creek. The Geneva limestone is 
generally a massive light-buff to chocolate-brown saccharoidal 
magnesian limestone. It varies in lithological characters, however. 
Along Wyloosing Creek, in Jennings County, it is in part a very 
hard siliceous limestone and was used at one time for mill stones. 
The fauna of the Geneva limestone indicates that it is of either 
Schoharie or Onondaga age;* probably the former. At the base 
of the Geneva unmistakable physical evidence of the hiatus between 
the Geneva and the Louisville limestones has been obtained. An 
outcrop on the east side of Flat Rock Creek at the ford about 13 
miles above Geneva shows this disconformity. The section exposed 
at this point is: 
FLAT ROCK CREEK SECTION Ft. In. 
1. Brownish dolomitic saccharoidal limestone (Geneva limestone) ..... 3 
2. Hardjlight-pray limestone! (couisville) seve" ae aan eee 50 
3. Blue fossiliferous clay with irregular masses of limestone (Waldron 
Shale) ie disse! sic ecbenece tame ois ale ay cleve dee ete aural e any nue eae 5 
4; Hard:gray limestones, <0 002 cares oe cael yar er alee eee 15 
1K. M. Kindle. Jnd. Dept. Geol. Nat. Res., 25th Ann. Rept., pp. 535-58, 1901. 
