442 
The Ohio Naturalist. 
[Vol. XII, No. 3, 
county. Here Dinorthis carleyi , Leptaena richmondensis, Dal- 
manella jugosa, and Platystrophia ponderosa are found in descend- 
ing order. 
The typical exposure of the Arnheim bed is located on Straight 
creek, about a mile south of Arnheim, and five miles northeast of 
Georgetown, in Brown county: 
Strophomena concordensis near top of blue, nodular clay rock .6 ft. 
Limestone interbedded with much clay 12 ft. 
Strongly wave-marked limestone. 
Limestone interbedded with clay 7 ft. 
Dinorthis carleyi rare. 
Thin limestones and clay, with Leptaena richmondensis and 
Rhynchotrema dentata 6 in. 
Limestone and clay with Leptaena richmondensis 9 in. 
Clay with layers of nodules 2 ft. 4 in. 
Thin limestone with Leptaena richmondensis abundant 2 in. 
Limestone and clay 5ft. 
Platystrophia ponderosa abundant in limestone S in. 
Dalmanella jugosa var., abundant, largest specimens 22 milli- 
meters wide, associated with Platystrophia ponderosa , rather 
few 9 in. 
Poorly exposed 7 ft. 
Coarse grained, cross bedded limestone, with wave-marked 
layer five inches above the base 5 ft. 6 in. 
Limestone and clay interbedded 7 ft. 6 in. 
Rafinesquina very abundant 4 ft. 6 in. 
Limestone with bryozoans and other fossils 1ft. Gin. 
Mount Auburn top, consisting of clayey limestone with Platy- 
strophia ponderosa rather abundant 3 ft. 9 in. 
Wave-marked limestone layer. 
At Eddies run, one mile east of the line between Brown and 
Adams counties, and about six miles west of West Union, the 
following section is seen : 
Strophomena concordensis common in nodular clay rock oft. 
Interval 18 ft. Gin. 
Leptaena richmondensis rare 4 in. 
Interval oft. 
Leptaena richmondensis abundant 1 ft. 
Interval 10 ft. 
Platystrophia ponderosa and Dalmanella jugosa var. associated 
in the same layers 1 ft. 
Half a mile east of Manchester, the Beasley fork pike to West 
Union crosses Island creek, and a mile northward the Mount 
Auburn bed is exposed. A quarter of a mile farther northward, 
northwest of the home of A. H. Foster, Leptaena richmondensis is 
exposed five feet above layers containing Dalmanella jugosa var. 
and Platystrophia ponderosa. Strophomena concordensis occurs 
farther up stream. 
About three miles south of Maysville, in Kentucky, the deep 
cut at the highest point reached by the railroad exposes the 
following section : 
