and Steplearum. Exploring the Clinton were at least several inches of basal Niagara. The top of the Lower Oswego shale is well exposed, and is found 17 to 20 feet above the Clinton. The upper 15 inches of this horizon are formed by a hard clay rubble, but the part beneath is shaly. The Oswego limestone is 3 feet 8 inches thick. It is a dense limestone, breaking irregularly. The Upper Oswego shale is 5 ft 6 inches thick, and disintegrates into a blue clay. One foot of the Laurel lime- stone is exposed in this part of the field. At Patrick Fitz- gerald's quarry, half way between Perrie Valley and Beard's station, along a road leading south from the railroad nearly 20 feet of Laurel limestone are ex- posed. Beginning 8 1/2 feet from the base of the quarry several chert layers, very tin run between some of the limestone beds. 5 mft Below the Clinton at the Sinclair farm are 8 feet of the dark blue dense limestone layer with Orthoceras, Mon- cherzina & cumelli and the other fossils found in the cor- responding bed at Madison. This is the most southern ex- posure so far seen. Only the top of the Madison beds are exposed in the field, but farther down the same road, beyond Rodman's Fork, at least 13 feet of very typical banded Mad- ison rock are exposed, at a level some eight once be- low the dense lime layers men- tioned above. And just before reaching Floyd's Fork, 25 feet of very typical banded Madison rock are exposed. just before or About 2 feet lower down is a layer of bluish calcareous but rather soft stone with Orthis occidentalis and Bryza. The bed of Floyd's fork is 18 feet below.