I02 Cinciunati Society of Natural History. 



Feet. In. 



of the .section, a.s it i.s covered b}- heavy stone set on 

 end to form a culvert under tlie road. About 6 feet 

 from the top, liowever, a heavy waved layer of limestone 

 was .seen. From about this point down are the 50 feet 

 which have been called the Point Pleasant Beds, or the 

 Trenton of some authors. In the beds of other ra- 

 vines, in one in particular about a mile to the west- 

 ward, is an extensive bed of shale, not slaty, however, 

 and apparently destitute of organic remains. This, in 

 fact, is the case with all the shale beds of the region. 

 While the limestone layers are generally full of fossils, 

 the shale beds are barren. Above this point limestone , 

 predominates; below it the limestones and shales are in 

 about equal proportions. 



Shale and limestone, • ■ 1 1 4 



This interval is also largely concealed, being covered 

 by debris brought 1)>" tlie stream from above or washed 

 out of the banks on either side. The shale alternates 

 with the limestone in courses. The slabs in the stream 

 bed are covered with fragments of brachiopods, crinoid 

 stems, etc. Corals are also abundant, particularly in 

 the upper portion. Asaphus, Strophonicna, various forms 

 of Gasteropoda and Urtlioccras also occur. One layer 

 of limestone 2 feet 3 inches thick, lies in three courses, 

 and is largely made up of finely comminuted fo.ssils. 



Limestone and shale, tlic former with a few obscure and 



irregular " fucoidal " markings i 3 



Litnestone, compact and unlike most of the layers in 

 beintj unfossiliferous; it breaks across the beddinj^ into 

 oblonji, rectangular blocks shaped like scythe stones, 

 but on an enlarged scale, — 2 



Yellow shale, 1 2 



Limestone, forming a waved layer above, and separated 

 from an uneven lower course by yellow shale. The 

 upper layer is formed of fragments of crinoids, brachi- 

 opods, etc I 9 



Blue and yellow shale, 1 4 



This contains a thin layer of limestone, with sjjccies 

 of Or t /lis, Asaf>/iiis, Ciilyiiutu\ /.externa scritra, etc., 

 mostly (except the last) in a fragmentary condition. 



