Age of the Pt. Pleasant Beds. 103 



l'"lCt. In. 



Limestone, more or less waved and formed of fraj(nients 

 of Hrachiopoda, .Isaphus, Monticii/ipora, etc. These 



last are all braiichinj^ or parasitic, — 6 



Yellow shale — 6 



Limestone, — 2 



Blue shale — 7 



Limestone and shale, 1 4 



The shale is largely covered by deliris, l>ut the lime- 

 stone is well exposed, and is markedly waved, the dis- 

 tance between crest and crest of the undulations l^eing 

 3 feet 6 inches, and the depth of the hollow about 6 in. 

 The rock is formed of finely comminuted fragments of 

 crinoids, .Isap/iiis, Ort/iis, etc., and contains specimens 

 of StropJiODicna and Ptilodictya falciformis (f) 



Limestone and shale, the former seamed and broken, . . — 6 

 Limestone and shale, i — 



The shale has nodules in it containing specimens of 

 Orthis testudhiaria or O. Jnoosa. The limestone is 

 made up of countless fragments of crinoid stems, and 

 with what appear to be basis of crinoids or of species of 

 Ptilodictya. Monticulipora, Ortlwccras, Asaphus, etc., 

 also occur. 



Limestone, very uneven in itsl)edding, — 4 



Shale, — 3 



Limestone, in a compact layer, underlain b}' a seam of blue 



shale, — 2 



Covered, 1 1 6 



Total 189 6 



Section cut off by river. 



The lower portion of the section below the top of the sup- 

 posed Point Pleasant Beds has been given in considerable de- 

 tail, to determine, if possible, whether there were any features 

 of the rocks different from those ordinarily seen in the rOcks 

 at the base of the Cincinnati section. None were observed. 

 The section is a continuous succession of shales and limestones, 

 the latter sometimes in heavy, and again in thin, courses.- The 

 heavy layers are not specially prevalent in the lowest 50 feet ; 

 indeed, the heaviest layer is over 80 feet above the river. There 

 is no break in the deposition, unless it be in the 20 feet now 

 covered, and no marked change in the characters presented. 



