loo Cincinnali Society of Xaliiial /lisiory. 



In I.S90 the same reference is a.^ain made by Prof. Orton,"'^ 

 but no details beyond those already mentioned are given. 



The references above given comprise some of tho.se that 

 have been made to the rocks of Cincinnati, and they are all, 

 we believe, that have considered the Trenton to occur in out- 

 crop in Ohio. In order to study the section at Point Pleasant, 

 I visited it last year (1890) and secured the data given below. 

 A careful study of the fossils collected, and of other localities 

 in the neig'hborhood, will add something to the account here 

 given, but it is not believed the conclusions will be materially 

 modified. Tlie section studied is in the bed of a small stream 

 that heads near the top of tlie hill. It is situated about half a 

 mile below the village of Point Plea.sant, and two openings 

 have been made in the hill near the wagon road, about fifty 

 feet from the water's edge. 



vSl<;CTION .\T POINT I'l.HAS.VNT, OHIO. 



Feet. In. 



Hill slope (covered) . . — — 



Liinestone, with a few thin l)aii(ls of shale 40 — 



Sliale, with occasi(jiial thin layers of limestone, . . . . 37 — • 



TriiiKclcits concoitricus was fotiiid in a limestone la\cr 

 o\e riving a layer containing mud cracks. 



Limestone, with occasional b;ds of shale, 30 4 



There are two very decidedly waxed la\ers in this 

 distance of 30 feet 4 inches. One is near the t(jp and 

 the other near the bottom. In the latter, the distance 

 from crest to crest of the waves was 4 ieet 6 inches. 

 This layer was largely made up of crinoid stems. 



Heavy bed of limestone 2 — 



This course is remirkable for its C()m])actness, thick- 

 ness and extent. It contains mau\' fossils, such as 

 branching sj^ecies of Montictilipora, vStrophomena, etc. 

 It is plainly visible about midway in the cjuarry open- 

 ing on either side of the ra\ine, and it is a marked fea- 

 ture in the (luarries along the road between New Rich- 

 mond and Point Pleasant. In one of the.se quarries a 

 great mass had fallen down, more or less concretionary 



'■'I'irst .\mi. Rci)ort Gt-ol. Sur Oliio Uiird org.-oiizatioii , 1890, page 12. 



