THE CINCINNATI GROUP 39 



Richmond limestone is also exposed a short distance up 

 stream from the home of W. D. Helton, on Beech creek, north- 

 west of Waynesboro. It is seven feet thick, is rather coarse- 

 grained, varies in color from light brown to bluish-gray, and is 

 fossiliferous. 



Among these fossils are the forms identified as Strophofnena 

 planodorsata ; Rafinesqiiina alternata; a large Cyclo?iema bilix similar 

 in form to that found in the Warren bed at Clifton, but having 

 a vertical height of 36'"'°; and a form of Dalmanella with a 

 moderately convex dorsal valve, evidently related to Delmaiiella 

 higosa as found in the Richmond of Ohio and Indiana. 



4. The Matmie shale, or shaly <r/(2)/.— Immediately above the 

 Richmond limestone, at Clifton, there is 15^^ feet of brownish 

 and bluish shal}^ Richmond clay. It contains Rafinesquina alter- 

 nata, Plectambonites sericeus, and Rhynchotrema. capax mafmiensis . 

 A single specimen of Dinorthis subquadrata was found imbedded 

 in the Clinton, one inch above its base. The characteristic mus- 

 cular area is exposed. The plications are somewhat finer and 

 more numerous than in the Richmond of Ohio, Indiana, and 

 Kentucky. The presence of Rhy?ichotrema capax ma?inie?isis in the 

 base of the Clinton has been noted already. They are simply 

 Richmond specimens loosened from the clay beneath and min- 

 gled by the wash of Clinton seas with living Clinton forms. 



Northwest of Waynesboro, on Beech creek, near the home of 

 W. D. Helton, the 20 to 25 feet of section between the Richmond 

 limestone and the Clinton, not exposed, probably consist of Rich- 

 mond clay. 



The upper part of the Richmond clay is seen beneath the 

 Clinton just north of the west end of the railroad bridge across 

 the Buffalo river northwest of Riverside, a mile and a half north 

 of Mannie or Aliens creek. Six feet is exposed ; unfossiliferous. 



About three-quarters of a mile west of Riverside, west of Mr. 

 Howard's home on the road to Flat Woods, east of the mouth of 

 Trace creek, the Richmond shaly clay is exposed on the north 

 side of the road. The exposure is 33j^ feet thick; the base of 

 clay is not seen. The lower 1 1 feet of the section consists of 

 fossiliferous weathered clayey rock ; the fossils are found chiefly 



