436 CHARLES S. PROSSER 



of Franklin Counties, where there is from four feet eight inches to 

 six feet of limestone or shale intervening between the base of the 

 owest conspicuous chert layer and the bone-bed at the top of the 

 Columbus limestone. On the other hand, there is evidence favoring 

 the reference of the crinoidal layers to the Columbus limestone 

 which is the view taken by Dr. Swartz. He has written me as fol- 

 lows regarding this point : 



I became convinced that the best ground of separation is the faunal break, 

 and it seemed to me that probably the encrinital rock is more nearly related to 

 the underlying than to the overlying strata, especially as it contains Elceacrinus 

 verneuili, a characteristic form in the encrinital rock at Columbus. Yet in my 

 dissertation I noted the fact that the encrinital rock may be above the horizon 

 of the Columbus "bone-bed." 1 



It is to be noted, however, that Dr. Bownocker reported the 

 Blastoid — Nucleocrinus verneuili (Troost) — from above the bone- 

 bed in the quarries near Marion. 2 



SCHOEPFLE & SON'S QUARRY 



This quarry is located on the eastern side of Hancock Street in 

 Sandusky, and is the only one of the various quarries in that section 

 of the city which is now actively worked. The following section 

 was measured on the southern wall toward its western end : 



Thickness Total Thick- 

 No, (Feet) ness (Feet) 



9. Rather crinoidal limestone, which in the upper part is 2f 15I 



quite light gray in color. It contains Spirifer duodena- 

 rius Hall, and other fossils and corals are quite fre- 

 quent near its top. 

 8. Shale parting. i 13 



7. Somewhat brownish-gray layer as weathered, contain- v}\ 12! 



ing crinoid segments, some corals, and small Spirifers. 

 6. Shale parting. ~h nil 



5. Bluish-gray limestone, not so even-bedded as lower 2^2 n* 



layers, which also weathers rougher on exposed surfaces 

 and contains a considerable number of cup corals, Crin- 

 oid segments, and small Spirifers. 

 4. Shale parting. I 8f 



3. Bluish-gray, compact, fairly even-bedded limestones, 3!- 8tV 



the upper part of which is thinner-bedded. Building 

 stone, moderately fossiliferous. 



1 Letter of January 14, 1005. 



2 Bulletin of the Science Laboratories of Denison University, Vol. XI (1898), p. 27. 



