FAUNA OF MANLINS LIMESTONE OF OHIO 353 



In addition to this brecciation the series contains " an immense amount 

 of true conglomerate," in which the pebbles, derived from the limestone, 

 often are of enormous size, even up to a ton in weight. This intra- 

 formational conglomerate is best developed in Lucas county, near the 

 extreme western end of lake Erie, and furnishes ample proof of shallow 

 water, if not repeated land conditions, during the formation of these de- 

 posits. Sun cracks and thin layers of carbonaceous matter are further 

 proofs of shallow-water conditions. The petroliferous character of the 

 Manlius limestone noted at Akron and other places in Erie county is 

 also a very characteristic feature of this rock in Ohio, where, moreover, 

 streaks and masses of asphaltum occur. 



In the northwestern portion of Ohio and the adjacent territory in 

 Michigan, the Waterlime has interpolated between its members, beds of 

 pure quartz sand, of which that known as the Sylvania sandstone, used 

 for glass making, has a thickness of 20 or more feet in the Sylvania 

 quarries, and lies at least 200 feet below the Corniferous limestone.* 

 The following species have been described by Whitfield (1893) from this 

 rock at Greenfield, in Highland county, Southern Ohio: 



Streptorhynchus {Ortliothetes) hydrauHcum Whitfield (also at Belleville, San- 

 dusky county). 

 Meristella Isevis (Vanuxem). 

 Meristella bella (Hall). 

 Nucleospira rotundata (Whitfield). 

 Relzia (Rhynchospira) formosa Hall. 

 Rhynchonella hydraulica Whitfield. 

 Leperditia angulifera Whitfield. 



From Eut-in-Bay island, where this rock is well developed, the fol- 

 lowing species have been described :f 



Spirifer vanuxemi Hall. Goniopliora dubia Hall (also from 



Pterinea aviculoidea Hall. Marion county). 



Euryplerus eriensis Whitfield. 



Leperditia alta Conrad was described from Bellevue, Sandusky county, 

 and Pentamerus pes-ovis Whitfield from Adams county. 



In the Lower Peninsula of Michigan the Oriskany is represented, ac- 

 cording to Rominger (1876), by a soft, friable, occasionally perfectly 

 white, sandstone. It contains impressions of Spirifer, of bivalves, and 

 of gastropods. In places it is almost pure quartz, without admixture of 

 foreign substances, and is extensively used for making glass. Its thick- 

 ness is 6 or 7 feet in most places, and it never exceeds 8 or 10 feet. 



* Orton, 1893, p. 17. 

 f "Whitfield, loc. cit. 



