OLENTANGY SHALE AND DEVONIAN DEPOSITS 479 



FAUNA 



Baryphyllum verneuilanum, Cladopora canadensis, Cladapora 

 roemeri, Cystiphyllum vesiculosum, Favosites alpenaensis, Favo- 

 sites billingsi, Favosites placenta, Favosites radiciformis, Fav- 

 osites turbinatus, Heliophyllum halli, Syringopora intermedia, 

 Zaphrentis prolifica, Polypora; sp., Atrypa reticularis, Athyris 

 vittata, Chonetes mucronatus, Chonetes scitulus, Rhipidomella 

 vanuxemi, Schizophoria striatula, Spirifer audaculus macronotus, 

 Spirifer mucronatus, Stropheodonta demissa, Platyceras erectum, 

 Phacops rana 



Olentangy 

 Shale 



3. Shale, blue, alternating with blue argillaceous limestone; very 

 poorly exposed but weathered blocks of the limestone lie on the 

 steep bank and numerous fossils have weathered out of the 

 softer layers 1 5 ± o 



FAUNA 



Ceratopora rugosa, Zaphrentis prolifica, Spirorbis, angulatus, 

 Spirorbis omphalodes, Acanthoclema hamiltonensis, Batostomella 

 obliqua, Botryllopora socialis, Cystodictya hamiltonesnsis, Fis- 

 tulipora spinulifera, Hederella filiformis, Orbignyella monticula, 

 Polypora sp., Ambocoelia umbonata, Atrypa reticularis, Chonetes 

 deflectus, Chonetes scitulus, Crania hamiltonensis, Cryptonella 

 planirostra, Leiorhynchus laura, Rhipodomella cyclas, Schizo- 

 phoria striatula, Spirifer mucronatus, Stropheodonta demissa, 

 Fish plate 



2. Shale, marly, blue, badly weathered and soil-covered 10=*= o 



1. Shale, blue, with disk-like blue limestone concretions 5± o 



The lower part of the shales in these sections is apparently not 

 very fossiliferous. The same is usually true of the Lower Hamilton 

 of Ontario and in many places of the similar deposits in New York. 

 This is probably even more characteristic of the Olentangy shale in 

 central Ohio. However, at Delaware, Winchell's type section 

 of the Olentangy, a few poorly preserved fossils 1 were found which, 

 although only given generic identification, are believed to be 

 identical with others found in the shales of the Sandusky region. 

 It was at Delaware also that the crinoid bed was found in the 

 Olentangy shale — a lens corresponding in every way with the 

 thin lenses of crinoidal limestone common in the lower shales of 



1 Geological Survey of Ohio, Bulletin No. 10, 4th series, 1909, p. 89. 



