GIRTY, GEOLOGIC AGE OF THE BEDFORD SHALE 303 



This fauna I will now list in the terms in which it was then prepared, 

 as follows : 



Crania levis Keyes Camarotcechia metallica White ? 



Rhipiclomella n. sp. Paraphorhynchus striatum Simpson 



Schuchertella desiderata Hall and ■ mediate Simpson 



Clarke Pterinopecten alternatus Simpson 



Productella n. sp. Aviculipecten equalatus Simpson ? 



Product us n. sp. patulus Hall ? 



idem, n. var. ■ cancellatus Hall ? 



idem, n. var. Paleoneilo sp. 



• n. sp. Sphenotus sp. 



arcuatus Hall ? Hanguinolites senilis Herrick 



■ levicosta n. var. Spathella ? sp. 



Strophalosia-like form, n. gen. n. sp. Cypricardinia sp. 



Spirifer marionensis Shuinard Mytilarca sp. 



■ disjunctns Sowerby ? Edmondia ? sp. 



Cyrtina triplicata Simpson Straparollus roberti White ? 

 Syringothyris angnlata Simpson Platyceras varians Simpson 

 ■ extenu ata Hall ■ dor sale Simpson 



Athyris lamellosa L'fiveillee Tropidodiscus crytolites Hall 



Cliothyridina squamosa n. var. Conularia byblis White ? 



Camarotcechia heteropsis Winchell 



If this list is compared with the one which I shall give farther on, it 

 will he seen how very different the "Corry" fauna is from the fauna of 

 the Bedford shale. Thus the statement that a pronounced faunal change 

 marks the transition from Bedford to Berea time seems amply justified. 

 The second point which I wish to make in this connection is that, for the 

 first time in this region, in the ascending series, we have a fauna of dis- 

 tinctly Carboniferous type. The "Corry" fauna contains much that is 

 new, but the development of species of the Productus rather than the 

 Productella group (though on this I do not lay much stress because of 

 the difficulty of adequately determining one group from the other), and 

 especially of a Productus of the cor a type, an abundant Spirifer of the 

 marionensis type, Athyris lamellosa, a species of Cliothyridina, two spe- 

 cies of the Kinderhook genus Paraplwrhynchus and a few other forms, 

 identify this horizon as Carboniferous and probably Kinderhook. There 

 is, to be sure, some evidence pointing the other way, as for instance a 

 Spirifer doubtfully identified with S. disjunctus and the two Aviculipec- 

 tens, also doubtfully referred to Devonian species, but no one will ques- 

 tion on which side the evidence is stronger. 



The fauna of the Bedford shale has never been described in full. In- 

 complete faunal lists have been given in two or three instances. A few 

 species identified or figured from this formation may be found scattered 



