(S20 E. O. ULRICH CORRELATIONS OF CHESTER FORMATIONS 



Fredonia species. 12 This comprises more than 150 species and includes 

 many species that are well entitled to be designated as distinctive Chester 

 types. Indeed, my analysis of the Fredonia fauna indicates that 70 per 

 cent of the total Fredonia fauna as known to me is more closely related 

 to subsequent Chester fossils than to preceding faunas. 



Eunning through my published long list of Fredonia fossils, I have 

 selected the following as clearly meriting, in the present state of our 

 knowledge, the distinction of being considered as Chester rather than 

 Meramec species : Triplophyllum spinulosum, Michelinia n. sp., the four 

 species of Pentremites, Anisotrypa fistulosa, Rliombopora persimilis, 

 Cystodictya labiosa, Fenestella cf . cestriensis, F. elevatipom, two species 

 of Polypora, Archimedes meehanus, Thamniscus futcillatus, all four of 

 the species of Productus, Diaphragmus montesana, Spirifer cf. leidyi, 

 S. pellcensis, Reticularia setigera, three of the species of Spiriferina, the 

 four species of Aviculopecten, at least 12 of the remaining 21 pelecypods, 

 and 14 or 15 of the 37 gastropods, 7 of the remaining 22 gastropods being 

 as near Spergen species as to Gasper forms, while the others are of un- 

 known stratigraphic significance. Evidently the trend of the fossil evi- 

 dence is, like that afforded by comprehensive and geographically extended 

 study of the physical criteria, much more decisively favorable to the in- 

 clusion of the Sainte Genevieve in the Chester series than Weller would 

 have us believe. 



THE UPPER OHARA FAUNA 



In discussing my list of Upper Ohara fossils Weller 13 goes beyond the 

 bounds of fairness and prudence. I quote him as follows : 



''The fauna of the Slietlerville horizon is that of the so-called zone 3 of the 

 Ohara limestone as recorded by Ulrich, and the fauna! evidence as presented 

 by him exhibits an association of the characteristic Sainte Genevieve species, 

 Platycrinus penicillus, with the Amplexus geniculatus and its associates. 

 This supposed association is one of the strongest evidences Ulrich has pre- 

 sented for his union of the 'Upper Ohara' with the Sainte Genevieve, and 

 consequently his inclusion of the Sainte Genevieve in the Chester group. The 

 published list of this fauna, however, as presented by Ulrich, is grossly mis- 

 leading as to facts. He has not separated his faunal lists in accordance with 

 the localities from which they were collected, but has lumped together in one 

 composite list all those forms from all of the collections which he has either 

 correctly or incorrectly considered as representing this horizon." 



In the first place, he should have said that his Slietlerville formation 

 embraced not only my zone 3, but also zone 2, both being above the con- 



12 Op. cit, pp. 133-137. 



13 Hardin County Report, p. 141. 



