144 H. F. BAIN — GEOLOGY OF THE WICHITA MOUNTAINS 



From the limestone of the Fort Sill quarry a few species were secured, 

 as follows:* 



1. Ophileta sp. 



2. Fragments of trilobites, genus and species undetermined. 



While all these fossils are in a very unsatisfactory condition for deter- 

 mination, there seems to he no doubt of their Calciferous or Chazy age. 



The third horizon is that of the Trenton limestone. The only locality 

 from which Trenton fossils have been examined is Rainy mountain. A 

 few of these were submitted by Mr Bain, but most of them were col- 

 lected by Professor Salisbury. The species recognized are as follows : 



1. Ceraurus, sp. undetermined. 



2. Isotelus gigas De Kay or megistos Locke. A single imperfect thoracic segment. 



3. THnucleus concenlricus Eaton. 



4. Rltyncltonella sp. 



5. Orthis (Dalmanella) tesiudinaria Dal. 



6. Rafinesqmna alternata Emm. 



7. Lingula rectilateralis Emm. 



* From Fort Sill Vaughap reports Paleophycus, Mnrchisoaia, Cyrtoceras, Linguella cf. L. lamborni, 



and Asaphas, from which it is suggested that the beds may be as late as the Trenton. — H. F. B. 



