MISSISSIPPIAN ROCKS OF NORTHEASTERN OKLAHOMA 617 



The following species have been identified from the Fern Glen 

 horizon in the Siloam Springs quadrangle: Cyathaxonia arcuata 

 Weller, C. minor Weller, Cladochonus americanus Weller, Amplexus 

 brevis Weller, Fisiulipora fernglenensis Weller, Cystodictya cj. 

 lineata Ulrich, Actinocrinus rubra Weller, Rhipidomella michelinia 

 L'Eveille, Schizophoria swallovi Hall, Productus fernglenensis 

 Weller, P. sampsoni Weller, P. sp., Camarotoechia persinuata 

 Winchell, Spirifer vernonensis Swallow, S. fernglenensis Weller, 

 5. grimesi Hall, 5. choteauensis Weller, Spiriferina subtexta White, 

 Athyris lamellosa L'Eveille, Cleiothyris prouti Swallow, C. royssi 

 L'Eveille, and Platyceras paralius W. and W. There are alsi3 

 several unidentified species of bryozoa, principally fenestellids. 

 The Productus listed as P. sp. is a large species known to occur also 

 in the Chouteau limestone of Missouri. 



The greater portion of the Boone consists of limestone and chert. 

 In most of the good exposures observed by the writer, the limestone 

 and chert occur in alternate layers averaging about one to two feet 

 in thickness. In many cases, however, the chert is distributed 

 irregularly through the limestone as lenses and nodules. The 

 cherts are often fossiliferous but practically no work has been 

 done on the paleontology of the Boone in Oklahoma. In the Mus- 

 kogee and Tahlequah folios Taff lists the following species from 

 the cherts in the upper part of the formation: Amplexus fragilis 

 White and St. John, Glyptopora keyserlingi Prout, Fenestella multi- 

 spinosa Ulrich, Polypora maccoyana Ulrich, Hemitrypa proutana 

 Ulrich, Pinnatopora striata Ulrich, Spirifer logani Hall, Reticularia 

 pseudolineata Hall, Productus setigerus Hall, Derby a keokuk Hall, 

 and Capulus equilaterus Hall. In a small collection from a few 

 miles east of the town of Pryor Creek in the Pryor quadrangle the 

 writer has noted Productus setigerus, Spirifer logani, and Derby a 

 keokuk. This fauna is decidedly indicative of Keokuk age. 



In general it may be said that there are no strata in the Boone 

 in Oklahoma which permit the formation to be divided into mem- 

 bers. In the Joplin district in Missouri, SiebenthaP distinguishes 

 the Grand Falls chert and Short Creek oolite members. In the 



^ C. E. Siebe.. hal, Joplin District folio (No. 148), Geologic Atlas of ike United 

 Slates, U.S. Geol. ..iirvey, 1907. 



