86 IOWA ACADEMY OF SCIENCE 



Collections of fossils have been made at Stennett, near Thur- 

 man, Hamburg, McKissicks Grove, and Mill creek, south of 

 Riverton. The lower twenty feet of shales above the Tarkio lime- 

 stone and the Nyman coal cap rock at McKissicks Grove are 

 highly fossiliferous, while the upper arenaceous limestone is 

 sparingly so. It is thought advisable to list the fauna of the 

 tipper limestone at Thurman and Mill creek separately. 



THURMAN FAUNA. 



Foraminifeka — Hustedia mormoni. 



Fusulina secalica. Marginifera wabashensis. 



Anthozoa — Productus cora. 



Lophophylluni profundum. Productus semireticulatus. 



Crinoidea — Pugnax uta. 



Ceriocrinus hemisphericus. Seminula argentea. 



Bryozoa — Spirifer cameratus. 



Fenestella perelegans. Pelecypoda — 



Fistulipora nodulifera. Allorisma terminale. 



Rhombopora lepidodendroides. Aviculopecten occidentalis. 



Brachiopoda — Edmondia nebrascensis. 



Ambocoelia planoconvexa. Myalina swallovi. 



Chonetes geinitzianus. Gastropoda — 



Chonetes granulifer. Euphemus carbonarius. 



MILL CREEK FAUNA. 



FORAMINIFERA — PELECYPODA — 



Fusulina secalica. Aviculopecten providencesis. 



Brachiopoda — Myalina swallovi. 



Chonetes geinitzianus. Gastropoda — 

 Chonetes granulifer. Bucanopsis marcouanus. 



Spirifer cameratus. 



It is a surprise that Aviculopecten providencesis should be 

 found so high in the Carboniferous. The identification can not 

 be mistaken, for, as stated by Beede, it is easily separated from 

 the other Carboniferous species by its large size and fasciculation 

 of the striae. 



McKISSICKS GROVE FAUNA. 



Lowe Shale Fauna. 



Foraminifera — Rhombopora lepidodendroides. 



Fusulina secalica. Brachiopoda — 



Anthozoa — Ambocoelia planoconvexa. 



Lophophyllum profundum. Chonetes geinitzianus. 



Crinoidea — Chonetes granulifer. 



Ceriocrinus hemisphericus. Dielasma bovidens. 



Bryozoa — Enteletes hemiplicata. 



Fistulipora nodulifera. Hustedia mormoni. 



