The Comanchean of Central Kansas. 



221 



Aiicnla salinacnsiK (White). 

 Ancliura kiowana Cragin. 

 Cardium katisascTisvi Meek. 

 Co-rhula sp. 

 Dentalium sp. 

 Lepto-^ohn ronradi Meek. 

 Lunatia sp. 

 Mactra sp. 



Nncida catharma Cragin. 

 Ostrea qti.adriplicata Shumard. 

 Ostrea sp. 



Protocardia texavxt Conrad. 

 Fholaduinyu auncti-vubiv (Roemer), 

 TeUinn subscitula Meek. 

 Trigonarca salinaensis Meek. 

 Tu7-riteUa helviderei Cragin. 



The Mentor fauna is far larger than is the Kiowa, and it also 

 appears to contain several species which are undescribi'd 

 Those known are as follows : 



Anchura kion-a)ia Cragin. 



Anomia sp. 



Arcopagella mactroides Meek. 



Avicida salinaensis (White). 



Barbatia parallela Meek. 



Cardium kausasense Meek. 



Corbicida? nucidis Meek. 



Corbicida? subtrigoualis Meek. 



Cor bid a sp. 



CrassateUina oblonga Meek. 



CypHmeria tcxana var. kiowana 



Cragin. 

 Cytherea sp. 



Gervilia mudgeana White. 

 Inesalia Kansasensis Meek. 

 Leptosolen conradi Meek. 

 Margarita mudgeana Meek. 



Modiola pedernalis Roemer. 

 Nemadon sp. 



Nticida catharina Cragin. 

 Ostrea qna^ripHcata Shumard. 

 Protocardia texana Conrad. 

 Rourdaria quadrans Cragin. 

 Sphenodiscus pedervalis Von Buch. 

 Tapes sp. 



Tellina subscitula Meek. 

 Trigonarca salinaensis Meek. 

 Trigovia clavigera? Cragin. 

 Trigonia emoryi Conrad. 

 Turritella kansasevsis Meek. 

 Turritella belviderei Cragin. 

 Yoldia viicrodonta Cragin. 

 Woedda microdonta Cragin. 



PROBLEMS OF THE CENTRAL KANSAS COMANCHEAN. 



The Comanchean of central Kansas contains several prob- 

 lems which are of considerable stratigraphic importance. 

 Those deserving most consideration are (1) the relations of 

 the Mentor sands to the Kiowa shell beds, (2) the chronologic 

 and systematic relations of the Dakota to the Comanchean 

 strata, and (3) the former eastern and present western ex- 

 tent of the Kiowa shell beds and the Mentor sandstones. 



In respect to the first problem, it appears quite probable 

 that the basal deposits of the Comanchean are nonmarine. 

 The shell beds are certainly marine. The shales and sands 

 which follow are quite probably nonmarine, while the fos- 

 siliferous Mentor sandstones are assuredly marine. Deposi- 

 tional conditions leading to such a sequence would be present 

 on an area undergoing slow subsidence — subsidence so slow 

 that the land waters by infilling could essentially keep pace with 



