112 



KANSAS UNIVERSITY QUARTERLY. 



5. Light red clay 2 in. 



6. White, sHghtly indurated sandstone 6 " 



7. Shale, reddish, changing to purple 4 ft. 



8. White, fissile sandstone 6 " 



9. Arenaceous clay of a dull red color 10 " 



10. White, laminated arenaceous limestone containing fossils 6 in. 



This last stratum contains a characteristic Jurassic type, Pseudo- 

 ryionotls curta Hall. This is the first or lowest known fossil-bearing 

 horizon of the Jura. Any division line i^laced between the Red Beds 

 and the Jura lower than this fossiliferous statum would be an arbi- 

 trary one, as there appears to be no unconformity to mark their 

 separation. 



The term Jura-Trias, which has so long been applied to these beds, 

 is no longer applicable, for the reason that the Jura is well differ- 

 entiated by its faunas. This is true not alone of the Jura of this 

 region, but it is also true of the formation everywhere in the West. 

 The series of beds, however, which lie between the known Carbon- 

 iferous and the Jura, and which constitute the Red Beds proper, 

 might, in the absence of any means of differentiation, 

 be called the Permo-Trias. 



The Jura. Continuing the section already be- 

 gun, we have, for number 



11. Arenaceous clay of a somewhat shaly nature. . . 6 ft. 



This layer contains, near the central portion, a 

 more highly arenaceous stratum of a greenish color. 

 It has scattered through it, also, at different levels, 

 some rather large, browm, argillaceous concretions. 

 The entire stratum seems to be unfossiliferous. But 

 it may contain Belemnites densus, as it is often diffi- 

 cult to determine whether this fossil does or does not 

 belong to the lower beds, since, on account of its abun- 

 dance in some of the upper beds, it is scattered su- 

 perficially throughout the full extent of the outcroj). 



12. White, sandy clay 4 ft. 



No invertebrate fossils were found in this stratum, 

 but the remains of marine saurians belonging to the 

 genera Ichthyosaiints and Pleslosauras occur in con- 

 siderable abundance. 



13. Purplish fossiliferous clay containing calcar- 



eous nodules 20 ft. 



The most abundant fossil in this stratum is Belem- 

 nites denstis, which occurs distributed throughout 

 the layer, while the other fossils are confined chiefly 



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