64 PROCEEDIKOS OF THE ACADEMY OF [1894. 



have made to obtain tliem. As a trustworthy, amiable, and help- 

 ful man Maza proved himself to be an invaluable adjunct to the 

 party. We returned from Hump Creek on August 2d, and on the 

 way to the fort examined the escarpment of the Laramie at a point 

 further south than previously, and had greater success in obtaining 

 fossils. Altogether we obtained in the Laramie, bones of three 

 species of fishes and twelve species of reptiles; but no mammals or 

 birds rewarded our search. 



Our next points of investigation were the Upper Permian bad 

 lands of the Cimarron in Oklahoma, and such other outcrops of the 

 formation south of that river as should promise favorable results of 

 exploration. On our way thither we found ourselves, on August 10th, 

 at Sioux City, Iowa. Here we were courteously entertained by Mr. 

 John H. Charles, President of the Missouri River Transportation Com- 

 pany, He presented to the Academy portions of the vertebral 

 eolumes of two species of Plesiosauridio, from the Pierre formation 

 of the Upper Cretaceous, which were new to science, and which I 

 have described in the Proceedings of the American Philosophical 

 Society as Enibaphias eircnloxus and Elasmosauriis inlermedivs. On 

 an excursion along the bluffs bounding the valley of the Sioux river 

 we observed the eastern extension of the Niobrara Cretaceous lime- 

 stone and chalk, and the superimposed loess. 



In the absence of a good point for fitting out an expedition for the 

 explorations on the Cimarron River, we went to Fort Supply, a con- 

 siderable distance to the southward of it. We were there entertained 

 by the officers of the post, especially by Captain William Ahman 

 and by Lieut. Fox. The officer in conmiand, Col. Daingerfield 

 Parker, very kindly gave us the use of the post ambulance, and by 

 this means we were enabled to make a pretty complete examination 

 of the neighborhood during the days of our sojourn. Our first object 

 was to examine the red bluffs of Permian or Trias, which bound the 

 canyons N. and N. W. of the post, Avhich torm part of the drainage 

 system of the Cimarron. These bluffs we examined at various points 

 and for considerable distances, but without obtaining any traces of 

 fossil remains, excepting some fragments of wood. We found that 

 the formation which constitutes the higher levels at the heads of the 

 canyons tributaiy to the Cimarron, is an impure friable calcareous 

 limestone of evidently lower cretaceous age. We obtained from it 

 Exoyrjra texana and Gryplwa pitcherii with other species, which have 



