Douglass: Geoi.ckiv of Southwestern Montana. 417 



Poteriocrinits hozemaneiisis Miller. 



Potcriocrinus douglassi Miller." 



Platycrimts bozeinanciisis Miller. 



Platycrinus bridgercnsis Miller. 



Platycrimis doi/}^lassi Miller. 



Rhodocriniis bozemanensis Miller. 



Rlwdocriniis bridgerensis Miller. 



Rhodocrinits douglassi Miller. 



Ritsophycus i/iontaiieiisis Miller. 



Miller assigns the strata containing these fossils to the Burlington, 

 or Keokuk. The strata here are nearly vertical and are extremely 

 fossiliferous. Some slabs are covered with Brachiopods and Bryozoa. 

 Three of the new species of crinoids, Rlwdocriniis douglassi, R. 

 bozemanensis and R. bridgerensis, were found on one small slab. 



Old Baldy Mountain. — In the 6th Annual Report of the United 

 States Geological Survey of the Territories on pages 468-470 a list of 

 Carboniferous fossils from Old Baldy Mountain is given, but there 

 is no distinction of horizons. Last summer I made collections from 

 the Madison laminated limestones on the north escarpment of the, 

 and in the more thickly bedded limestones much higher on the 

 southern or southeast slope of the mountain. The collections were 

 kept separate. They were submitted to Mr. Percy E. Raymond 

 of the Carnegie Museum who furnished lists which I give below. As 

 stated before, the Cambrian, the lowest member of which is a cjuart- 

 zyte, rests here on the north escarpment of the mountain, directly upon 

 the Archaean gneiss. Above this are Cambrian shales. Above these 

 there are limestones which are mapped on the Three Forks Folio as 

 Cambrian and Devonian. I do not know that fossils have been 

 found in the Devonian, but Mr. DeMors, a geologist and mining 

 man, told me he had found Cambrian fossils here. Above these 

 beds are the thin-bedded limestones of the INfadison division of the 

 Carboniferous. Field No. 133 came from here. 1 did not have time 

 to make a large collection, and the higher beds seemed of more 

 importance. Field N'os. 134, 136, 137 and 138 came from these 

 upper beds. In the latter besides a considerable invertebrate fauna 

 there are fragmentary vertebrate remains (principally fish teeth, etc.), 

 which have not been studied. I copy below Mr. Raymond's lists 

 with his oi)inions as to horizons. 



6 I am not certain, but think the locality of one of these species of /'ofiriocriinis lias 

 been wrongly assigned and was found at Logan. 



