830 E. O. ULRICH CORRELATIONS OF CHESTER FORMATIONS 



Platycrinus penicillus — bases and columnals. 



Also numerous more or less worn plates and columnals of other crinoids. 



Pentremites sp. (A radical plate only, but of such a form that if it belongs 



to any known Sainte Genevieve or Ohara species it would have to be 



P. buttsi. 

 Bryozoa of the genera Fenestella, Polypora, Rhombopora, Batostomella, Steno- 



pora, etcetera — all too much worn for certain determination. 

 Pugnoides ottumwa White (especially abundant in top 2 -feet). Some of the 



specimens larger than usual. Two to four plications in sinus. 

 Pugnoides t sp. nov. Only one high angular plication on fold, none in sinus, 



and only one or two, the second obscure, plications on either side. 

 Spirifer leidyi. 

 Spirifer pellaensis. 

 Bellerophon — aff. suolwvis. Apparently same as one in the shaly bed of the 



Aux Vases sandstone 15 feet above. 



No such definitely Upper Ohara fossils as Talarocrinus dewolfi and 

 T. trijugis are known to occur in these late Sainte Genevieve and early 

 Aux Vases shaly beds in southeastern Missouri. The presence here of 

 such fossils probably would be accepted by all as establishing the age of 

 either or of both of these beds as not older than the Shetlerville stage of 

 the Ohara. At the same time it would leave no doubt as to the truth of 

 my contention that Pugnoides ottumwa, as well as Platycrinus hunts- 

 villa}, ranges upward beyond the base of the Shetlerville. 



Lower Chester section in Union County, Illinois. — Evidence of this 

 nature was found during the past summer in the section near Anna, in 

 Union County, Illinois, approximately 50 miles to the southeast of the 

 Missouri section just described. The Union County section is repre- 

 sented by the second column of the chart. Most of it was observed along 

 Swan Creek, from iy 2 to 2% miles east of Anna. The Fredonia or lower 

 member of the Sainte Genevieve is shown in a large quarry. Over the 

 quarry beds comes first a 10-foot shale bed with lenses of limestone. 

 This is followed by another 10-foot bed of calcareous sandstone that is 

 recognized by all of us as corresponding to the Rosiclare sandstone of 

 Hardin County. The Rosiclare is succeeded first by 12 feet of oolitic 

 limestone, representing the Lower Ohara, and this by 6 to 10 feet of red 

 and green shale with intercalated ledges and lenses of fossiliferous lime- 

 stone. The first of these limestone ledges is ferruginous and sandy and 

 in other ways suggests an agglomerate. This shaly bed is important be- 

 cause among its fossils we note the presence of bulbous plated calyces of 

 one or more species of Talarocrinus like and in part probably the same 

 as T. trijugis. Because of the presence of these crinoids, Weller has, and 

 probably does yet, refer this bed to his Renault formation. Certainly he 

 would not place it beneath the zone of the Shetlerville. In my opinion, 



