FIELD INVESTIGATIONS IN 1 92 1 829 



I do not know whether Weller has noted this fossiliferous bed between 

 the sandstones as here described. If he has and found the Platycrinus 

 and Pugnoides, two fossils that he has never believed to range above the 

 base of the Upper Ohara, he would most probably call this marly red and 

 green shale bed Lower Ohara and the sandstone under it Rosiclare. But 

 the latter is not the same calcareous sandstone that two to four miles 

 north of the Aux Vases bridge is regarded as including the Rosiclare and 

 which varies in thickness from 2 to 25 feet in the bluffs to the north and 

 south of Sainte Genevieve. Besides, if the marly bed between the two 

 sandstones were really Lower Ohara, then it would be lithologically very 

 different from any other representative of the Lower Ohara seen by me. 

 It would differ also very decidedly in its fossil contents. 



Nearly 20 years ago I observed and noted a section, now unhappily 

 partly covered by building operations, on the south side of the creek at 

 the southern edge of Sainte Genevieve in which the Rosiclare is but two 

 feet thick. Over this came 9 or 10 feet of fossiliferous calcareous red 

 shale and red limestone, and then a 10-foot bed of calcareous sandstone 

 that I believe corresponds to the sandstone of similar thickness and char- 

 acter that I have referred to as the Lower Aux Vases in the section on 

 the south side of the river of the same name. Moreover, in the latter 

 section also there is a hard calcareous sandstone or siliceous limestone 

 that similarly lies about 9 feet beneath the 10 to 12-foot sandstone and 

 which I regard as having the better claim to recognition as Rosiclare. 



Under the Lower Aux Vases sandstone, in the section on the south 

 side of Aux Vases River and separating its uneven base from the cal- 

 careous sandstone that I take to be the Rosiclare, is a bed, about 9 feet 

 in thickness, made up of red and green sandy shales and two 6-inch 

 ledges of sandy limestone. This bed also contains Platycrinus and Pug- 

 noides, but the latter includes, besides the typical form of Pugnoides 

 ottumwa, another with but a single plication on the fold and none in the 

 sinus. With these occurred part of the cup of Pentremites that has a 

 long pyramidal base, and, if we know the form at all, must be the same 

 or near Pentremites outtsi. The last has not been found beneath the 

 Upper Ohara in southern Illinois and Kentucky. The other fossils in 

 this bed, as may be seen from the following list, have no special signifi- 

 cance, being all of types occurring generally in Sainte Genevieve faunas. 



Fauna in top shale of Sainte Genevieve limestone. — The following 

 fauna is from red and limy shale (9 feet thick) at the top of the Sainte 

 Genevieve limestone. The locality is on Sainte Genevieve-Saint Mary's 

 road, half a mile south of Aux Vases River, Missouri. 



