288 



If the limestone in section VI is to be correlated with the upper lime- 

 stone, it shows what is probably a littoral phase of the layer, which to the 

 west shows only deep water conditions. 



CONCLUSIONS. 



To briefly summarize, the Chester or Huron formation of western Mon- 

 roe and eastern Greene counties consists of three limestones with sepa- 

 rating sandstone and shale. 



Dr. E. O. Ulrich, of the United States Geological Survey, has examined 

 the lists of fossils given herewith and expressed the opinion that they rep- 

 resented the greater part of the Chester of Kentucky and southern Illinois. 

 As the stratigraphy seems to confirm this, the following correlations are 

 made: 



Upper (third) limestone. 

 Upper sandstone. 



Birdsville formation. 



Middle (second) limestone. 



Tribune Limestone. 



Middle sandstone. 



Cypress sandstone. 



Lower (fir.st) limestone. 



Lower sandstone. 



Oolitic upper portion of Mitchell. 



Ohara limestone member. 

 Rosiclare sandstone member. 

 Fredonia oolitic member. 



Ste. Genevieve 

 Formation. 



Remainder of Mitchell. 



St. Louis limestone. 



The line of division between the St. Louis and the oolitic above has not 

 been located in Indiana, but the latter is probaltly at least oO feet thick. 



