406 TRANS. OF THE ACAD. OF SCIENCE. 
Doris Sahdaton —This a comes next, and 
consists of thinly laminated quart andstone, passing 
ag. acer into thick-bedded spadacits aptivctinet 
the character of a coarse itstone, or even conglomerate wi 
rounded pebbles of silex and jasper. It is exhibited along 
the bluffs bordering the alluvial bottom of the Mississippi 
from a point about three miles from Ste. Geneviéve to the 
mouth of the Aux Vases. Near the upper end of the expo 
sure we find a thickness of about 40 feet resting on a lime- 
"GR Eero OS 
ity. 
ath the baba dare sandstone, we havea 
es limestone which, fe or the sake ae conve. 
eTL 
Wi poy suaas ts Hoetneoat kat 
ie noe meat eae : 
spi, commencing It is exhibited in the blufis of the Rist 
