SHUMARD—GEOL. OF STE. GENEVIEVE. 407 
' short distance west of St. Mary’s, and on the Saline, a mile or 
so above its mouth. 
The St. Louis Limestone, which next succeeds, is not as 
well developed as in St. Louis county, and it also differs some- 
what in physical characters. It is this rock that forms the 
cliffs along the gravel road above Ste. Geneviéve, and those of 
the ippi, till we get about three miles above = town. 
less 
oolitic, but i in a short distance they assume th pap ae of 
a heavy-bedded, gray nb a atian and present a thickness of 
oe to 100 feet. On Gabouri Cre ek, thi this formation pre- 
yails from. the mouth to a point about three miles above, 
where it is succeeded by a third Archimedes Limestone. At 
the oolitie quarries on the plank road, about two miles from 
Ste. Genevieve, we get the following instructive section of 
the lower beds of this formation: 
No. 1.—Slope strewn with chert, and some some masses of silicified _ 
Lithostrotion EL. mamm mammillare) + ees sete eee oH ee 50 feet. 
No. 2—Light gray waned ita limestone ‘containing Lithos- 
trotion and Archeocidaris +--- 60 “ 
Me, SeiBboige highly oolitic’ limestone with Lithostrotion, Ar- 
2 cic ates conoideus weet eee eee ee 20 nis 
