ELIE RISE ee eT es centeine o ~ -_ =. 
Cave in the 
Singuear conformation of Limestone. 19 
eomposed of a kind of quartzose sand, of a gray or reddish 
gray colour, and is possibly a variety of the miil-stone grit 
of the canal district. Shell lime rock occurs in great 
abundance in the vicinity of the Oolitic series, but its rela- 
_ tive position, in reference to this formation, I am not at 
present able to determine. 
Since writing the above communication, I have been 
highly gratified by an interview with Mr. Schoolcraft, who 
informs me that Oolite actually occurs in Munroe township, 
Gallatin county, Illinois, near the Ohio, four miles west of 
Roc in masses, and, descending 
into some of the old diggings, made for the urpose of 
procuring lead, he found it in situ, regularly stratified. Mr. 
Schoolcraft thinks, fe. e observations which he was 
able to ole that this Oolite Sat on calcareous sand rock 
and is overlaid by shell li 
Sara ansaid Nes. eth, 1824, 
tT. 1V —Notice of a Singular conformation of Lime- 
— ie Pro. Dewex 
In blasting the eneks near the College, a singular con- 
formation of limestone has been exposed to view. It be- 
longs to the bed of limestone, sb ig contains a consider- 
ta, shown by the ost A B, (see ve it) i is about 40° and 
the dip is towards the east. ‘he section shown on the 
plate, is nearly at right angles to the direction of the strata, 
so that E W lies nearly eastand west. The strata, which 
lie upon A B, are divided by natural seams into lar Fe 
Commencing on these are several strata from one to eight 
inches thick, — are curved in the manner represented 
between Band W. ‘The outer strata have a larger curva- 
ture ; but the inner finally come to a point, as at C and 
the two parts forming the angle being clearly defined but 
closely compacted into a solid mass. At E is another 
