106 
IOWA ACADEMY OF SCIENCES. 
4. Specimen of the Gower phase taken from the quarry 
at Mount Vernon. Analyzed by Mr. E. A. Rayner. 
CaCOs 
MgCOs 
Fe-iOs and AhO 
S102 
54.02 per cent. 
44.73 
0.61 
0.29 
Total 99.65 
The rock is nearly a typical dolomite. 
5. The rock at the Palisades on the Cedar river, six 
miles distant from Mount Vernon, is similar in composi- 
tion to the Mount Vernon Rock. It is stratified, but not 
granular. Building stone occupies layers adjacent to 
others which are burned for lime. The specimen was 
analyzed by G. R. Greaves. 
CaCOs 53.64 per cent. 
MgCOs 43.89 per cent. 
FesOs and AI 2 O 3 0.52 
S 1 O 2 1.98 
Total 100.03 percent. 
6. This is of the same type as 3. It is a finely lam- 
inated building stone, but crystalline instead of granular. 
The specimen analyzed by Miss Herrinton is from the 
large quarries at Lime City. It is nearly a dolomite in 
compostion. 
CaCOs 55.3 per cent. 
MgCos 43.0 
Fe20s and AI 2 O 3 1.4 
SiOa 0.6 
Total 100.3 per cent. 
7. This is also a representative of the Gower limestone 
and of the LeClaire lithological phase. The specimen was 
taken from a ledge on Rock creek, two and a half miles 
southwest of Tipton. The ledge is notable for its excep- 
tionally high dip, reaching 70 0 . It varies but little from 
a true dolomite. The analysis was made by G. R. Greaves. 
CaCOs 55.76 per cent. 
MgCOs 43.85 
