26 C. A. White on the Geology of Southwestern Towa. 
esting upon a bed of bluish, shaly, impure limestone which is 
salerrsd to the lower series. 4 
the Madison county section. It is numbered from the top down- | 
ward. . 3 
cag County Section. 
ER COAL-MEASURES. 
No.1. Thin bedded yellow Seen Piet - aes 1 
No. 2. up se marlite, = Oe 
No. 3. Gra assive limestone wih dull fracture, = o¥ 
No. 4. pi rigela rly bedded limestone —_ conchoidal 
fracture, ” 
No. 5. Black, lami seated, athunaanons en) - a” 
No. 6. Gray limestone with meat: patna Tike No. Pine 84" 
No. 7. Black shale like No. 5, 24 “ 
No. 8. Regularly. bedded gray Himestone with ‘many cherty : 
.__ layers, ae 
No. 9. Compact limestone on conoretionary structure,- 2 ” 
No. 10. Limestone of varying quality—in some parts silice- 
ous and some of the d terstitial ‘material micaceous 
and finely arenaceous, - a 108 © 
“* 
No, 11. Impure coal, = ee 
No, 12. Light blue marlite, - 
No. 13. Bluish, concretionary limestone, breaking ‘readily 
a ‘small 
* into Sas 
No.1, Bluish and reddish clays, - a ieee - 64 
: ~ sandstone in thin layers of bluish and rc i te 5 
ma LOWER COAL- 
No, 16. Blaieh, shaly, i poe! tae suspen sib hag isaac it 
No. 7. Bluish cla igen args, - - vr ig = 
ne “ 2 ‘ - ‘ ‘6 zi ee 
Total, 197 ft. 
ti is s considered —— that the members of the above seo- : 
ri, 
where the rocks of ths ole’ ich are more largely developed 
than in Iowa; but so far as these rocks of our own state have 
are based 
: servation in n Towa set should. fa ant ntcogial ai 
= | 
