231 Devonian of Southern Indiana 103 



most of the attempts to correlate the Indiana rocks with those 

 elsewhere fossils have played an important part since that date. 



In 1837 and 1838 D. D. Owen made a geological survej^ of In- 

 diana.* In Owen's Reportf published in 1839 all of the rocks in 

 Indiana below the coal beds were referred to what Owen called 

 the Sub-carboniferous group. This term was intended to indicate 

 their position "immediately beneath the Coal or Carboniferous 

 group of Indiana. ' ' Owen's Sub-carboniferous group was divided 

 as follows:;}: 



1 . Oolitic limestones. 



2. Silicio-calcareous series, with oc- 

 casional beds of clay. 



3. Black bituminous aluminous slate. 



4. Fossiliferous and inferior strata of 

 Sub-carboniferous Group, 'j the Sub-carboniferous group, 



consisting of ( 1 ) Fossiliferous 

 beds of the Ohio Falls; (2) 

 Waterlime and variegated strata ; 

 (3) Sand or burrstone; (4) Blu- 

 ish or brownish limestone. 



The Devonian series in Indiana and Kentucky is represented 

 in the above classification by number three and the first division 

 of number four. 



Owen correlated the Black shale at the base of the knobs in 

 Indiana with a shale in Ohio at "the base of the hills capped 

 with sandstone, bordering the Scioto valley." 



In the first Report of the Kentucky Survey || Owen modified 

 the use of the term Sub-carboniferous so that it included only the 

 rocks between the Coal Measures and the Black Lingula shales. 

 In this report Owen divides the beds below the "Sub-carbonifer- 

 ous limestone and fine-grained sandstones" as follows:*^ 



*Am. Jour. Sci., vol. 34, 1838, pp. 193-196. 



tReport of a Geological Reconnoissance of the State of Indiana. 



Jlbid, pp. 13-19. 



||Rept. K}'. Geol. Surv., vol. i, pp. 16, 17. 



nbid, p. 16. 



