80 ENVIRONMENT OF VERTEBRATE LIFE, ETC. 



There follows in plate 1 1, opposite page 26, a series of graphic representa- 

 tions of drill-holes in the McLeansboro in district vi and Shelby County 

 and a detailed record of a single hole, which show the absence of red shale 

 and sandstone and prevalence of black, blue, and gray colors. 



In district vi the following are the most well-marked of the horizons 



above Coal 6. 



7. New Haven limestone 

 6. Shoal Creek limestone. 

 5. Carlinsville limestone. 

 4. Coal No. 8, 8 inches to 2 feet. 

 3. A bed of pink, red, or variegated 

 shale, variable in thickness, seldom 

 exceeding 15 feet (local). 

 2. Coal No. 7, generally only a few 



inches thick. 

 I. A hard limestone averaging 7 feet 

 in thickness, overlying and slightly 

 above Coal No. 6. 



Most of these horizons can be recognized in district vi, but not all, and 

 there are some in district vi not occurring in vii. Layer 3 is not present in 

 district VI. The limestone directly above Coal No. 6 bears marine inverte- 

 brates. 



" Of the remaining 400 feet, more or less, of the McLeansboro formation (above 

 the New Haven limestone) known from drilling in this district, only the lower 

 300 feet or so has been explored by the drill a sufficient number of times to warrant 

 generalizations in regard to it. * * * Most of the material above the New 

 Haven limestone is shale and sandstone with no characteristic beds." 



One bed of coal less than 5 feet thick and lying about 550 feet above 

 Coal No. 6 is mentioned in a number of well records. 



The nature of the beds in the McLeansboro formation appears to the 

 author a confirmation of his position long held, that the reptilian and 

 amphibian remains found near Danville, Vermillion County, Illinois, occur 

 in deposits of a much later date than the beds with which they are associated. 



The McLeansboro formation of Illinois is equaled in Indiana by a few 

 hundred feet of shale and limestone with a few thin coal beds. Ashley^ 

 has divided the upper Pennsylvanian of Indiana, as shown in the correlation 

 table, opposite page 48. 



On page 59 of Ashley's report cited above, it is stated that in a general way 

 the coals and rocks above coal vii in Indiana belong to the Conemaugh and 

 higher formations of Pennsylvania. With the exception of limestones above 

 coal VII there are only shales and sandstone, with clays just above the coals: 



"There is no dominant sandstone except one above what may be called 

 coal IX, which is believed to be the sandstone outcropping at the top of the bluff 

 at Merom, and from this exposure has been called the Merom sandstone. 



' Ashley, G. H., Supplementary Report on the Coal Deposits of Indiana, 33d Annual Report 

 Department of Geology and Natural Resources of Indiana, 1908. 



