The district at hand is one somewhat remote from any known field of productive Coal Measures, but being Upper Carboniferous in age is a region to which considerable geological and economical interest has been attached. There has always been an anticipation of finding heavy fuel veins, but as yet these looked-for strata have not been positively located. Reports, often manufactured, and the meeting of thinner veins of coal, have led to the increased expectations now prevalent in the district.
Proceedings of the Iowa Academy of Sciences
©1894 Iowa Academy of Science, Inc.
Lonsdale, E. H.
"Upper Carboniferous of Southwestern Iowa,"
Proceedings of the Iowa Academy of Science, 2(1), 197-200.
Available at: https://scholarworks.uni.edu/pias/vol2/iss1/41