Some evidences of shrinkage of certain Illinois coal beds since their burial

Call Number: 
MS Cady, G.H. #43
Author: 
Cady, Gilbert Haven,
Date: 
1935
Description: 
12 p.
Notes: 

Evidences: (1) shapes of gray shale lenses; "rolls," "white top" (2) variations in interval due to thickness variation (3) sandstone cut-outs (4) "horse-backs.";
Cited in Circular 201, "Unpublished Reports on Open File";

Keywords: 

Coal
Shrinkage

 

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