■ - 



Fig. 20. — Undulating solution seam, containing three-eighths 

 of an inch of black residual clay. This seam, within a 

 short distance to both the left and right, becomes highly 

 stylolitic. See Fig. 21. From a quarry of the Consoli- 

 dated Stone Company, Dark Hollow district, Lawrence 

 County, Ind. 



Fig. 21. — Stylolitic portion of the seam sho^Ti in Fig. 20. 



