IV A VERL V GRO UP. 8 7 



zontal extension is much interrupted by incumbent drift deposits. 

 An artificial section through this shale formation is recorded by 

 Dr. Bennett, of Coldwater, and specimens from all the pumpings 

 during the progress of the boring were carefully saved by him 

 and kindly handed over tD me. The locality of the boring is a few 

 miles west of Coldwater, near Branch Station. The following de- 

 tails of the boring can be given : 



Drift 26 ft. 



Soft blue shales 177 " 



Hard blue shales, containing Crinoid stems 



and Chonetes 13" 



Soft blue shale 4 " 



Hard blue lime rock, with quartz i " 



Soft shale ' 10 in. 



Hard calcareous sand rock 10 " 



Soft sand rock •. . 4 " 



Water rising to the surface. 

 Hard calcareo-argillaceous sand rock, with 



many shell fragments 2 " 6 " 



Soft shale 2 " 



Pyritous shale 7 " 



Soft blue shale, with many shells 4 " 5 " 



Hard blue rock (lime rock) i " 9 " 



Soft blue shales 3 " 3 " 



Argillaceous hard lime rock, of blue color, 



with many shells i "8 " 



Blue shale 2 " 



Hard sand rock 2 " 8 " 



Soft shale with fossils 2 "10 " 



Hard calcareous sand rock, with shells, Cri- 

 noid stems, etc i " 



Shale and sand rock alternating, contain- 

 ing fossils and iron pyrites 33 " 



Hard blue limestone, with calcspar and py- 

 rites, shells I " 



Salt brine. 



Shale and sand rock, with shells 1 1 " 6 " 



Hard blue lime rock, with shells i "6 '' 



Soft blue shale, with seams of sand rock, 



pyrites, and dark bituminous particles. 22 " 



