THE NIAGARAN FORMATIONS OF WESTERN OHIO 357 



No, 



Thickness 

 Feet Inches 



13 



9-92 



3i 

 10 



base of the mottled zone and the top of the 

 Osgood shale is about the same in all three sec- 

 tions 



Laurel limestone.— The following courses all 

 have a bluish-gray color when seen on fresh 

 surface: 



Inc hesl 



Light-gray, compact course 6-7 



Light-gray, compact course 4~5 



Light-gray course, the upper part 

 blotched with dark-gray spots, but not 



many in lower part 8 



Shaly limestone parting i~i 



Light-gray, compact layer 8 



Light-gray course, with dark-gray spots 

 and bands which tend to split into 2 



layers 



Light-gray layer 



Very mottled light- and dark-gray, thin 



layer 



Light-gray layer 



Similar to above layer with a broken 



parting at base ° 



Bluish-gray layer with dark-gray streaks 



and spots ° 



The total thickness of the above layers varies 

 from 5 feet iof inches to 6 feet 2 inches. 

 [2. The three following layers are of light-gray 

 color with dark-gray spots, blotches, and 

 streaks and have about the same lithologic 

 appearance: 



Feet Inches 



First layer * 3 



Second layer IO 



Compact, massive layer containing 



calcite crystals 2 



n. Osgood beds.— Bluish-gray, soft shale 



forms the floor of the quarry. Six inches or 

 more are shown in the quarry. Mr. Robert 

 Mollett, foreman of the quarry, stated that at 

 the time of the March flood of 19 13 the shale 

 was shown by the side of the railroad track 



Total 



Thickness 



Feet Inches 



33 



6± 



1 

 which 



29 



23 



