SIXTH REPORT OF THE DIRECTOR I909 1 25 



Feet Inches 



18 Alternating beds of light gray, ^finely crystalline dolo- 

 mite and of more sandy, darker colored material; 

 midway is a heavy chert bed, with both black and 

 gray chert 12 



17 An irregular bed of light gray, finely crystalline 

 dolomite, laminated and weathering to finely lined 

 surface, filling irregularities in surface of preceding 

 bed ; i foot to 3 



16 Very nodular and irregular bed of gray dolomite, 

 with many sand grains and with cherty looking 

 plates of black, silicified sand ; 5 feet to 8 



15 Chiefly very light gray, calcareous, sand rock, but 



with alternating seams of darker colored dolomite. 10 



14 Light bluish gray, finely crystalline, drusy dolomite ; 



very few grains 2 8 



13 Very dense, fine grained, light colored, very sandy 

 dolomite, full of rounded grains of quartz sand; 

 many drusy cavities. 2 3 



12 Porous, very light gray, finely crystalline dolomite, 

 with many sand grains, and frequent green specks ; 

 many drusy cavities with quartz crystals in upper 

 portion 3 3, 



II Massive, gray dolomite, with many sand grains. ... 5 4 



10 Very fine grained, mottled, light gray dolomite. ... 2 6 



9 Dark gray, very quartzose, massive dolomite 8 



8 ]\Iassive, somewhat porous, dark gray dolomite; sand 

 grains fewer than in the beds beneath, but larger 



size 12 



7 Light gray, thin bedded, very sandy .dolomite, with 

 black streaks running through it; full of sand 

 grains ; one thin, hard, fine grained layer 4 feet 



above base 13 



6 Concealed, about 60 



5 Rather massive, porous, blue gray, crystalline dolo- 

 mite ; frequent crystalline nodules filled chiefly 



with calcite 4 10 



4 Massive, Cryptozoon reef layer; blue gray, porous 



dolomite with nodules of calcite 5 



3 Blue gray, porous, crystalline dolomite. i 4 



2 Concealed, about 25 



