WOOD COUNTY. 381 



No. 2. The same, except the dark and porous parts are lesd defi- 

 nite in form ; in one bed 2 ft. 6 in. 



" 3. Limestone; irregular; rather soft, drab, streaked with tor- 

 tuous bituminous films; sometimes fine-grained and 

 hard ; when quarried, comes out in blocks a foot thick ; 

 beds eight to twelve inches 3 " 



" 4. Sandstone; banded with blue, gray, and black streaks, 



owing to changes in sedimentation ; in three beds 1 " 



" 5. Limestone; even; drab, with bands of light and dark; 



beds four to six inches 2 " 



" 6. Irregular; hard and close-grained ; crystalline; of alight 

 drab, or yellowish-drab color; surface inverted kettle- 

 shaped 2 " 



" 7. Irregular; dark drab or brown; slightly fossiliferous ; 



arenaceous; vesicular 1 *■ 



" 8. Sandstone; in one bed; firm ; grains white, rounded, and 

 distinct. This bed contains occasional small masses or 

 pebbles of silicious rock, much larger than the ordinary 

 grains, due either to the chemical confluence of smaller 

 grains or to the existence of pebbles of that size in the 

 materials which at first formed the rock. So far as ob-* 

 served, they do not show the rounded condition seen in 

 the grains of the general mass 3 " 8 " 



" 9. Sandstone; light blue or lead color; its fine grains de- 

 posited in irregular, lenticular beds, and separated by 

 divisional planes in all directions. This is below the 

 falls caused by the last (No. 8), and the water runs strag- 

 gling over it. Thickness unknown. Exposed 1" 



Total exposed '. 18" 2 " 



The principal bed of the Oriskany here is No. 8, which is so persistent 

 as to run continuously across the river bed, causing, in a low stage of 

 water, a marked change in the river landscape. The unequal erosion of 

 the current on the materials composing this member of the section re- 

 veals the effect of currents of water operating in the act of deposition. 

 There are distinct lines of bedding, or oblique stratification, seen cross- 

 ing the main bed, the water having removed the softer parts, the whole 

 being rounded grains of sand. The following sketch will illustrate this 

 arrangement of the sand grains. It recalls very forcibly the oblique 

 stratification seen in the sand and gravel of the Drift of the present 

 day. 



