158 The A?nerica?i Geologist. March, i9oi) 
argillaceous shale. Medina 
30 2.330 Fine quartz grains mostly 
reddish, but some green- 
ish-gray. Medina 
31 2,350 Mainly fine quartz grains, 
about one-half reddish 
and the other greenish- 
gray. A little bluish 
argillaceous shale. Medina 
32 2,380 Mainly fine quartz sand, 
partly a faint reddish tint, 
but possibly more of a 
greenish-gray. A little 
greenish to bluish-gray 
argillaceous shale. Trans- 
itional from the Medina 
to the Oswego sandstone. Medina 
33 2,400 Ditto, except that the red- 
dish tint is very faint, the 
greenish-gray predomin- 
ating and there is more 
greenish and bluish ar- 
gillaceous shale . Medina 
34 2,450 Mainly greenish-gray, sili- 
cious ss.; some of the 
quartz grains have a faint 
pinkish tint and there are 
a few chips of reddish ss. 
35 2.500 Ditto, but with more pink- Medina 
ish quartz grains and 
chips of bluish and 
greenish argillaceous 
shale than No. 34. Medina 
36 2,515 Greenish-gray ss. ; some of 
the quartz grains with a 
slightly reddish tint. Medina 
37 2.560 Coarser chips of greenish- 
gray silicious ss., scarcely Oswego 
any of reddish tint. sandstone 
38 2.590 Ditto, but chips are finer 
and part of the quartz 
sand is simply a light Oswego 
gray color. sandstone 
39 2,600 Coarser chips of greenish- 
gray silicious ss., and 
some dark to bluish-gray Oswego 
chips. sandstone 
