E.. B. Andrews on a Seam of Coal. roT 
was flooded by more turbid water, which left a distinct earthy 
deposit. This thin slaty streak in the coal, now black and highly 
bituminous, is evenly distributed over a large area, and indicates 
a general overflow 
Another interest 
lowing these vegetable waifs to be floated in and lodged among 
the vegetation. But the water on which they were borne could 
have been only slightly charged with sediments, as no such sed- 
iments, with the exceptions of the extremely thin laminz pre- 
Viously alluded to, are found in the coal. I doubt whether these 
bits of drifted wood are to be found in the coal very far inland 
from the water edge of the coal marsh. I have not noticed them 
in the same seam of coal where it is mined, a few miles northeast of 
ear Creek. There is, moreover, evidence to show that the coal 
changes in character as it recedes from the water’s edge of the 
Original marsh. It becomes more soft and caking, and less like 
cannel in fracture and behavior in the fire. These facts are in- 
‘eXamined seams of coal in all parts of the Coal Measures, from 
the bottom to the top, as well as seams far apart geographically, 
and have invariably found the general direction of these planes 
the same. So confident have I become in this conclusion, that, 
