502 CHARLES S. PROSSER 
not so much of the upper part of the Bedford is exposed as on the 
southern bank. 
UPPER SECTION ON NORTHERN BANK OF SOUTH BRANCH OF SPRUCE RUN 
Total 
No. Thickness Thickness 
Feet Feet 
6. Berea sandstone-—Old quarries on upper part of 
bank containing buff-colored, rather fine-grained, 
quartz sandstone. Lower part of zone partly 
covered; but apparently continuous sandstone 
layers of moderate thicknessia4..5.0.) 92 -anee 25 
5. Zone composed in the upper part mainly of arenace- 
ous, blocky shale and in the lower part of contorted, 
buff, fine-grained, quartz sandstone. The con- 
torted or concretionary sandstone in general varies 
in thickness from o up to 3 ft. 3 in. and even to the 
entire thickness of the zone. The concretionary or 
contorted sandstone also occurs at different levels 
in the shale zone. At two places the concretionary 
sandstone extends from the top of the Bedford shale 
clear up to the base of the apparently continuous 
sandstones, in other words, occupies the full width 
of this zone. Again a little above the lower end of 
the bank the concretionary sandstone fails altogether 
and the rather blocky, arenaceous shales extend from 
the top of the Bedford up to the base of the continu- 
ous sandstone with a thickness of 63 it. There is a 
lithologic difference, however, between the Bedford 
and Berea shales on this bank, the Berea containing 
fine grains of quartz sand. The base of this zone 
is considered the base of the Berea which is separated 
by a line of disconformity from the subjacent Bed- 
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4. Bedford formation.—Zone composed mainly of blue, 
soft, argillaceous shale with an occasional thin, 
arenaceous lamina. The upper surface is uneven; 
but near the lower end of the bank the zone is 11 in. 
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3. Blue, very hard, compact, calcareous sandstone, 
weathering to a dark-brown color and becoming 
rotten, varying from 3 to 3¢ in. in thickness. This 
sandstone corresponds to zone No. 4 of the section 
on the southern bank, where it is from 4 to 5 in. 
thick; but with only from 2 to 6 in. of shale between 
itrand the base.of themberea- es. = es ee peer 
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