338 ■ The American Geologist. December, i904. 
layer of shale in the 20 inch shale stratum of 
the southeastern wall and gradually increasing 
in thickness could be followed, before the 
bank was partly covered by talus, from this 
point to the northern end of the quarry's west- 
err' wall. The section of this zone on the east- 
ern bank is as follows : 5 inches thm sandstone 
to shale, i foot 5 inches light gray sandstone, 
10 to II inches dark gray argillaceous shale, 
I foot sandstone, 5 inches argillaceous shale, 
I foot 3 inches light gray sandstone and 8 
inches sandy shale to thin sandstone. This 
zone is shown in Fig. x where Mr. Wilkin- 
son's hand indicates its top while he stands on 
top of No. 10. 
10. A massive, fine grained light bluish sand- 3'6"i ^i'^" 
stone which is the most valuable stratum in 
the quarry, varying in thickness, as meas- 
ured on the quarried blocks, from 3 feet 2 
inches to 3 feet 9 inches, and the quarrymen 
report that it varies from 2 feet 6 inches to 4 
feet 2 inches in thickness. This layer is a valu- 
able freestone, and Mr. Leyndecker states that 
it received a prize at the Columbian Exposition 
at Chicago. 
9. Banks of the creek below the covered bridge 2Kdz' 7</8" 
show that this interval consists of dark gray 
shales alternating with sandstones, which va- 
ry from 5 inches to i foot 2 inches in thick- 
ness. This is a rather difficult interval to 
measure with a hand level and the results dif- 
fer somewhat ; but the writer recently made 
it 25 feet and his assistant Mr. J. A. Wilkin- 
(Son 27 feet 3 inches. 
8. Sandstone stratum i foot 7 inches thick, 10 4'8" 54'8'' 
inches shale and heavy bluish sandstone stra- 
tum 2 feet 3 inches thick at base. 
7. Gray somewhat arenaceous shale, and thin 4*2" 50' 
sandstone layers. 
6. A heavy layer of blue, iron-stained sandstone, 2'io" ^S'lo" 
which forms a small fall in the stream and a 
little below may be seen on its eastern bank. 
In the fall about 8 inches of the sandstone 
remains which is shown in Fig. 2. This ap- 
parently corresponds to the "City Ledge" 
in the Ohio cliffs near Buena Vista. 
5. Gray argillaceous shale, which is very soft and 5' 43' 
gritless. On the bank of the stream a little 
