DELAWARE COUNTY. 279 
its way to alower horizon in the formation. It is necessary to add, 
therefore : 
No. 8. (Seen above the bridge over the creek, east from Sunbury, and 
near Boyd’s qurrry ; also below the bridge at the top of the 
bluff, right bank.) Irregular, rough, full of oblique divi- 
sional planes, a and sometimes concretionary, 
AMO GUAM ALO CPMACSE Swen atinescesccteicatevecieesenaccsccecevesiecstiereds teese= eh Obmts 
““ 9. Regular beds of 2 to 4 fieneae. Sih dsemebatrelcecteeren sd ays tsetse Vane et ok 
‘* 10. Massive, or concretionary anid ee with eunene divi- 
sional planes, somewhat irony, with shaly deposits and part- 
° D> 66 
NIDSS), SISCIO 44046 dot cadligo anu babs abo SoUInbNSGobbE MaoIEtG ope Boo mouse aso gos barben ben 0 dla 
The shale sometimes crumbles out of No. 10, leaving the heavier stone, 
thus showing a tendency to caverns; but these holes are not of great 
depth, because of the unstable character of the rest of the rock. In some 
places No. 9 is entirely lost, and Nos. 8 and 10 unite, making a very 
rough and angular stone, with a thickness of twenty feet or more. The 
bed of the creek here is made up of irregular angular pieces, instead of 
flat, thin fragments, as at Mrs. Boyd’s quarry and above. This section, 
showing more or less of the beds of Nos. 8, 9, and 10, continues to form 
the bluffs of the stream as far down as the dam. A few rods below the 
dam the left bank is thirty-eight feet high, and is covered with a deposit 
of travertine, or carbonate of lime, from the top to the bottom. There 
is a flow of calcareous water over the bluff. This deposit is porous, and 
must have at least an average thickness of three feet. Pieces of that 
thickness have fallen down from the bluff. This carbonate has here no 
stains as of iron, noticed at Iberia, in Morrow county, although it occu- 
pies a similar situation geologically. This travertine has been burned, 
and is found to make a very white and strong quicklime. 
The origin of the calcareous water which deposits this travertine is in- 
volved in much doubt, there being no limestone in that neighborhood, 
nor near that geological horizon. 
Just below this travertine, on the same side of the stream, is John 
Landon’s quarry, situated a short distance above the mill. This contains 
. the base of the section of rough stone already given (Nos. 8, 9, and 10), 
-and shows as follows: 
No. 10. Additional to No. 10.. Rinse ia {sale ueae eee wr Onlbs 
“* 11. Alternations of beds OF nee Me adione of 2 ie 6 inches, 
and of good beds of solid stone of 6 to 20 inches. The 
individual layers of the slaty sandstone are not more 
(UMANA Ze Git Gay WaNGloy TWaMlke Pb Ags caneabooouosecsoo bos ooo bos Beaune eid | 2 ie 
MO Bil SHOES 180 Gos dab bob og0\850, 63H 646 COREE eS PEo OIC AAT Ena MeUMnOI nn ncaa”. SRN Gy i 
—— 
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* These partings of slaty stone between the heavy beds aid in quarrying. 
