LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 461 
F109 Uneven, dark, compact, fossiliferous layer 
with crystalline lenticles, the fossils mostly in the 
lenticles. 
FU Dark blue, fine grained layer with crystal- 
line fossiliferous lenticles which by weathering 
darker and yellowish give a mottled appearance 
to the weathered surface. 
Fl Grayish blue, crystalline, fossiliferous layer. 
F!8 Dark blue, fine grained with crystalline len- 
ticles and weathering as in no. 11. Fossiliferous. 
Flt Medium light colored, weathering with yel- 
lowish streaks as in no. 11. Abounding in Trenton 
fossils. 
F! Thin irregular, dark blue, fine grained layers 
with intercalated very black carbonaceous shale, 
contain great numbers of fossils specially Mon- 
freulapora (Prdsopora) Lycoperdon 
ee wand iwinuclhens.) comeentricus 
Eaton. 
F16 Utica shale exposed in creek bed, in con- 
tact with Trenton. Covered to first creek east of 
Morphy creek. 
Fl Black strongly calcareous slaty shale con- 
taining veins filled with calcite and occasional 
compact fine grained layers with conchoidal frac- 
‘ture. 
F18 Covered. 
FY Black, carbonaceous, calcareous shale with 
thicker compact layers in bed of creek and to first 
branch not far below the highway north of Adebahr 
hill. 
F*? Fragments of shale in soil of hillside, be- 
coming specially abundant in knoll on northeastern 
declivity. 
F*t Top of Adebahr hill. Black crumbling, cal- 
careous shale, with thicker compact layers, ex- 
posed in open pasture on southern brow of hill. 
— 48’ 
1”: 2""—== 40/ 
4” 
ig Ac 51f 
eset 
2h 80’ 
270’==350" 
50’==400/ 
40/440" 
60’—=500’ 
180’—680’ 
140’—=820’ 
The bench mark on the southern crest of Adebahr hill is 1062 
feet A. T. and*the level of the Mohawk river at the base of the 
