LOWER SILURIAN SYSTEM OF EASTERN MONTGOMERY CO. 461 



F^® Uneven, dark, compact, fossiliferous layer 

 with crystalline lenticles^ the fossils mostly in the 

 lenticles. i'= 48' 



F^ Dark blue, fine grained layer with crystal- 

 Hne fossiliferous lenticles which by weathering 

 darker and yellowish give a mottled appearance 

 to the weathered surface. i' 2''=^ 49' 



F^ Grayish blue, crystalline, fossiliferous layer. 4" 



F^ Dark blue, fine grained with crystalline len- 

 ticles and weathering as in no. 11. Fossiliferous. i'4''= 51' 



F^* Medium light colored, weathering with yel- 

 lowish streaks as in no. 11. Abounding in Trenton 

 fossils. 2'= 53' 



F^5 Thin irregular, dark blue, fine grained layers 

 with intercalated very black carbonaceous shale, 

 contain great numbers of fossils specially M o n - 

 ticulipora (Prasopora) lycoperdon 

 Say, and Trinucleus concentricus 

 Eaton. ' 27'= 80' 



F^^ Utica shale exposed in creek bed, in con- 

 tact with Trenton. Covered to first creek east of 

 Morphy creek. 27o'=35o' 



F^^ Black strongly calcareous slaty shale con- 

 taining veins filled with calcite and occasional 

 compact fine grained layers with conchoidal frac- 

 ture. 5o'=q4oo' 



F^s Covered. 40'=44o' 



F^^ 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. 6o'=5oo' 



F^o Fragments of shale in soil of hillside, be- 

 coming specially abundant in knoll on northeastern 

 declivity. i8o'==68o' 



F^ Top of Adebahr hill. Black crumbling, cal- 

 careous shale, with thicker compact layers, ex- 

 posed in open pasture on southern brow of hill. 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 



