318 



GEOLOGY. 



Section in New Jersey. 1 



Names of Formation. 



Manlius limestone . . . 



Rondout limestone. . 



Decker Ferry forma 

 tion (Cobleskill 

 limestone) 



Bossardville limestone 

 Poxino Island shale. . . 



Medina sandstone. 

 Shawangunk con- 

 glomerate. 



f Probable unconformity 

 g Hudson River slates . . 

 S Trenton limestone. . . . 



•% I Unconformity. 



q | Kittatinny limestone 

 [ (mainly Cambrian). 



Thickness 

 in Feet. 



35 

 39 



52 



100 

 ? 



2305 

 .500-1600 



1165 

 135-150 



2700-3000 



Characteristics. 



Thin-bedded, knotty, dark-colored limestone. 

 Earthy and calcareous shales and limestone. 



Sandstones with calcareous bands, and lime- 

 stones with shaly bands. 



Fine-grained, compact, bluish-gray, banded. 



Buff or greenish, calcareous; irregularly 

 bedded; layers thin. 



Soft red, somewhat shaly sandstone. 



Coarse quartz conglomerate; pebbles usu- 

 ally white or yellowish, with gray or red 

 matrix 



Shales, slates, and some sandstone. 

 Limestone, often conglomeratic at base and 

 shaly above. 



Dolomitic; at one locality the top of the 

 formation contains Ordovician fossils. 



Section in Western Maryland. 2 



Names of Formations. 



Thickness 

 in Feet. 



Characteristics. 









Sandstones, shales, and limestones. 







700 

 300 



550-600 



250-300 

 550 



Sandstones predominate in lower and lime- 

 stones in upper portions. 



Limestones with shale partings; thin sand- 

 stone beds near the top; shales predominate 

 over limestone at the top. 



Thin reddish and greenish-yellow shales, with 

 sandstone beds, and in the upper part a few 

 thin beds of limestone. 



Snow-white to light-gray quartzite, frequently 

 cross-bedded. 



Dull-red sandstones and shales, interbedded 



"S J 



Clinton 



Tuscarora. „ . . . ..... . 







irregularly; shales predominate. 



1 Weller, Geol. Surv. of New Jersey, Report on Paleontology Vol. Ill, 1903, pp. 

 15-80. 



2 Prosser, Jour, of Geol., Vol. IX, pp 410-415 



