242 
ANTHRACITE COAL MEASURES. 
Tahle showing the Order, Character^ and Maximum Thiek" 
nesses of the Lower Secondary Formations of Pennsylv'a* 
nia, east of the Susquehanna. 
Coal Mlasures, consisting of seams of Coal, 
= dark shales, argillaceous Sandstones, and Sill- 
^cious Conglomerates. 
(Vegetable Fossils.) 
Silicious Conglomerate. 
Hed Shale. 
Thin calcareous Conglomerate 
■-"/^'•■f'/A Sandstone and Conglomerate. 
_ Red Shales, and Red, Gray, and Buflf-ool 
poured Argillaceous Sandstones. 
IX 
Coarse whi te Sandstone. (Cavities of fossils.) 
E::r5%Cr5^S^:23^£^3^£'-:s?3^^ Blue Argillaceous Limestone (fossils). 
Red and Variegated (fossil iferous iron ore). 
Shales and Sandstone (fucoides). 
(Roofing Slates.) 
Dark Slate and Argillaceous Sandstone.! 
( A few fossils.) 
Bed of Limestone. 
It 
Blue Limestone. 
Beds of chert. 
(A few fossils.) 
Compact White Sandstone. 
