MARYLAND GEOLOGICAL SURVEY 77 



composed of slender fragments of limestone tilted at all angles in a 

 matrix of limestone distinctly different in composition. 



The general nature of the strata composing the Conococheague lime- 

 stone is shown in the type section near Scotland, Pennsylvania, published 

 by Stose. The continuity of this section is known to be interrupted by 

 small faults and folds. Although allowances were made for these, the 

 section, as finally compiled, is scarcely to be considered as entirely satis- 

 factory. The total thickness may be greater than given. 



Section of Conococheague Limestone West of Scotland, Pennsylvania 



Feet 



Rather pure light-colored limestone, much sheared, followed above by 

 siliceous banded dark limestone and " edgewise " conglomerate 

 (Stonehenge member of Beekmantown). 

 Granular limestone with coarse " edgewise " conglomerate, oolite, and 



fine-grained pink marble, with numerous slaty partings 90 



Covered .- . . . 300 



Pure dove-colored even-grained limestone interbedded with light 

 siliceous-grained cross-bedded limestone, coarse " edgewise " con- 

 glomerate, and chert 15 



Largly covered : dark impure limestone with large banded chert at the 



base 390 



Dark and light limestone, in part banded with impurities 10 



Dark, rather impure limestone with argillaceous partings weathering 

 to slaty fragments and soft yellow shale; contains trilobites and 



beds of oolite 180 



Dark limestone with shaly partings on weathering 90 



Massive beds of light, dense, even-grained limestone with few wavy 



siliceous partings weathering in relief 40 



Covered 70 



Wavy impure siliceous banded limestone, weathering hackly and shaly. 180 



Dense black impure limestone, weathering with thick gray coating 30 



Thick massive beds of crumpled siliceous banded limestone 40 



Section folded and discontinuous. Dense siliceous banded limestone, 

 with sandy beds, oolite, " edgewise " conglomerate, and layers of 

 Cryptozoon at the base ' 200 



1635 



The exposures of the Conococheague limestone in Maryland are too 

 discontinuous to allow a complete section to be taken at any particular 

 locality. The following general section gives the sequence of these rocks 

 east of the Martinsburg shale belt of the Valley. 



