MARYLAND GEOLOGICAL SURVEY 95 



recognized. No continuous well-exposed section of these strata was noted 

 in Maryland, and the section repeated below is one, published by Ulrich 

 and Stose, 1 of the northern continuation of the formation in southern 

 Pennsylvania. This section is broken and probably incomplete 480 feet 

 beneath the base of the overlying Stones Kiver limestone. If the Turri- 

 toma zone which was not observed is present in this basin, it may have 

 been faulted out or is concealed by covering soil and debris. However, it 

 has been recognized in the southern continuation of the belt in Maryland. 



Section of Beekmantown Limestone near Mouth of Licking Creek, 

 Franklin County, Pennsylvania 



Feet 



Interbedded pure and magnesian limestone of Stones River type 



Light-gray, finely laminated magnesian limestone and white dolomite 



with cherts of rosette type at the top 340 



Dark and light coarse dolomite 140 



Rocks folded and largely covered; white dolomite, dark-blue oolitic lime- 

 stone, and dark coarse dolomite with yellow blocky sandstone frag- 

 ments and rosette cherts; exact continuity indeterminable, but the 

 previous beds are apparently repeated by folding 



Interbedded pure and magnesian limestone, with beds of coarse dark 

 dolomite, and in the lower part beds of " edgewise " conglomerate; at 

 base contains Ceratopea gastropods, cephalopods, and trilobites 350 



In large part finely banded magnesian limestone with few pure lime- 

 stones; contains fine conglomerate beds and gastropods 170 



Largely dolomite, some coarse and dark; large scoriaceous black chert 



and coarse sandstone at the base 130 



Chiefly dolomite, coarse and dark in upper part, with some pure fos- 

 siliferous limestone; bed of granular limestone with numerous 

 Ophileta and pinkish fine-grained limestone near middle; cross- 

 bedded banded limestone at base, locally unconformable on under- 

 lying beds 290 



Fine-grained limestone seamed with calcite and dolomite beds with flinty 



chert containing Cryptozoon steeli at the base 65 



Partly covered; lower part pure dark limestone with a few beds of finely 

 laminated magnesian limestone and fine white oolite near base; small 

 rough chert with casts of crystals at the base 130 



Light-blue limestone with fine contorted sandy laminae that weather in 

 relief; contains fine dark conglomerate with red limestone pebbles 

 and fragments of trilobites 165 



Purer fine even-grained limestone with few sandy partings 530 



Sandy laminated limestone, much contorted (Conococheague) 



2310 



1 Chambersburg-Mercersburg folio U. S. Geological Survey. 



7 



