MARYLAND GEOLOGICAL SURVEY : 99 



ington and Prospect streets. The conglomeratic nature of the rock 

 is especially well brought out in the many stone embankments about 

 Hagerstown in which long exposure to the weather has emphasized this 

 and the laminated character. At the present time brick and concrete 

 construction have largely displaced this limestone as building material. 



Although the upper division of the upper Stonehenge is well exposed at 

 many localities in Maryland, perhaps the best places to study it in detail 

 are in the various railroad cuts around Hagerstown. The cut on the 

 Western Maryland Eailway one-half mile west of Bissel exposes the 

 characteristic edgewise conglomerate and the heavy, wavy laminae espe- 

 cially well. At this place, as well as at other localities around Hagers- 

 town, a few granular layers are found crowded with brachiopods and 

 poorly preserved gastropods. 



Seventeen species of fossils have been noted in the Stonehenge lime- 

 stone of Maryland and Pennsylvania. Following Ulrich 1 these have been 

 correlated with the Tribes Hill limestone fauna of New York. The same 

 fauna is found also in the upper part of the Kittatinny limestone in New 

 Jersey and in the basal or Stonehenge limestone division of the Canadian 

 in central Pennsylvania. The brachipod Dalmanetta wemplei Cleland is 

 found in abundance in certain granular layers, but other fossils are not 

 so common. The cephalopods are almost confined to reef -like structures 

 in the purer limestones of the lower half. The gastropod Ophileta com- 

 planata Vanuxem is found in both the lower and upper parts of the 

 member and it may be considered the characteristic fossil. 



Bepresentatives of one species of fucoid and 16 species of invertebrates, 

 including one brachiopod, six gastropods, five cephalopods, three trilo- 

 bites, and one branchiopod crustacean, have been found in the Stonehenge 

 member in Maryland sufficiently well preserved for specific identification. 

 Fragments of a few more species too imperfect for accurate determination 

 have also been noted. The gastropod Ophileta complanata is highly 

 characteristic of this part of the Beekmantown and the fauna may be 

 known as the Ophileta complanata fauna. The Stonehenge limestone 



1 Ulrich, Revision Paleozoic Systems. Bull. Geol. Soc. America, vol. xxii, 

 1911, No. 3, pi. xxvii; Ulrich and Gushing, Age and Relations of the Little 

 Falls dolomite N. Y. State Museum, Bulletin 140, 1910, p. 137. 



