;-)<)<> 



Repokt of the Spate Geologist. 



are reached. To the south, too, everything is concealed. Much of this 

 covered territory must be occupied by the Potsdam. 



Calc/ferovx saixlrock. This formation is better shown as a whole in 

 Beekmantown than anywhere else in the comity. In the central portion of 

 the town, w ithin a radius of two miles from Beekmantown Corners, are many 

 exposures, the aggregate thickness of which must be very great. One mile 

 north of Beekmantown station, is the fossiliferous locality which lias been 

 described by Professor Whitfield,"- w here beautiful Ophiletas may be obtained 

 in abundance. The other exposures are of very sandy grey dolomites, some- 

 times passing into nearly pure white sandstone. All the Calciferous here 

 seems to belong to Divisions C and D, of Brainard and Seely.f 



Southward from Beekmantown village, a well marked ridge of Calcif- 

 erous dolomites runs southward, and is continuous with the Calciferous 



that lies west of the Beekmantown fault in Plattsburgh. The best exposures 

 are at the Poor-house. The fault passes into this township, but its course 

 has not been definitely traced. 



Exposwres along the Lake. Cumberland Head Series. The black slaty 

 limestones of this series extend into the township from Plattsburgh, and are 

 exposed along the shore of Tread well bay and thence westward for a mile. 

 The exposures form a series of narrow , sharp ridges, the topography resulting 

 rather from the slaty cleavage than from the dip of the rocks. The fossils 

 are the same as on Cumberland head. 



On the shore at Long point and to the northward, are similar rocks 

 They have so far furnished no fossils, and require further study, bift are 

 classed with the preceding provisionally, on account of the lithologic and 



* Bulletin American Museum Natural History, Vol. III., p. 2, 

 1 Bulletin American Museum Natural History, Vol. II., p. 18. 



