REPORT OF THE STATE PALEONTOLOGIST 1901 541 



village, this rock is exposed to the mouth of the river. Thence 

 along the lake shore the Beekmantown is exposed in continuous 

 outcrop for f mile to the north side of Green bay where it is 

 faulted against the Potsdam sandstone. From this point the 

 Potsdam extends in continuous ledges along the shore for a mile 

 northward to Flat Rock point, which point is incorrectly marked 

 Jones point on the Willsboro sheet of the U. S. geological sur- 

 vey topographic maps. 



The thickness of the Potsdam shown here is about 135 feet. 

 The rock is in heavy and thin beds, many layers containing 

 pebbles of shale which on exposure to the atmosphere result 

 in the formation of cavities. Thin layers of greenish arenaceous 

 ehale are common. About the middle of the section is a layer, 

 152-A3, containing Lingulella and Obolella in abundance. No 

 trilobites were seen. 



This section seems to be about equivalent with the lower por- 

 tion of the Kent Falls section. 



Crown Point section 



A section was examined along the track of the D. & H. R. R. 

 near Burdick's crossing IJ miles north of Crown Point with the 

 hope of finding some trace of the Potsdam sandstone beneath 

 the lower layers of the Beekmantown. The search proved vain 

 so far as finding the Potsdam was concerned, though the lower 

 portions of the dolomite were found to be arenaceous. The sec- 

 tion is 130 feet thick, with Ophileta toward the top of the 

 series. An interesting intra-formational breccia occurs in the 

 lower part of the section and chert beds toward the middle. 



Summary of results 



The area covered by the sections above described is of small 

 extent when compared with that over which the Potsdam sand- 

 stone forms the surface rock to the north and northwest; the 

 results obtained can, accordingly, have little more than pro- 

 vincial value and the conclusions drawn must be of a tentative 

 nature till such time as they may be confirmed after field work 

 over the adjoining districts. They will, however, serve to in- 



