15 NEW YORK STATE MUSEUM 



house, and then by following the gully east of the road for two or 

 three hundred yards. The ledge occurs on the east of the gully about 

 3 or 4 feet below the base of a stone wall that separates the gully 

 from an old orchard on the east. The fossils occur in the hard com- 

 pact quartzite similar to that in Ladue's yard, buu are most numerous 

 in the thinner, somewhat friable rusty layers just beneath. The 

 compact rock shows dull imperfect surface markings and 

 numerous rusty spots when broken. The friable layers show 

 great numbers of fragments including brachiopods resembling 

 Obolella and the spines and cheeks of trilobites identified as 

 Olenellus sp. ?). 



The basal quartzite passes conforma1)ly into a bluish gray 

 fossiliferous limestone in the orchard of Ward Ladue and north 

 of here on the farm of William L. Ladue the limestone grades 

 upward into calcareous shale thus giving a conformable series 

 of Lower Cambric strata. Just what the relation of the lime- 

 stone further north is to this series, it is very- difficult to deter- 

 mine. The Lower Cambric is probably faulted up into younger 

 limestones. 



Wappinger limestone. This formation occurs within the quad- 

 rangle in two well defined masses : the composite Wappinger creek 

 belt and the Fishkill limestone. 



A portion of the former was reexamined during the past 

 summer for the purpose of learning more about the cherty 

 dolomitic limestone overlying the arenaceous beds carrying 

 L i n g u 1 e p s i s cf . p i n n i f o r m i s in the western strip of this 

 composite belt. Apparently the latter beds grade up into the 

 dolomitic rock. The latter does not appear to bear much 

 resemblance to the so called " Calciferous " of the central strip 

 of this belt as developed at the type locality at Rochdale. Pass- 

 ing westward along the Spackenkill road from the Albany post- 

 road one crosses the gently inclined or horizontal Upper Cam- 

 bric beds at points near Ruppert's farmhouse and just a little 

 east of this place, and then over very different cherty strata 

 without fossils in which the stratification and dip are not dis- 

 tinct. The two, however, appear to be in conformity. Near 

 Camelot station the arenaceous Potsdam beds appear pitching 

 to the southward and south of here at the Clinton Point Stone 

 Company's quarry at Stoneco are strata very similar to the 

 cherty beds just described, with westward dip and such general 

 position as to indicate that if continued northward they would 

 have a position with reference to the Upper Cambric like that 



