﻿2 °0 NEW YORK STATE MUSEUM 



497~5 12 Core — a quartz biotite, feldspar schistose rock that is 

 rather easily disintegrated but does not show bad 

 decay. Resembles the Fordham formation more 

 than the Manhattan 



512-531 Disintegration sand and cuttings containing abundant 

 pearly mica 



53 J -547 Core. Many fragments of coarse quartzose and mica- 

 ceous limestone, interbedded type 

 c Ledge furnishing sound core 



558-559 Core from quartz vein 



573-58 8 Close textured quartz — feldspar — mica rock. Two 

 pieces with foliation structure at about 6o° 



597-607 Typical banded Fordham gneiss with good structure, 

 dip about 6o°, common black and white or gray and 

 white bands in good solid condition. Thin sections 

 and microscopic examination of the rock indicate 

 bottom perfectly crystalline, well interlocked, fo- 

 liated rock with constituents in good sound condition 



Summary of record and formation assignment 



Feet 



0-123 Soil and drift 



130-150 Residuary matter of local decay 



150-500 Ledge rock considerably decayed — micaceous schist pass- 

 ing into quartzose schist or gneiss mostly badly decayed, 

 but occasionally giving core 



500—531 Quartzose rock resembling the Fordham rather than the 

 Manhattan 



531-547 A quartzose limestone probably interbedded with the Ford- 

 ham 



558-607 Fordham gneiss, the lowermost part of which is very sound 



Discussion of meaning of this hole 

 There were three rather puzzling features about the data of this 

 hole at the time it was made: (1) The fact that Fordham gneiss 

 was penetrated at a point so far to the west; (2) the finding of a 

 small bed of quartzose limestone in the midst of other types ; (3) the 

 finding of both schistose rock closely resembling the Manhattan and 

 typical Fordham gneiss in the same hole with so little space 

 between. 



As to these points, the first one needs little comment. That is, it 

 seems to mean that much more of this Lower East Side ground be- 



