240 NEW YORK STATE MUSEUM 



Feet 



o — i3=Water 



13 — 46=Black river mud (mostly river silt) 

 46 — 48=Sand with decayed wood (peaty wood) 

 48 — 7o=Quartz and garnet sand rather clean (glacial) 

 46 — 7o=Lumps of peaty matter coming to the surface at inter- 

 vals indicating occasional small layers of peat 

 (glacial) 

 70 — 78=Mixed sand (glacial) 



92 =A core of Triassic contact shale (a drift boulder from 



the Palisade margin). At this point also a piece of 

 Manhattan schist (boulder) 

 95 =4 pieces of diabase (Palisade trap) from another drift 



boulder 

 9^-5 =5 pieces of Inwood limestone (boulder) followed by a 

 piece of quartzite and several mixed pebbles indi- 

 cating glacial drift origin 

 114 — ^II9^=A bufif yellow sand with much pearly yellow mica flakes. 

 Effervesces with acid. This shows no foreign matter. 

 It is chiefly residuary decayed rock in place and repre- 

 sents silicious and micaceous limestone. It is decayed, 

 very impure, Inwood limestone 

 119 =Clay with pieces of flinty quartzite, probably from a 



small quartzose seam in the limestone 

 120 — i26^Light flaky yellow material. Much pearly mica with 

 earthy matter. Effervesces in acid. Residuary from 

 Inwood limestone 

 128 =White and drab lumpy residuary matter (kaolin) and 



earthy substances. Effervesces. A more impure In- 

 wood. Also shows several pieces of core of a porous, 

 rotten limestone. Inwood 

 129 — i34=Reddish brown lumps. Effervesces a very little. 

 Mostly clay but still no foreign matter. Residuary 

 material from a more silicious bed. A few pieces of 

 hard, impure limestone at 133 feet 

 134 =Pieces of a porous quartz chlorite rock with little lime. 



Is a leached quartzose rock evidently a sandstone 

 layer in the limestone. Rock belongs to the Inwood 

 formation 



