REPORT OF THE STATE PALEONTOLOGIST 1002 1037 



than those of Mt Moreno, as noted by Davis. Beds of hard sili- 

 cions limestone are also found intercalated among the other 

 strata. Similar beds are met with on Mt Moreno. 



Contact between the " Hudson river series " and the Manlius 

 formation. This contact is everywhere a markedly unconform- 

 able one, the Hudson river strata being- much folded and trun- 

 cated by erosion before the deposition of the Manlius limestone. 

 The unconformity takes the place of the strata from the Medina 

 to the Waterlime of Buffalo inclusive, which apparently were 

 never deposited in this spot. The later Champlainic strata, 

 including the Lorraine, Utica and probably part of the Upper 

 Trenton, and perhaps also the Oneida conglomerate, were worn 

 away during the period of deposition of the Siluric strata west 

 of the Hudson. 



The actual contact between the Champlainic and Siluric 

 strata is shown only in a few places at Becraft. The most 

 important of these is at the outlet of the spring supplying th( 

 Hudson aqueduct. This is at the extreme northern point of the 

 mountain. The dip of the Hudson river strata here has not been 

 ascertained, but the cleavage planes stand vertical. The Man- 

 lius rests directly on the Hudson river strata. Another expos- 

 ure of the contact is on the old tramroad leading to the 

 quarries, a little north of the Jonesburg road. The strike of 

 the Hudson river beds is here n. 50° e. and the dip is 35° s.e., 

 the rocks being thin bedded and fissile. The Manlius is seen in 

 the upper part of the cliff, but much disturbed by frost action 

 and slipping, so that the precise character of the contact can 

 not be determined. The dip of the Manlius a little higher up 

 the cliff is from 10° to 12° eastward. A few exposures of the 

 Hudson river beds in the Ancram road south of this, allow the 

 approximate continuation of the contact line. 



The most continuous exposures of the Hudson river — Manlius 

 contact are found on either side of Fred. G. Lambert's farm, in 

 the hills facing faults 20 and 21 [see map]. Here 80 feet or 

 more of the Hudson river shales are exposed and the contact 

 can be traced on both sides for several hundred feet, though 

 general!} 7 the actual line of contact is covered. The Hudson 



