DESCRITTIVE NOTES OF (^UAKRV DISTRICTS AND (QUARRIES 265 



the varigated stones. At the extreme north-east the Noble 

 & Lyle quarry produces a reddish-brown stone which is more 

 like the Hulberton stone, and is rather softer than that of the 

 quarries to the west and south-west. It is used for building 

 almost exclusively. In this quarry, and in some of the 

 others, a red, shaly rock, known here as " red horse," is 

 found under the quarry beds, which is waste, The dip is 

 south at a small angle ; a regular system of vertical joints 

 runs an east-west course, with a north-south system, less well 

 defined. The total thickness of quarry beds is in places as 

 much as thirty feet, and the range is from two inches to six 

 feet. The larger part of the aggregate production of these 

 quarries is put into street material. The chief markets are 

 Syracuse, Rochester, Buffalo, Erie, Cleveland, Columbus 

 and Toledo, Detroit, Milwaukee, and as far west as Omaha 

 and Kansas City. 



Lockport. — Quarries in the Medina sandstone formation 

 were opened near the town, to the north, as early as 1824, 

 and much stone was put in buildings, which are good exam- 

 ples of its durability. The quarries are on the right bank 

 of the Eighteen Mile'creek, and are connected with the 

 New York Central railroad by a branch road one mile in 

 length. Stone for flagging, paving blocks, and for building 

 is obtained. Gray, red and mottled varieties occur in these 

 openings. Formerly these quarries furnished stone to out- 

 side buyers ; at present, they are worked almost exclusively 

 for the local market. 



Lewiston, Niagara County. — The same formation has af- 

 forded some building, and some flagging-stone at this 

 locality. 



Hamilton and Portage Groups 



Hudson River Blue-stone 



The term ''Hudson River Blue-stone" is used to desig- 

 nate the blue, fine-grained, compact and even-bedded sand- 

 34 



