HIGH-GRADE SILICA MATERIALS II 



Junction, south of Beacon ; the only difficulty in transportation is a 

 haulage by wagon or motor, for a distance of approximately 3^ 

 or 4 miles, over a road fairly good for half the distance and excel- 

 lent the remainder of the way. No grades of any consequence are 

 involved. 



A normal fault of small throw, extending southwesterly and 

 beginning in the neighborhood of Mr Ladue's house, is the cause of 

 some difference in the quality of apparently adjacent beds; the 

 rocks on the eastern or downthrow side are slightly younger than 

 those on the western or upthrow side of the fault, and because of 

 this contain occasional thinner-bedded, impure fossiliferous layers. 

 With this fact in mind there should be no great difficulty in confin- 

 ing quarrying operations to the proper beds. The dip is gentle, 

 and the structure in general massive ; the ledges outcrop in a con- 

 spicuous manner, so that there is very little overburden to be 

 disposed of, presenting, so far as could be judged, favorable 

 opportunity for quarrying. 



The special uses for which this rock is suited will be mentioned 

 in part 2. 



THE SHAWANGUNK CONGLOMERATE (SILURIAN) 



General description. A comprehensive study of this formation 

 is a problem in itself ; no attempt was made to prospect extensively, 

 search being confined to a few localities where quarries are now 

 being operated, or w^here they have been operated in the past. 



The Shawangunk at Accord. In the vicinity of Accord, Ulster 

 county, the Lawrence brothers operate quarries in a small way, con- 

 verting the stone taken out into mill wheels of various sizes as the 

 demand arises ; Accord is the center of the quarry industry in this 

 locality. 



The quarries operated by the Lawrence brothers are situated 

 about i^ miles southeast of the village at an elevation of about 

 500 feet ; the rock here is in general a typical, fairly coarse conglom- 

 erate dipping very gently in a northwesterly direction, variable in 

 structure, texture and composition. 



The rock is not very heavily bedded, so that coarse conglomerate, 

 fine conglomerate, strongly laminated, highly colored, red and yellow 

 cross-bedded sandstone, pink conglomerate carrying numerous clay 

 galls, and conglomeratic quartzites of various colors, succeed one 

 another in short distances in exposed faces in the quarries, and in 

 crossing the beds. 



