6Q NEW YORK STATE MUSEUM 



tite much like that of the magnetite deposits. In fact magnetite also 

 occurs in this deposit. Remarkably large crystals of the constituent 

 minerals are developed here, including immense slabs of hornblende 

 and masses of pyroxene. This agrees well with the assumption of 

 igneous origin connected with pegmatitic development. No other 

 deposit of similar nature seems to have been worked at any time. 



Pyrite, however, is not at all rare in the Grenville and to a small 

 extent in some of the other formations, but none is known with high 

 enough content to be considered workable. The quality of material 

 at the Anthony's Nose property was said to be poor because of the 

 presence of pyrrhotite in addition to many intermixed silicates. 



Sand. The glacial deposits, a large amount of which is modified 

 drift, contain numerous occurrences of washed material and fairly 

 well-sorted material answering the purposes of stuctural sand. No 

 very high-grade deposit, however, has been examined, but certain 

 occurrences situated in proximity to engineering undertakings, 

 where such material was needed, have been extensively used. One 

 of these is known as the Horton sand deposit at the north end of 

 the Garrison tunnel a short distance east of Garrison. The deposit 

 occurs in a typical kame formation, is very variable in quality and 

 of comi)aratively limited usefulness although it has considerable 

 local extent and was extensively used in the building of the Catskill 

 aqueduct. 



Other similar occurrences may be found and some are used for 

 small local supplies, but there is nothing of extraordinary value 

 except perhaps a gravel deposit on Jones point which has now been 

 completely worked out. 



Gravel. At Jones point, on the Hudson, just opposite Peekskill, 

 a rather remarkable deposit of coarse gravel has been worked for 

 many years but is now practically exhausted. It is washed glacial 

 material of the heavier sort from which practically all the clay and 

 finer material have been removed. The pebbles were largely hard 

 crystalline types and on this account produced a very high-grade 

 gravel for road metal use. This at one time was in great demand. 

 Search has been made for similar deposits elsewhere to supplement 

 the declining production from this place. Although gravel deposits 

 are not rare, a high-grade pebble content is surprisingly rare and 

 thus far none has been found to meet the requirements so well as 

 that at Jones point. Most deposits have too much sandstone, shale 

 and limestone and too little crystalline rock content. 



Road metal. Crushed stone for structural purposes, including 



