148 
j Assembly 
very white incrustation, which forms handsome specimens. It has the 
appearance and hardness of arragonite. Veins of white quartz and 
nodules of black hornstone are common in some of the layers. This 
stratum is employed extensively for burning into lime. 
Another stratum of sparry lime rock, farther to the south and east 
makes its appearance about a mile east of Salisbury mills, in Cornwall. 
It is here but a few rods in width, and not far distant from Skune- 
munk mountain. It is visible, with a few interruptions, across Bloom- 
ing-Grove and Warwick, to the State of New-Jersey. It is seldom 
more than a mile in width. It resembles closely the stratum near New- 
burgh, but at no point rises so high above the surface. In the village 
of Warwick, it affords good specimens of crystallized quartz, and crys- 
tallized brown spar. Fifty or sixty rods west of the Presbyterian church, 
in the same village, some of the layers are a light red colour, very close 
and compact in structure, and gives the argillaceous odour when moist- 
ened. The lustre is quite dull, and it breaks with a flat conchoidal 
fracture. Ther^ is evidently much clay in the composition. It has 
been supposed to be the water lime, but there are more glimmering 
particles in it than in the hydraulic lime of standard localities. It has 
also been examined in reference to its fitness for a lithographic stone, but 
does not prove good. It is called red marl in that vicinity. 
The minerals noticed in this rock, are quartz crystals, crystals of 
brown spar, crystals of oxide of titanium, and magnetic iron ore, so 
strong as to have given it the name of native magnet. 
In Hamptonburgh, limstone exists as a bed in the argillite. This bed 
is about two and a half miles long, and fifty or sixty rods in breadth. 
The contact of the two rocks is no where visible, although they are 
within a few rods, and in some places but a few feet distant. This bed 
has the same direction and inclination as the argillite. It is all fetid, 
and contains cubic crystals of sulphuret of iron, which are of a bright 
yellow colour. Most of the layers are the usual colour of sparry lime 
rock; some however are very dark coloured, so much so that it was 
supposed to contain coal; an excavation was accordingly made for this 
mineral; it need scarcely be observed that no coal was found. The 
surfaces of some layers are full of the fossil shells of the very early pe- 
riods of animal life. The stone of this bed has been long used for lime, 
but the quality is not very good. The argillite closes round both ends 
of this bed. It is called the Neelytown limestone in the neighborhood 
where it lies. Limestone exists abundantly in the town of Monroe, 
