115 
qf Granite, Quai'tz-rock, and Red Sandstone. 
nite. It is a common rock, in beds, in some gneiss and wica- 
slaie districts ; and frequently, it is distributed very abundantly 
through hills and mountains of clay-slate, in the form oi‘ beds, 
imbedded masses, and veins. It sometimes appears in greyzoacl^e 
districts, and great beds of it are observed alternating with red 
sandstone. 
III. — Geognostical Relations of Red Sandstone. 
In general all the different kinds of sandstone have been con- 
sidered as entirely unconnected with any of the primitive or 
transition rocks, and strictly conhned to the secondary class. This 
restriction, however, is not consistent with our present know- 
ledge' of the geognostical distribution of this rock, and it is now 
known that some sandstones are connected with rocks, consider- 
ed by authors as members of the transition and primitive classes. 
Red Sandstone in Beds. 
This rock occurs in beds of very various magnitudes. These 
at their line of junction with the bounding rocks, shew intermix- 
tures, transitions, and veins or shoots from the upper and lower 
side, and from their extremities. 
Red Sandstone in Imbedded Masses. 
Hed sandstone also occasionally occurs in large imbedded 
masses, like those of granite in syenite, or of quartz-rock in 
gneiss, in strata of different kinds. Small veins shoot from the 
sandstone into the bounding rock, and frequently intermixtures 
and transitions are to be observed, with the neighbouring strata. 
Rocks in idiich Red Sandstone occurs. 
Red sandstone occurs, in imbedded masses and beds, in gra- 
nite, porphyry, granular foliated limestone, clay-slate, and gneiss, 
5. 
It thus appears that granite, quartz-rock, and red sandstone, 
exhibit the same relations on the great scale, as they do in the 
smaller masses mentioned in the 3d section ; and hence it follows, 
that these rocks are chemical deposites, and of simultaneous 
formation with the various strata in which they are contained. 
