62 8 JUNCTIONS OF SANDSTONE, 
white paper ; the same colour occurs in fanciful 
marks at different parts of the same light-coloured 
stone. ‘Thin seams of quartz traverse these rocks 
in some situations plentifully. Their dip is various, 
seeming to depend on the general course of the 
hills and elevations they form, but as in the slate, 
they usually look southernly, or with an inclination 
to the east or west. 
The connexions of the sandstones form of course 
the more important features of their history. When 
investigated in their course, we cannot fail to notice 
their strict conjunction with the fossiliferous strata, 
for, besides being insulated in distinct patches 
among the slates and lime rocks, alternating with 
them, and presenting hills of similar height, they 
are in themselves slightly fossiliferous in some parts, 
and so far-as I have seen, only where they approach 
or are connected to, those fossiliferous rocks,—the 
fossils themselves too, being of the same class, and 
perhaps sometimes indentically the same in each 
instance. Moreover, the sandstones may be traced 
into intimate connection and union with slates, the 
diverging blocks and masses of sandstone hills, 
and plains passing freely into the substance of the 
other rock, and this, in its turn by reason of its foli- 
ated and more subtle nature occupies the crevices, 
and fissures of the sandstones at their points of 
junction in beds. Occasionally, where sandstone 
protrudes into slate an appearance of alternation is 
observable, as occurs also, where lime protrudes 
into slate, and many blocks are composed of united 
sandstone, slate and quartz ; while finally, it not 
infrequently occurs, that some fragments at these 
spots where the strata are intermixed wear a doubt- 
ful or intermediate character, an opinion of their 
nature being as it were arbitrary. Precisely the 
same thing I have noticed as occurring to the lime 
and slate, their qualities are apt to become blended, 
