1855..
HARKNESS ANTHRACITE-SCHISTS.
469
These purple and grey grits and
shales have a prevailing dip towards
the N.N.W. at an angle of about 4j0°,
much less than the ordinary dip of the
Silurians, which is in the same direc-
tion, usually at an angle of about 70° ;
and these strata, having the smaller
dip, attain a perpendicular thickness of
about 1500 feet, throughout which no
fossils are seen.
Above this series of grits and shales,
we find in the course of the brook
beds of anthracitic shale (2), which are
crumpled up by flexures. As the brook
immediately above and below the an-
thracite-shales flows over pebbles, the
deposits upon which these shales rest
are not here seen. The lower beds of
the anthracite-shale occur in the form
of indurated black shales, having an-
thracitic laminee running through them.
In the more anthracitic shales we
have abundance of fossils, which con-
sist of Graptolites Sagittarius, Diplo-
grapsus pristis, D. ramosus, D. mucro-
natus, and D. bicornis; but these, as
we shall afterwards see, are not the
lowest fossils which present themselves.
After leaving the flexured anthra-
cite-shale, the strata are hidden for a
distance of about 80 yards across the
strike, when they again appear to a
small extent, dipping at a high angle
towards the S., and are immediately
succeeded by others (1*) with the same
dip as occurs in the deposits below the
anthracite-shale, viz. about 40° N.N.W.
They resemble those which are seen
lower down the stream, and seem to be
a repetition of the same strata, re-
sulting from a small anticlinal. Grits
and shales, about 240 feet in perpen-
dicular thickness, here present them-
selves ; and are succeeded by a thin
black shale, immediately underlying
the anthracite-shales here repeated (2) ;
and in this black shale we have fossils
which occupy the lowest position in
this locality.
This black shale is about 6 inches
in thickness ; its lower portion is filled
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