File:The Quarterly journal of the Geological Society of London (12645423134).jpg

1848,. MOORE ON FOSSILIFEROUS BEDS OF WIGTOWNSHIRE. 9
Corswall Lighthouse .
Flaggy greywacke . .
Conglomerates ,
Dally Bay
Shales T
and VCairnbrock.
Slate-^. J
.Knock Bay.
Port Patrick.
Morroch Bay
Slates and Shales.
Graptolites.
Graptolites.
Mytilus (?)
Pink Syenite .
Cairngarroch ,
Grennan Slates.
Granite •.
Mull of Galloway
Graptolites.
used for any but the poorer
farm-houses. I have thought
this granite worth mentioning,
as I am not aware that any has
been described as occurring be-
tween that of Cairnsmuir on the
Cree in Kirkcudbrightshire, and
that of the Mome Mountains in
County Down.
From the bay of Drumore to
the Grennan, a distance of one
mile and a half, a mass of slates
which have been used for roofing
purposes dips to the north at a
high angle ; and after passing a
great mass of syenite at Cairn-
garroch, which has altered the
neighbouring rocks and invaded
them in the form of dykes, we
arrive at the Morroch Bay, one
mile and a half south from Port
Patrick ; here a thick mass of
shales, black, red and grey, in
a vertical position, occurs inter-
stratified with syenite and red
earthy trap : the black shales are
in some places full of grapto-
lites ; they are remarkably fissile,
splitting readily as thin as a card,
and their surfaces are marked by
minute specks of iron pyi'ites.
The red shales are similar to
them in every respect, except in
colour, and in not containing
fossils, — differences probably due
to their greater proximity to the
trap. Proceeding thence to the
north beyond Port Patrick, after
passing much greywacke, so in-
terfered with by a dark serpen-
tinous trap, as scarce to present
a trace of stratification, we arrive
at the bay of Porto Bello near
Cairnbrock, where there is a con-
siderable thickness of slaty shales
and flags, containing graptolites,
and what appears to be the cast
of a Mytilus. These beds dip to
the south at a high angle. About