The geology of the neighbourhoods of Flint, Mold, and Ruthin ...

CARBONIFEROUS LIMESTONE. 31
this was impossible, by estimating the thicknesses of the beds in
the north and south sides of the gorge. The section will be found
drawn to scale in Fig. 7, p. 38.
Hendre.
Feet. Inches.
Soft flaky and micaceous sandstone
- .2
Black laminated shale .
10.
--....
Fine quartzose sandstone - - .
White bastard gannister, or stony clay with
rootlets 0-6
, Quartzose sandstone
......
with pebbles as large as
walnuts - - .
- 10
a Thin-bedded dark cherty limestone with shaly
* partings
2 Massive white limestone, with many nodules and
k seams of chert in the upper part -
1 Bubbly
I Limestone
and thin-bedded limestone with shale
with Syrvngopora and Encrinites
' SandBtone with Prodnctus giganteus and Encrinites,
and a band of quartz-pebbles
....
near the centre -
Shale and thin- bedded bastard
....
"Aberdo" limestone
-
§ Hard
....
blue limestone
S Shale and limestone
i Hard blue limestone
......
j Sandstone
q Shale (seen in top of shaft) about ...
Calcareous sandstone full of quartz
Very hard massive white
.....
limestone with corals -
Thin-bedded nodular limestone with corals
Thin-bedded limestone and shale ...
Shale with fossils
"White and bluish massive limestone (upper part
of the quarry)
.....
Shale (proved in a bore-hole in the quarry) about
White limestone (the lower quarry)
At the western end of the quarry the last-named bed is traversed
by a fault of uncertain throw, and at a few yards distance by the
North Hendre Vein, so that the measurements are interrupted.
The shale and limestone with corals, previously alluded to, occur
on the western side of these breaks at about 200 yards distance
from the quarry, probably between 300 and 400 feet below the
second sandstone of the above section. The middle white and
massive limestones crop out further west, but are almost entirely
hidden in this valley by Drift-sand. Rising rapidly on the south
side they run through the Owt Coed and by the Garreg-boeth
above Coed-du to the gorge of the Alyn above Rhydymwyn, where
they are finely exposed in a number of bold cliffs on both sides
of the river. In crossing these hills, little can be seen but terrace
after terrace of massive grey or white limestone, with but a few
thin bands of shale proved here and there in the shafts. A powerful
cross-course runs from Ffynnon Lleinw by Mwyn-bwll to Hesp
25