File:The Quarterly journal of the Geological Society of London (12895377944).jpg

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HULL AND GREEN MILLSTONE-GRIT.
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third bed was seen, it did not seem,
to be above 20 feet in thickness.
The little coal on the top of this
bed has been worked about half a
mile to the east of Froghall.
Yoredale Rocks. — In the anti-
clinal space between the Pottery
and Wetley Coal-fields no trace of
the upper group is to be found.
Close below the outcrop of the
third grit come quartzose sand-
stones, with all the usual charac-
ters of the Yoredale Quartzites.
In this country, where the grit-
stones have become so thin and
weakly, while the chief sandstones
of the Yoredale series still keep
up their thickness and character,
a curious change has been brought
about in the connexion between
scenery and geological structure.
In the northern districts, about The
Peak for instance, it is the Mill-
stone-grit that caps the loftiest
hills and forms the boldest ridges,
while the Yoredale Grits hold a
lower place

here, on the other
hand, the Millstone-grit makes
but little show, and the Yoredale
sandstones stand out well, and
form all the most marked features
in the landscape.
§ 6. Summary.
We have now traced the Mill-
stone-grit from the borders of Lan-
cashire and Yorkshire, where it
contains five* thick beds of mass-
ive gritstone, and reaches a thick-
ness of 2800 feet, to the borders of
the Xorth Staffordshire Coal-fields,
where only two of these beds are
left, and where the whole thick-
ness is not more than 200 or 300
feet.
"We find the Rough Eock (the
uppermost bed, with one exception)

The Kinder Scout Grit has at least
two thick gritstones, with shale between.