File:The Quarterly journal of the Geological Society of London (12512431184).jpg

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1853..
TRIMMER ON A GRAVEL ON CLEVEDON DOWN.
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stone ; but with them are associated
other fragments, which appear refer-
able to formations foreign to the ridge
on which the gravel rests.
A few specimens, collected hastily
the evening before I left Clevedon, ac-
company this paper. They are sub-
mitted to the examination of those
geologists who are better acquainted
with the rocks of this neighbourhood
than I am.
Neither pebbles of granite nor ma-
rine shells having yet been found in
this gravel, it cannot be absolutely
identified with the erratic tertiaries.
There is no sera, however, to which it
can be referred with so much proba-
bility as the Pleistocene ; because there
is no other during which we have
evidence of the transportation of de-
tritus over great inequalities of sur-
face, and the Walton and Clevedon
ridges acquired their present insulated
character at an epoch so remote as
the Permian, as is evident from the
Magnesian Conglomerate which sur-
rounds them.
Postscrijit. — It has been suggested
by those whose opinions are entitled
to great weight, that the Clevedon
pebble-bed is a conglomerate of the
Permian ajra.
I am compelled to dissent from
these views for two reasons — its posi-
tion with respect to the undoubted
Permian strata, and difference of li-
thological character. "With respect to
position, I have already discussed that
point, and shall only add the accom-
panying diagram by way of illustra-
tion, constructed from the Govern-
ment Geological Map (see fig.)-
With respect to lithological cha-
racter, the Permian rocks of the
neighbourhood of Clevedon should
rather be called magnesian limestone
than conglomerate. They consist of
a limestone, fine-grained enough to be

sculptured into architectural orna-
Date
Source https://www.flickr.com/photos/biodivlibrary/12512431184
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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34983412
Item ID
InfoField
108767 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 285
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/34983412
Page type
InfoField
Text
Flickr sets
InfoField
  • The Quarterly journal of the Geological Society of London. v. 9 (1853)
Flickr tags
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Flickr posted date
InfoField
14 February 2014
Credit
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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