File:The Quarterly journal of the Geological Society of London (13935351591).jpg

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248
PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. .Jan. 24,
In the first cave, which is established on a line of fracture of the
limestone, enlarged by the passage of water, the general order of the
accumulation which occupies the lower portion, is as follows (as
traced for me in my note-book by M. Dupont ; a layer of " argile
smectique " of M. Dupont, next to the limestone rock, is merely the
product of the decomposition of the impure hmestone) : —
1. A thick accumulation of Hmestone talus, from the face of the
cliff.
2. Loamy sand.
3. Eounded quartz pebbles.
Beds 2 and 3 extend back into the cave, sloping upwards.
Fig. 3. — Section of the dejposits at the entrance of the Furfooz Cave.
a. Angular debris — Argile a blocs anguleux.
h. Stalagmite.
c. Sandy Clay. Bear and Eeindeer.
d. Shingle — Cailloux Ardennais.
e. Fluviatile sands. Beaver, &c.
In the second cave, which is lower in the cliff, there is outside,
an accumulation of debris, beneath which, and passing into the
cave, are
1. Sandy and marly beds, in which are a few angular blocks,
such as may have fallen from above whilst the bed was forming.
Lines of successive accumulation.
2. Bed of quartz pebbles, in layers, sloping outwards.
3. Sands, bedded, like river sand ; remains of beaver.
The upper level of the pebbles in the second cave* is wholly below
that of the pebbles of the first cave ; this circumstance entirely dis-
connects the shingle from any alluvial action of the Lesse. Even
Avere the two accumulations at the same level, and had they been
lodged in these caverns by a river flowing down the valley at a very
high level, the arrangement of the pebbles would probably have been
the reverse of what it is.
The materials of beds 1 and 2 seem to have been introduced from
above ; and the only portion of the accumulation which has the cha-
racter of a fluviatile deposit is the sandy bed No. 3. Numerous
specimens of the shingle are scattered over the upper platform of the

  • Ten metres above the level of the river.
Date
Source https://www.flickr.com/photos/biodivlibrary/13935351591
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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36164677
Item ID
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111477 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
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Page 248
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36164677
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 22 (1866).
Flickr tags
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Flickr posted date
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21 April 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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26 August 2015

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current06:40, 26 August 2015Thumbnail for version as of 06:40, 26 August 20151,207 × 2,055 (501 KB) (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13935351591 | description = 248 <br> PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. .Jan. 24, <br> In the fi...

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