File:The Quarterly journal of the Geological Society of London (12684274743).jpg

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1852..
WESTON ON PORTLAND.
117
AVe must now refer to the contemporaneous Purbeck beds in tbe
Isle of Portland.
Former sections * have shown that the Isle of Portland dips away to
the S., so that the high escarpment on the N. diminishes to a mural
cliif, very little elevated above the sea-level, at the Bill. This ex-
tremity I examined for the express purpose of determining whether
my suspicions of the extension of the Purbeck so far South, which
my hurried visit in 1847 had led me to entertain, were correct or
fallacious ; and I now found on its western side an unequivocal section
of the junction of the marine and freshwater strata, as in the accom-
panying sketch.
Fig. 10. — Section of part of the Cliff at the Bill of Portland,
Shingle-bed ..
r Purbeck
Second Dirt-bed
Purbeck
First Dirt-bed
Purbeck
.Valvata and Cyrena.)
Portland
(Trigonice, Pectines, ^c.)
7. Marine.
6, Alternations of terrestrial
and freshwater ?
5. Terrestrial.
4. Freshwater ?
3. Terrestrial.
2. Freshwater.
1. Marine.
No. 1 is the Portland formation. It is quarried down to nearly
high^water-mark, and abounds, from the lowest portions to within a
short distance from its junction with No. 2, with remains of marine
lamellibranchiate molluscs. The beds which are immediately below
the Purbeck in the northern part of the island, are, on the other hand,
equally marked by a profusion of gasteropodous molluscs.
No. 2. This stratum is not very decidedly separated from No. 1,
and its equivalent in the quarry containing such numerous casts and
impressions of gasteropods is Hthologically a bond fide portion of the
subjacent and unquestionable marine deposit. The strata 1 and 2
appear in situ to have been continuous and of common origin. Prof.
E. Forbes has, however, in his valuable paper On the succession of
strata in the Dorsetshire Purbecksf," clearly proved that there is no-

  • Trans. Geol. Soc. 2nd Series, vol. iv. pi. 2.

t Rep. Brit. Assoc. 1850, Transact. Sect. p. 79. Edinb. New Phil. Journ. vo-l.xlix.

1850, p. 311.
Date
Source https://www.flickr.com/photos/biodivlibrary/12684274743
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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35461119
Item ID
InfoField
109911 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 117
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/35461119
Page type
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Text
Flickr sets
InfoField
  • The Quarterly journal of the Geological Society of London. v. 8 (1852).
Flickr tags
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Flickr posted date
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21 February 2014
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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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