File:The Quarterly journal of the Geological Society of London (12645897753).jpg

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1863..
DAY LIAS OF DORSETSHIRE.
281
(d, the " Belemnite-stone ") by which they are capped. Above this
stone there are some 15 or 20 feet more of grey marl (c), upon
which rests the base of the Cretaceons Series.
Fig*. 1. — Vertical Section of the Middle Lias at Black Ven.
feet.
a. Greensand, chert, and Drift, about . . 230
b. Green Ammonite-nodules.
c. Grey marl 20
d. The Belemnite -stone.
e. The Belemnite-shale
/. Grey marl 1G to 20
g. Impure limestones, in uncertain and ir-
regular beds formed by the induration of
the light-coloured calcareous marls 14 to 18
h. Blue marl containing Belemnites longis-
simus, Miller 32
i. Limestone and marl with Belemnifes.
1c. Limestone and marl with Ammonites
raricostatus.
I. Lower Lias about 180
The Lias thus terminates in Black Ven at a height of about 270
feet above the sea. The road from Lyme to Charmouth, where it
passes through the east " Cuts," is about 70 feet above the highest
of the Lias. Prom this point the beds are somewhat steeply denuded
towards the valley of the Char, so that we soon lose the Middle Lias.
The Lower Lias beds dip gently in the same direction, that is, to-
wards the east ; and, at the mouth of the river, we find a fault which
throws them down some 50 feet more in the same direction.
2. Stonebarrow Hill and Westhay Cliff.— The base of the Middle
Lias is met with in Stonebarrow Hill at the height of about 80 feet
above the sea (m, fig. 2), and the Belemnite-stone (g) at about
80 feet above that again. At 16 feet over the Belemnite-stone we
find the first layer of the " Green Ammonite-beds " (e)— thus termed
by collectors from the green tint of the calc-spar that fills the cham-
bers of the Ammonites laticostatus, Sow., the characteristic fossil.
Several layers of these limestone-nodules occur in the next 16 or
20 feet. Some of the layers are more persistent than others, and all
are not equally fossiliferous.
Above these nodules the marls continue of the same character

as in the upper part of the last section (fig. 1) for 75 feet more (d,
Date
Source https://www.flickr.com/photos/biodivlibrary/12645897753
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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35328246
Item ID
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109632 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 281
Names
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NameFound:Ammonites laticostatus NameConfirmed:Ammonites latisulcatus Quenstedt 1883 NameBankID:5470803 NameFound:Ammonites raricostatus NameConfirmed:Ammonites raricostatus Zieton 1831 NameFound:Belemnites longis simus NameConfirmed:Belemnites EOLID:4780330 NameBankID:4089090
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/35328246
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 19 (1863).
Flickr tags
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Flickr posted date
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20 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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