File:The Quarterly journal of the Geological Society of London (13860088925).jpg

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656
PEOF. C. LAPWOETH ON THE GIEVAN SUCCESSION.
of the farm-house of Craig, fine greenish-grey shales are exposed, not
unlike those of the quarries east of Blackwood Head

but the latter
lie at the northern limits of the Blackwood beds, while these Craig
shales, if the strike of the beds is to be trusted, lie on the oppo-
site or southern side of the band.
No further exposure of any moment is seen in this direction till
we cross the supposed line of the Braehill fault on the Bargany Hill,
and enter upon the Straiton band of Silurian strata, which, near
Blair Farm, emerges from below the Carboniferous rocks of that
district.
3. Blair Farm and Drwmyork. — The Silurian strata are laid open
in many sections in the course of the Lady Burn above Kilkerran
House, near Drumyork, and in the grassy mounds around the farm-
house of Blair. The disposition of the strata at this locality will be
evident on a study of the accompanying section (fig. 29).
Fig. 29. — Section of the Grey Flags and Shales of Blair and
Drumyork.
N.W.
Srcun-yarA flags
Jlcu-r £A aJca tLsttLTta
D. Dailly Series.
Db. Straiton beds.
(6) Blair shales and flags, with Cardiola, Ceratiocaris, Retiolitcs,
and Monoyraptus vomerinus.
(a) Drumyork flags, olive-green, non-fossiliferous.
What are considered to be the lowest beds are seen in the stream-
course close to the Bargany fault above Drumyork. They
consist of olive-green flags and shales, much jointed and con-
torted, crushed abruptly against the Old Red Sandstone rocks to the
south.
These beds are succeeded by flaggy shales with occasional ribs of
flagstone, weathering often of a dull yellowish tint, some striped
with lines of carbonaceous shales, others of a cold olive-green colour,
more or less calcareous, and with rough harsh flaky surface. These
are exhibited in many natural and artificial openings on the south
side of the hill-road between Drumyork and Blair Farm. In a quarry
about a hundred yards east of the farmsteading they afford in great
abundance the characteristic fossil Monograptus vomerinus, Nich.,
and less commonly the following species

—
Beyrichia Kloedeni, M'Coy.
Orthoceras subundnlatum, Portl.
Eetiolites Geinitzianus, Barr.
Cardiola fibrosa, Sow.
Bellerophon wenlockensis, Sow.
Cyrtograptus,

sp.
Date
Source https://www.flickr.com/photos/biodivlibrary/13860088925
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
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36936485
Item ID
InfoField
113692 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 656
Names
InfoField
NameFound:Bellerophon wenlockensis NameFound:Beyrichia NameConfirmed:Beyrichia EOLID:13110271 NameBankID:3435888 NameFound:Cardiola NameConfirmed:Cardiola EOLID:4774305 NameBankID:4103784 NameFound:Cardiola fibrosa NameFound:Ceratiocaris NameConfirmed:Ceratiocaris EOLID:4291597 NameBankID:4108201 NameFound:Cyrtograptus NameConfirmed:Cyrtograptus NameBankID:4134944 NameFound:Monograptus vomerinus NameConfirmed:Monograptus vomerinus NameFound:Orthoceras NameConfirmed:Orthoceras EOLID:30106 NameBankID:1861424
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/36936485
Page type
InfoField
Text
Flickr sets
InfoField
  • The Quarterly journal of the Geological Society of London. v. 38 (1882).
Flickr tags
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Flickr posted date
InfoField
15 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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