NS3679 : Exposed rock face in old quarry pit

taken 7 years ago, near to Alexandria, West Dunbartonshire, Great Britain

Exposed rock face in old quarry pit
Exposed rock face in old quarry pit
The location shown here is on the line of pits mentioned in the end-note. I've called them an old quarry pits, which is one possible explanation, but the end-note gives another possibility.

If these are quarry pits, then they appear to be centuries old; as a result, bare rock is now exposed in only a few places. It is perhaps best seen at this particular spot. Click on the end-note title for related images.

This rock is very different from, for example, the red sandstone that was quarried in more recent times at NS3678 : Carman Quarry, just 700 metres to the south of this point.
Line of quarry pits near Carman Hill
To the north of Carman Hill, a previously unreported line of quarry pits extends from NS36927980 to NS37227976, following some rock outcrops (on which, see below). A single much larger pit at NS36787981 is probably an outlier of the same system. The pits are of uncertain age; if sufficiently ancient, they may have supplied the stones making up a hill-fort just to the south (see Link for views of the fort).

See Link (in a Geograph article) for further information.

(When I reported the line of pits to WoSAS, the contact there, while not ruling out the ideas set out above, suggested another possible explanation that is certainly worth taking into account: the line of pits may be the result of Second World War bombs dropped from a moving plane; the nearness of a decoy site at Kipperoch makes this idea very plausible.)

In 2015, I found, while perusing one of the British Geological Survey's 1:50000 maps (S30W: "Scotland Sheet 30W and part of 29E"), that the line on which the pits lie coincides with a geological dyke composed of quartz-dolerite of Carboniferous age ("late Westphalian to early Stephanian"). This also accounts for the topographical features evident in the vicinity of the pits.

At a period later than the one in which these pits were exploited, another quarry Link was created at the foot of Carman Hill. It was originally called the Fairy Knowe Quarry, and later Carman Quarry, and it was a source of red sandstone.
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NS3679, 44 images   (more nearby )
Photographer
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Date Taken
Thursday, 28 March, 2013   (more nearby)
Submitted
Monday, 8 April, 2013
Geographical Context
Quarrying, Mining  Derelict, Disused  Rocks, Scree, Cliffs 
Former (from Tags)
Quarry 
Subject Location
OSGB36: geotagged! NS 3694 7978 [10m precision]
WGS84: 55:58.9925N 4:36.9118W
Camera Location
OSGB36: geotagged! NS 3694 7978
View Direction
East-northeast (about 67 degrees)
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Other Tags
Archaeology 

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