NS3778 : Old quarry pit

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

This is 1 of 10 images, with title Old quarry pit in this square
Old quarry pit
Old quarry pit
The large irregular hollow, filled with the dry remnants of the previous year's bracken growth, was once the site of quarrying.

The satellite map linked from the end-note shows this pit in relation to the course of the underlying limestone deposits; this pit is indicated on that map by a light blue marker pin, labelled "Quarry Pit 18". See LinkExternal link for a zoomed-in view that is centred on that marker.

As that map makes clear, when travelling westwards along this particular line of deposits (there are other similar lines of limestone deposits nearby), this large pit is the last conspicuous surface feature to be encountered (there are a few more inconspicuous ones: much smaller, round, shallow pits only a little further on, which were probably test pits).
Carman Muir: outcrops and old quarry pits

See Link (in a Geograph article) for further information, and LinkExternal link for an annotated satellite view on which various features of geological interest (as well as traces of associated industries and other antiquities) are marked, as described below.

The topography of the parts of Carman Muir to the south of Cardross Road is determined to a large extent by cornstone deposits, which outcrop in places. Cornstone is an impure granular limestone, a fossil soil. Old quarry pits (probably worked before the nineteenth century) and possible test pits can be seen along the lines of these deposits; they are indicated by light blue marker pins on the annotated satellite view, and the cornstone outcrops are marked by orange pins.

This area, lying to the south of Cardross Road, exemplifies what the British Geological Survey refers to as the Kinnesswood Formation (see LinkExternal link at the BGS website for more information); this formation contains cornstone deposits.

Beside and to the north of Cardross Road are outcrops of sandstone rather than cornstone. The sandstone is best seen along a line of outcrops and pits beside the road (these are indicated by reddish marker pins on the annotated satellite view). Another prominent example lies at the ENE end of that line: a large disused red sandstone quarry, the old Fairy Knowe Quarry (later known as Carman Quarry) LinkExternal link at NS36967900. This area beside and to the north of the road exemplifies the Stockiemuir Sandstone Formation (see LinkExternal link at the BGS website for further details).

Both north and south of the road, the strata in this area generally dip at an angle of from 10 to 20 from the horizontal, descending towards the SSE; the Stockiemuir Sandstone Formation that is exposed beside and to the north of the road underlies the cornstone-containing Kinnesswood Formation to the south of the road.

The annotated satellite view also includes markers for various antiquities in the area:

● Ancient cairns: LinkExternal link
● Circular enclosure: LinkExternal link (originally reported as a hut circle)
● Carman (house): LinkExternal link
● Carman (enclosure): LinkExternal link
● Carman (field system): LinkExternal link

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Grid Square
NS3778, 210 images   (more nearby search)
Photographer
  (find more nearby)
Date Taken
Friday, 27 February, 2015   (more nearby)
Submitted
Thursday, 2 April, 2015
Geographical Context
Quarrying, Mining  Derelict, Disused  Moorland 
Primary Subject of Photo
Pit 
Subject Location
OSGB36: geotagged! NS 3736 7841 [10m precision]
WGS84: 55:58.2633N 4:36.4587W
Camera Location
OSGB36: geotagged! NS 3737 7841
View Direction
WEST (about 270 degrees)
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Image classification(about): Geograph
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