NS3778 : Signs of surface quarrying

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

Signs of surface quarrying
Signs of surface quarrying
The round shallow depression is a relic of quarrying.

In the satellite map linked from the end-note, this site is indicated by a light blue marker pin, labelled "Quarry Pit 11". See LinkExternal link for a zoomed-in view that is centred on that marker.

The pit lies on the line of some underlying limestone deposits. In the background of the picture, a little right of centre, beside a pylon, is a dark bump, which is a NS3778 : Cornstone outcrop; it lies on a similar line of deposits, running parallel to the one on which the pit is located. The two lines of deposits are indicated by pale blue lines on the satellite map; the distance between them varies along their length, but, at their closest, they are about 50 metres apart.
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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NS3778, 210 images   (more nearby search)
Photographer
  (find more nearby)
Date Taken
Wednesday, 18 March, 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 3763 7847 [10m precision]
WGS84: 55:58.3011N 4:36.2016W
Camera Location
OSGB36: geotagged! NS 3763 7847
View Direction
Southwest (about 225 degrees)
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