NS3778 : Signs of surface quarrying

taken 3 years ago, near to Renton, West Dunbartonshire, Great Britain

Signs of surface quarrying
Signs of surface quarrying
As can be seen in the picture, the area between the photographer's position and the pylon that is directly ahead is a little higher than the ground on other side. It corresponds to one of the lines of limestone outcrops mentioned in the end-note (this particular line is quite short, and not particularly obvious). The gorse that is right of centre in the foreground occupies a small hollow, a sign of small-scale surface quarrying (perhaps involving no more than the removal of a small outcrop at that point).

Though it cannot be seen clearly from here, there is a much larger hollow ahead, right of centre, on the near side of the dry-stone wall: NS3778 : Old quarry pit. It is on the same line of limestone outcrops.

The power lines and the dry-stone wall that can be seen in this picture are marked on the 1:25000 map.

In the satellite map linked from the end-note, the small pit in the foreground of the present picture is indicated by a light blue marker pin, labelled "Quarry Pit 26". See LinkExternal link for a zoomed-in view that is centred on that marker.
Carman Muir: outcrops and old quarry pits
See 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
● Hut circle: LinkExternal link
● Carman (house): LinkExternal link
● Carman (enclosure): LinkExternal link
● Carman (field system): LinkExternal link
Creative Commons Licence [Some Rights Reserved]   © Copyright Lairich Rig and licensed for reuse under this Creative Commons Licence.
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NS3778, 188 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Thursday, 16 April, 2015   (more nearby)
Submitted
Saturday, 2 May, 2015
Geographical Context
Quarrying, Mining  Derelict, Disused  Moorland 
Subject Location
OSGB36: geotagged! NS 3749 7824 [10m precision]
WGS84: 55:58.1744N 4:36.3277W
Camera Location
OSGB36: geotagged! NS 3748 7824
View Direction
EAST (about 90 degrees)
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