NS3778 : Possible test pit

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

This is 1 of 5 images, with title Possible test pit in this square
Possible test pit
Possible test pit
In the foreground, with a stick planted in its centre, is a small round area that is greener than its surroundings; it is now a shallow depression, though it may once have been considerably deeper.

It was perhaps a test pit; similar small, shallow, circular pits can be seen in several places on this muir; they are often in groups, and they are all set along the line of underlying limestone deposits. Left of centre, in the middle distance, an area that is light-brown with the dry remains of last year's bracken is the lip of a large NS3778 : Old quarry pit, located on the same line of deposits. However, heading westwards along this line (that is, towards the photographer's position), that large pit is the last conspicuous surface feature. The deposits, or at least the indications of them on the surface, seem to peter out at around that point. Beyond that point there are only some shallow pits: one of them is shown in this picture; another one, much less evident photographically, is just to the south-west of it (behind the photographer's position), and is not depicted separately.

In the satellite map linked from the end-note, the small pit shown in the present picture is indicated by a light blue marker pin, labelled "Quarry Pit 19". See LinkExternal link for a zoomed-in view that is centred on that marker. The less obvious one just to its south-west, which I have not depicted separately, is marked as "Quarry Pit 20" on the same map.

Part of Carman Reservoir can be seen in the left background.
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) 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: Link
● Circular enclosure: Link (originally reported as a hut circle)
● Carman (house): Link
● Carman (enclosure): Link
● Carman (field system): Link

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Grid Square
NS3778, 210 images   (more nearby search)
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Date Taken
Wednesday, 18 March, 2015   (more nearby)
Thursday, 2 April, 2015
Geographical Context
Quarrying, Mining  Derelict, Disused  Moorland 
Primary Subject of Photo
Subject Location
OSGB36: geotagged! NS 3733 7840 [10m precision]
WGS84: 55:58.2573N 4:36.4871W
Camera Location
OSGB36: geotagged! NS 3733 7840
View Direction
East-northeast (about 67 degrees)
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Image classification(about): Geograph
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