NS3778 : Cornstone outcrop

taken 5 years ago, near to Renton, West Dunbartonshire, Great Britain

This is 1 of 3 images, with title Cornstone outcrop in this square
Cornstone outcrop
Cornstone outcrop
The outcrop is about 40 metres off the path shown in the foreground of a picture of NS3778 : Carman Reservoir. It is of limestone, but coarse and gritty, with small angular pieces of quartz and other material; it is evidently cornstone, which occurs in other outcrops nearby (NS3778 : Cornstone outcrop), and which was, only a little further away, worked in some quantity: NS3678 : Former cornstone workings on Carman Muir; see the references given there.

On the satellite map (see the end-note), this outcrop is indicated by an orange marker pin (labelled "Outcrop 1"): see LinkExternal link for the map, centred on that pin.

In its overall form, the outcrop in the present picture is much like the following example from another moor a few miles from here: NS4480 : Cornstone outcrop.
Carman Muir: outcrops and old quarry pits
See LinkExternal 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
● Hut circle: LinkExternal link
● Carman (house): LinkExternal link
● Carman (enclosure): LinkExternal link
● Carman (field system): LinkExternal link
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Grid Square
NS3778, 197 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Wednesday, 26 March, 2014   (more nearby)
Submitted
Thursday, 17 April, 2014
Geographical Context
Geological interest  Rocks, Scree, Cliffs 
Primary Subject of Photo
Rock 
Subject Location
OSGB36: geotagged! NS 3778 7850 [10m precision]
WGS84: 55:58.3203N 4:36.0586W
Camera Location
OSGB36: geotagged! NS 3778 7850
View Direction
Northeast (about 45 degrees)
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Other Tags
Cornstone 

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Image classification(about): Geograph
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