NS3678 : Red sandstone outcrops

taken 4 years ago, near to Cardross, Argyll And Bute, Great Britain

Red sandstone outcrops
Red sandstone outcrops
This is part of a line of outcrops on the boundary between the Kinnesswood Formation and Stockiemuir Sandstone Formation (these are described in the end-note). The manner in which the ground falls away to the NNW is indicated by patterns of hatching on the 1:25000 map.

In the satellite map linked from the end-note, this site is indicated by a reddish marker pin, labelled "Red sandstone outcrop 2". See LinkExternal link for a zoomed-in view that is centred on that marker.

In the background, the Clyde is covered with a layer of mist, which, an hour or so earlier, had been much higher: it had covered NS3779 : The top of Carman Hill (taken on a different day, but in similar conditions), where I had waited for it to clear.
Carman Muir: outcrops and old quarry pits :: NS3778
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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NS3678, 130 images   (more nearby )
Photographer
  (find more nearby)
Date Taken
Monday, 6 April, 2015   (more nearby)
Submitted
Tuesday, 28 April, 2015
Geographical Context
Rocks, Scree, Cliffs 
Subject Location
OSGB36: geotagged! NS 3665 7874 [10m precision]
WGS84: 55:58.4265N 4:37.1525W
Camera Location
OSGB36: geotagged! NS 3665 7874
View Direction
Southwest (about 225 degrees)
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