2015

NS3678 : Course of a geological dyke

taken 9 years ago, near to Cardross, Argyll And Bute, Scotland

Course of a geological dyke
Course of a geological dyke
The feature is as shown and described in NS3678 : Course of a geological dyke, but the present photograph is a view in the opposite direction. The line of the dyke recedes directly from the photographer's position, heading uphill. Beside the trees that are near the centre of the picture, it meets the line of Cardross Road.

In the left-hand half of the image, the ground can also be seen to fall away from the line of the (unseen) road. This does not correspond to the line of the dyke (which runs E-W, directly away from the photographer), but to a line of red sandstone outcrops beside the road. See the annotated satellite view that is linked from the end-note.

See LinkExternal link for a zoomed-in view of that satellite map, centred on the part of the geological dyke that is shown in the present picture.
Carman Muir: outcrops and old quarry pits :: NS3778

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


Creative Commons Licence [Some Rights Reserved]   © Copyright Lairich Rig and licensed for reuse under this Creative Commons Licence.
Geographical Context: Geological interest Primary Subject: Geological Feature other tags: Geological Dyke Click a tag, to view other nearby images.
This photo is linked from: Automatic Clusters: · Cardross Road [14] · Line of Outcrops [13] · Red Sandstone Outcrops [10] · Geological Dyke [4] Other Photos: · Course of a geological dyke Title Clusters: · Course of a geological dyke [2] ·
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NS3678, 137 images   (more nearby 🔍)
Photographer
Lairich Rig   (more nearby)
Date Taken
Wednesday, 20 May, 2015   (more nearby)
Submitted
Friday, 22 May, 2015
Subject Location
OSGB36: geotagged! NS 3646 7864 [10m precision]
WGS84: 55:58.3688N 4:37.3313W
Camera Location
OSGB36: geotagged! NS 3643 7864
View Direction
EAST (about 90 degrees)
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Image classification(about): Geograph
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