NS4178 : Cementstone nodule in Auchenreoch Glen

near to Bonhill, West Dunbartonshire, Great Britain

Cementstone nodule in Auchenreoch Glen
Cementstone nodule in Auchenreoch Glen
See NS4178 : Auchenreoch Glen for the context.

This nodule is lying in the bed of the burn; many similar examples can be seen there. They have eroded out of the steep southern side of the glen, where they occur in layers; those layers form part of a distinctive series of sedimentary deposits, known as the Ballagan Beds: for the details, see NS4178 : Ballagan Beds in Auchenreoch Glen, which also shows some of these layers.

However, the stone is of more than geological interest. In the past, it was of economic importance in local agriculture. Ure's "General View of the Agriculture in the County of Dumbarton" (1794) contains a detailed discussion of the various rocks burned for lime in the county, and he describes in some detail the manner in which this process was carried out. He lists the three main kinds of limestone used in the county:

(1) The most familiar form of limestone, which is of marine origin (most of the stone of this kind that was used locally was quarried at Cumbernauld and East Kilpatrick).

(2) "Moor limestone", named after the situation in which it is usually found. This is described as having a course gritty surface, and as being "quite destitute of marine productions". This kind is evidently cornstone, a limestone of terrestrial origin: NS4480 : Cornstone outcrop.

(3) "Cam-stone (glen-stone)", "mostly found in the bottom of glens" and "quite destitute of marine productions. It contains a considerable quantity of clay" and "lies in thin strata embedded in till. Some natural sections in the sides of glens, in the parish of Dumbarton, exhibit to one view more than a dozen of these strata from three inches to a foot in thickness". This a good description of the Ballagan Beds seen here and elsewhere (see the link in the second paragraph).

It is clear from these descriptions that the last-named type of stone is cementstone, of the kind shown in my photograph; it is an impure limestone that was precipitated out during extended periods of drought. The work just cited mentions that a great deal of it was burnt "for manure" (in other words, for treating fields), but notes one peculiarity of this stone, namely, that it must be slaked while still red-hot in the kiln; if allowed to cool slowly, it will not break up into lime. Several people with pitchers would be employed in pouring water into the kiln, which would emit "very loud explosions" during this operation. Lime-kilns were built near streams in order to provide ready access to water; see LinkExternal link for the remains of various local lime-kilns.
Creative Commons Licence [Some Rights Reserved]   © Copyright Lairich Rig and licensed for reuse under this Creative Commons Licence.
year taken
2010
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
+
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
TIP: Click the map for Large scale mapping
Change to interactive Map >
Grid Square
NS4178, 40 images   (more nearby)
Photographer
  (find more nearby)
Image classification?
Supplemental image
Date Taken
Friday, 25 June, 2010   (more nearby)
Submitted
Thursday, 1 July, 2010
Geographical Context
Geological interest 
Image Buckets ?
Closeup 
Place (from Tags)
Auchenreoch Glen 
Category
Rock   (more nearby)
Subject Location
OSGB36: geotagged! NS 4175 7839 [10m precision]
WGS84: 55:58.3405N 4:32.2421W
Photographer Location
OSGB36: geotagged! NS 4175 7839
View Direction
WEST (about 270 degrees)
Looking for a postcode? Try this pageExternal link
Clickable map
+

Forward to a
friend by email


Other Tags
Cementstone 

Click a tag, to view other nearby images.

This page has been viewed about 137 times.
View this location: KML (Google Earth) · Google MapsExternal link · OS Map Checksheet · Geograph Map · geotagged! More Links for this image
NW N NE
W Go E
SW S SE
[Mark
You are not logged in login | register