NM4434 : Fossil mud cracks in Triassic cornstone, Gribun

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

Fossil mud cracks in Triassic cornstone, Gribun
Fossil mud cracks in Triassic cornstone, Gribun
The foreshore at Gribun exposes sandstones, cornstones and conglomerates of Triassic age with some quite good outcrops between the seaweed-covered zone and the grassy meadows above a line of (very) low cliffs. As the bedding is almost level, single beds like this cornstone have been planed off by the sea. The rock was deposited in tropical lagoon conditions, which periodically dried out, forming polygonal cracked mud surfaces which were then filled in by the next inundation. The infilling was with a darker sediment which formed a slightly harder rock, and these filled cracks now resist erosion a little better than the main mass of rock and stand proud.

Beyond the foreshore lies Loch-na-Keal and the island of Inch Kenneth.
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NM4434, 7 images   (more nearby )
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Date Taken
Thursday, 29 May, 2014   (more nearby)
Tuesday, 3 June, 2014
Geographical Context
Coastal  Geological interest  Estuary, Marine  Rocks, Scree, Cliffs 
Subject Location
OSGB36: geotagged! NM 4491 3488 [10m precision]
WGS84: 56:26.2149N 6:8.3856W
Camera Location
OSGB36: geotagged! NM 44929 34879
View Direction
West-northwest (about 292 degrees)
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Other Tags
Fossil Landscape  Mudcracks  Triassic  Cornstone  Foreshore 

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Image classification(about): Geograph (Fourth Visitor for NM4434)
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