Carbonate cemented conglomerate
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Fact sheet
Description: 

Clasts in this Carboniferous age conglomerate range from semi-rounded poorly sorted immature siltstones, to elongate mudstone fragments and rare volcanic clasts. The framework is supported by the larger clasts and voids contain smaller clasts notably the rounded elongate mudstone fragments.

In thin section the rock is composed of rock fragments all of which appear to contain angular quartz and feldspar fragments cemented by clay and some calcite. Poorly defined sedimentary banding is present in some clasts. Angular altered volcanic rock fragments are also present, and one clast contains larger altered biotite grains indicating alkalic or acidic volcanism. The conglomerate is cemented by coarse-grained sparry calcite cement that also fills in cracks within the clasts. 

In Place
In Time
infoImage: 
Location description: 
Dunbar, East Lothian,
Accuracy:
Location precision: 
Good
Timescale:
Timescale: 
Carboniferous
Ma = Millions of years ago
In Focus
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Type:
Type: 
sedimentary
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