Cullaidh Shale Formation
Stratigraphic range: Bajocian

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Black shale of the Cullaidh Shale Formation overlain by a sill

Type| Geological formation
Unit of| Great Estuarine Group
Underlies| Elgol Sandstone Formation
Overlies| Bearreraig Sandstone Formation
Thickness| up to 6 metres (20 ft)
Lithology
Primary| Shale, Mudstone
Other| Sandstone
Location
Region| Europe
Country|  Scotland
Extent| Inner Hebrides

The Cullaidh Shale Formation is a geological formation in Scotland, and the lowermost unit of the Great Estuarine Group. It is Bajocian in age. The lithology largely consists of organic rich mudstone and shales, including oil shale developed near the base.[1]

## References

1. ↑ "BGS Lexicon of Named Rock Units - Result Details". https://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=CUD.

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