Computer Code: |
CRDY |
Preferred Map Code: |
CRDY |
Status Code: |
Full |
Age range: |
Pridoli Epoch (SO)
— Early Devonian Epoch (DL) |
Lithological Description: |
Grey to brown, fine-grained to pebbly sandstones fining up into siltstones and mudstones with locally developed calcrete nodules, with localised thin beds of mudstone breccia and pebbly mudstone. |
Definition of Lower Boundary: |
The top of the conglomerates belonging to the Isle Port Conglomerate Member. |
Definition of Upper Boundary: |
The base of the volcanics forming of the Carrick Volcanic Formation. |
Thickness: |
About 70 m thick. |
Geographical Limits: |
Ayrshire, Scotland. |
Parent Unit: |
Swanshaw Sandstone Formation (SWAS)
|
Previous Name(s): |
(Part of the) Lower Old Red Sandstone [Obsolete Name and Code: Use CRDY]
(-1457)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Coastal section south of Ayr, between Fairy's Well and Katie Grey's Rocks (Jones, 2001; Smith, 2000). |
Reference(s): |
Jones, N S. 2001. Sedimentology of the Swanshaw Sandstone Formation in Ayrshire. British Geological Survey Internal Report IR/01/164. |
Eyles, V A, Simpson, J B and Macgregor, M C. 1949. Geology of Central Ayrshire. Memoir of the Geological Survey of Scotland, British Geological Survey, Sheet 14 (Scotland). |
Smith, R A. 1999. Geology of the Croy area. Explanation of 1:10,000 Sheet NS 21 SE/SW. British Geological Survey Technical Report WA/00/13. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S014
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