Computer Code: |
CRFJ |
Preferred Map Code: |
CRFJ |
Status Code: |
Full |
Age range: |
Carboniferous Period (C)
— Cisuralian Epoch (PLC) |
Lithological Description: |
Dyke of porphyritic nepheline gabbro intruded into Ordovician wackes of the Southern Uplands Terrane. |
Definition of Lower Boundary: |
Intrusive. |
Definition of Upper Boundary: |
Intrusive. |
Thickness: |
Dyke, about 33m wide and 200+m long orientated NW - SE. |
Geographical Limits: |
Crawfordjohn area. |
Parent Unit: |
Midland Valley Carboniferous To Early Permian Alkaline Basic Dyke Suite (MCPAD)
|
Previous Name(s): |
Crawfordjohn Essexite [Obsolete Name and Code: Use CRFJ]
(-1458)
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Section |
Craighead Quarry, between Abington and Crawfordjohn, Lanarkshire. |
Reference(s): |
Scott, A, 1915. The Crawfordjohn Essexite and associated rocks. Geological Magazine, Decade 6, Vol.2, Nos 616/617, 455 - 461 and 513 - 519. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S015
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