The BGS Lexicon of Named Rock Units — Result Details

Crawfordjohn Dyke

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 (-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