The BGS Lexicon of Named Rock Units — Result Details

Petherwin Formation

Computer Code: PWB Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Famennian Age (DA) — Tournaisian Stage (CT)
Lithological Description: Nodular and bedded limestone, greenish-grey slate and fine-grained sandstone.
Definition of Lower Boundary: Faulted.
Definition of Upper Boundary: Faulted.
Thickness: Not known.
Geographical Limits: Local to type area.
Parent Unit: Not Applicable (-)
Previous Name(s): Petherwin Beds (-2383)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Hillside exposures, 1.5 km. west-south-west of South Petherwin. 
Reference(s):
British Geological Survey, 1993. Tavistock. England and Wales Sheet 337. Solid and Drift 1:50 000 Provisional Series (Keyworth, Nottingham: British Geological Survey). 
Sedgwick, A and Murchison, R I. 1840. On the physical structure of Devonshire, and on the subdivisions and geological relations of its older stratified deposits. Transactions of the Geological Society of London, Vol.5, 633-705. 
Reid, C, Barrow, G, Sherlock, R L, MacAlister, D A and Dewey, H, 1911. The geology of the country around Tavistock and Launceston. Memoir of the Geological Survey of Great Britain, Sheet 337 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E337