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
Type Area  Hillside exposures, 1.5 km. west-south-west of South Petherwin. 
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). 
British Geological Survey, 1993. Tavistock. England and Wales Sheet 337. Solid and Drift 1:50 000 Provisional Series (Keyworth, Nottingham: British Geological Survey). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: