| Computer Code: |
PET1 |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Pleistocene Epoch (QP)
— Pleistocene Epoch (QP) |
| Lithological Description: |
The deposits of the first terrace are largely gravels of Carboniferous sandstone with scattered flints, with thin seams of clayey sand and sandy clay, 1.5 to 7 m thick. The clasts are up to 20 mm in diameter, increasing to 130 mm at the base. |
| Definition of Lower Boundary: |
Unconformable on bedrock of Palaeogene and Late Carboniferous age. |
| Definition of Upper Boundary: |
At the land surface. |
| Thickness: |
To about 7 m. |
| Geographical Limits: |
The Petrockstow Basin, Devon. |
| Parent Unit: |
Petrockstow Valley Formation (PETRO)
|
| Previous Name(s): |
River Terrace Deposits, 1 (Petrockstow) [Obsolete Name and Code: Use PET1]
(-449)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
The valley of the Petrockstow Basin. Freshney et al., 1979. |
| Reference(s): |
| Freshney, E C, Beer, K E, and Wright, J E. 1979. Geology of the country around Chumleigh. Memoir of the Geological Survey of Great Britain, Sheet 309 (England and Wales). |
| McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E308
E309
|
