| Computer Code: |
HANN |
Preferred Map Code: |
notEntered |
| Status Code: |
Full, without ratification |
| Age range: |
Permian Period (P)
— Permian Period (P) |
| Lithological Description: |
Olivine-minette (lampropyhre) igneous body; an outlier, which is bound to the north-east and south-west by faults trending along 295 degrees. Resistivity measurements suggest that vent agglomerate in quarry [SS 529 029] has steep sides and may be a vertical volcanic neck. |
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
South-west England; in the Hannaborough area, to the south-west of Hatherleigh. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Elvans
(ELVAN)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Hannaborough Farm. Edmonds and others, 1968. |
| Reference(s): |
| Edmonds, E A, Wright, J E, Beer, K E, Hawkes, J R, Fenning, P J, Freshney, E C, Lovelock, P E R, McKeown, M C, Ramsbottom, W H C, and Williams, M. 1968. Geology of the country around Okehampton. Memoir of the Geological Survey of Great Britain, Sheet 324 (England and Wales). |
| Ussher, W A E. 1892. The British Culm Measures. Proceedings of the Somerset Archeological and Natural History Society, Vol.38, 111-219. |
| Hutchins, P F, 1963. The Lower New Red Sandstone of the Crediton Valley. Geological Magazine, Vol.100, 107-128. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
