| Computer Code: |
LNM |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Miocene Epoch (NM)
— Miocene Epoch (NM) |
| Lithological Description: |
Ferruginous sands, brightly coloured red, pink, yellow, orange and pale grey, fine-grained, micaceous and glauconitic. Beds of small, black, well-rounded, flint pebbles near base. Commonly occurring as infills of dissolution pipes in Chalk. Marine origin, disturbed by dissolution of the underlying Chalk. |
| Definition of Lower Boundary: |
Unconformable on rocks of the White Chalk Subgroup, commonly preserved in dissolution hollows. |
| Definition of Upper Boundary: |
Surface. |
| Thickness: |
c.3m |
| Geographical Limits: |
Restricted to the North Downs northeast of Lenham, Kent, above +180m OD. |
| Parent Unit: |
Residual Deposits Group (RESID)
|
| Previous Name(s): |
Lenham Beds [Obsolete Name and Code: Use LNM]
(-3536)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Overgrown abandoned brickpit near Friningham, Kent. Worssam et al., 1963. |
| Reference(s): |
| Prestwich, J. 1858. On the age of some sands and iron-sandstones on the North Downs, with a note on the fossils, by S.V. Wood. Quarterly Journal of the Geological Society, Vol.14, 322-335. |
| Worssam, B C. 1963. Geology of the country around Maidstone. Memoir of the Geological Survey of Great Britain, Sheet 288 (England and Wales). |
| Reid, C. 1890. The Pliocene deposits of Britain. Memoir of the Geological Survey. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E288
|
