The BGS Lexicon of Named Rock Units — Result Details
Underbarrow Flag Formation [Obsolete: use KMF]
| Computer Code: | UND | Preferred Map Code: | Und |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Ludfordian Age (SD) — Ludfordian Age (SD) | ||
| Lithological Description: | [Obsolete: use KMF] Uniform succession of sediments consisting generally of ill-sorted, silt-size quartz grains irregularly distributed in a matrix of very fine silt and clay, with subordinate discontinuous units of well-sorted siltstone. | ||
| Definition of Lower Boundary: | Taken where the characteristic finer-grained "banded-facies" (Rickards, 1964) of the underlying Bannisdale Slate Formation passes vertically or laterally into ill-sorted siltstones. | ||
| Definition of Upper Boundary: | The upper boundary is taken at the incoming of the massive siltstones of the Kirkby Moor Flags. | ||
| Thickness: | c.200m in type area: thin northwards to less than 50m in the Staveley Syncline; increase eastwards to a maximum of c. 900m. | ||
| Geographical Limits: | Not defined. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Bannisdale Slates [Obsolete Name and Code: Use BND]
(BASL)
Passage Beds [Obsolete Name and Code: Use BOOC, SGBK, CLGB, MCH, UND, YED, MYS] (-3236) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Typical sections, showing up to 15m, exposed east of Underbarrow. (Sheet 39 Kendal). | ||
| Reference(s): | |||
| Shaw, R W L. 1971. The faunal stratigraphy of the Kirkby Moor Flags of the type area near Kendal. Westmorland. Geological Journal, Vol.7, p.359-380. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E039 | |||