The BGS Lexicon of Named Rock Units — Result Details
Stockdale Rhyolite Formation [Obsolete: use YRL]
| Computer Code: | SRH | Preferred Map Code: | SRh |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Cautleyan Stage (OU) — Cautleyan Stage (OU) | ||
| Lithological Description: | [Obsolete: use YRL] Pink to pale grey flow-banded or flow-folded rhyolite with lithophysae locally present. Contrasts with sedimentary formations above and below. | ||
| Definition of Lower Boundary: | At junction with calcareous siltstones of Stile End Formation. | ||
| Definition of Upper Boundary: | At junction with limestones of the Applethwaite Formation (Mcnamara, 1967), at several localities the formation is overlain by a conglomerate of rhyolite pebbles. | ||
| Thickness: | Maximum thickness c. 190 metres, thins and dies out westwards over a distance of 2 km. Continues eastwards to Shap, but exposure is discontinuous and lateral variation uncertain. | ||
| Geographical Limits: | Not defined. | ||
| Parent Unit: | none recorded or not applicable | ||
| Previous Name(s): | Stockdale Rhyolite
(-542)
Yarlside Rhyolite [Obsolete Name and Code: Use SRH, YRL] (-3693) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Series of exposures on hillside, west of Stockdale Beck, Sheet 39, Kendal. | ||
| Reference(s): | |||
| Lawrence, D J D, Webb, B C, Young, B and White, D E. 1986. The geology of the Late Ordovician and Silurian rocks (Windermere Group) in the area around Kentmere and Crook. Includes map, 1:25,000 series, Parts of Sheets NY40 and SD49 Kentmere and Crook, Solid and Drift Geology. Report of the British Geological Survey, 18/5. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E039 | |||