The BGS Lexicon of Named Rock Units — Result Details
Blue Lias Formation (Hebrides) and Breakish Formation, Interdigitated
| Computer Code: | BLBRK | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Index Level | ||
| Age range: | Hettangian Age (JH) — Sinemurian Age (JS) | ||
| Lithological Description: | Composite consisting of two or more rock units. This is necessitated because there is a N-S facies change from shallow-water Breakish Formation [BRKH] (the former Broadford Beds BFB) on Raasay and Skye (though there is also some interdigitation there) to deeper water, alternating limestone and mudstone of the Blue Lias Formation [BLIH] in Morvern and Mull. In Ardnamurchan the 2 facies interdigitate in about 50-50 proportions (Oates 1976, 1978; Hesselbo et al., 1998). See the entries for the constituent units for more information. | ||
| 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: | none recorded or not applicable | ||
| Parent Unit: | Lias Group (LI) | ||
| Previous Name(s): | none recorded or not applicable | ||
| Alternative Name(s): | Blue Lias Formation (Hebrides) Breakish Formation |
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| Stratotypes: | |||
| none recorded or not applicable | |||
| Reference(s): | |||
| none recorded or not applicable | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||