Old Cumbria Gazetteer |
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| stone wall, Borrowdale | ||
| civil parish:- | Borrowdale (formerly Cumberland) | |
| county:- | Cumbria | |
| locality type:- | stone wall | |
| locality type:- | geological site | |
| coordinates:- | NY26982089 | |
| 1Km square:- | NY2620 | |
| 10Km square:- | NY22 | |
| amateur geology | ||
| stratigraphy:- | mudstone; siltstone | |
| stratigraphy:- | Ordovician; Arenig | |
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 BPQ08.jpg (taken 24.8.2008)  BPQ09.jpg The curbstones are also the same stone. (taken 24.8.2008) |
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| notes:- |
In this area the rock is a brecchia, a mud flow of volcanic ashes, a tuff, with angular
fragments of broken Skiddaw group mudstones; this is perhaps a lahar? This is at the
edge, the lowest/earliest layers, of the Borrowdale Volcanic Group. The Borrowdale
volcanics started with a bang, as an eruption broke through the overlying mudstones
at the end of the Ordovician period. The volcanism caused by the subduction zone on
the margin of the Iapetus Ocean which was closing. The rocks are iron stained, red. |
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| NB: beware my amateur geological knowledge. |
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