Old Cumbria Gazetteer |
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| Castle Head Quarry, Keswick | ||
| Castle Head Quarry | ||
| site name:- | Castle Head | |
| civil parish:- | Keswick (formerly Cumberland) | |
| county:- | Cumbria | |
| locality type:- | quarry | |
| locality type:- | geological site | |
| coordinates:- | NY27112277 | |
| 1Km square:- | NY2722 | |
| 10Km square:- | NY22 | |
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 BPQ12.jpg (taken 24.8.2008)  BPQ11.jpg (taken 24.8.2008) |
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| notes:- |
The stone is dolerite, an intrusion of igneous rock. It has been slightly metamorphosed
by later pressure and consequent heating during the mountain building of the Silurian
period; ie it is a metadolerite. There are crystals of pyroxene - black, plagioclase
- white, altered to chlorite - greenish. Nearer the centre of the intrusion where
cooling was slower the crystals are larger, easier to see. The cooling has left some
columnar jointing with a hexagonal cross-section. |
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| NB: beware my amateur geological knowledge. |
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