Pen-yr-Orsedd Slate

Material:
Slate
Category:
Metasedimentary, Metamorphic
Alternative name(s):
Welsh slate
Colour:
Pale Purple
Colour variation:
Uniform
Grain/Crystal Size:
Fine
Place of origin:
Wales
Rock Unit Name:
Geological Age:
Cambrian

Part of:

Welsh Slate

Notes:

A fine-grained smooth slate, pale purple in colour with occasional oval-shaped olive green reduction spots. Originally a deep-water, fine-grained sediment deposited c. 500 Ma during the Cambrian, these rocks were metamorphosed during the upheaval of the Caledonain Orogeny in Silurian times c. 400 Ma ago. Quarried from a major slate district near Snowdonia, Pen-yr-Orsedd was the last quarry to close in the 1970s.

References

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