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SH7879 :: Cliff outcrop 1

Taken 2 years ago by Jonathan Wilkins near Llandudno, Conwy, Wales

Cliff outcrop 1 by Jonathan Wilkins
Cliff outcrop 1

Prominent cliffs below the western face of Deganwy Castle comprise bedded, rhyolitic tuffs of Ordovician (Caradoc) age. A crude bedding can be discerned tilting at about 45 degrees to the right in this image. At right-angles to the bedding, and hence sloping to the left, are major joint planes which intersect to form rough, prismatic columns which are best viewed from the footpath lower down and to the west. This is a columnar-jointing feature, and the bedding shows that a series of thick ash-flows accumulated in a thick, hot pile which took a long time to cool completely. Ivy growing on the cliff face is home to many jackdaws who nest in some security. See also SH7879 : Cliff outcrop 2.
Creative Commons Licence [Some Rights Reserved]   ©Copyright Jonathan Wilkins and licensed for reuse under this Creative Commons Licence.
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Subject Grid Square SH7879
Subject Lat/Long 53.297578,-3.830356 (click to view more nearby images)
Near Llandudno, Conwy, Wales
Photographer Jonathan Wilkins
Taken 20200403 202004 2020 (about 2 years ago)
Submitted 2020-04-03
Context Geological interest · Uplands · Rocks, Scree, Cliffs ·
Subject geological feature ·
Group Cliff Outcrop ·

View full page at geograph.org.uk/photo/6432058