Earthwatcher

Earthwatcher deceased

Posted: 02 Apr 2019


Taken: 27 Sep 2018

2 favorites     4 comments    136 visits

1/80 f/7.1 85.0 mm ISO 800

Canon EOS 600D

EF-S15-85mm f/3.5-5.6 IS USM


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Keywords

beach
Fox Hole Anticline
Little Haven
The Settlands
Pembrokeshire
joints
Wales
geology
folds
sandstone
coast
cliffs
rocks
Lower Coal Measures


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Fox Hole Anticline - northern limb jointing with candle

Fox Hole Anticline - northern limb jointing with candle
Structural geology of Little Haven and The Settlands

The cliffs from Little Haven to Broad Haven (and northward) display a spectacular range of geological structures, folding, faulting and thrusting, mainly in the Lower Coal Measures. The relatively weak mudstone and shale-dominated sequences show much incompetent deformation: tight, thrusted and overturned folds, in contrast to the thicker, stronger, sandstones which have formed relatively open and concentric folds.

The northern limb of the Fox Hole anticline forms the southern headland of The Settlands bay. The style of folding is open and concentric, largely due to the thick (approx 70 m in total) and competent (strong) nature of the sandstone of which it is comprised. At the western end of the headland the bedding dips at about 30° to the north, but this steepens along its length to become near-vertical at the eastern end of the headland.

This is a view looking head-on at the steeply dipping bedding surfaces. The bedding is cut by nurmerous joints (fractures) which in this case has been enlarged by erosion to form a shallow sea cave at beach level. Someone has lit a candle on a rack inside the cave. Perhaps a memorial to a loved one?

Fred Fouarge, Amelia have particularly liked this photo


Comments
 Amelia
Amelia club
I love all this geological information, although I don't understand some of it. We live in a red sandstone area in Shropshire. the stone is, for the most part, not hard wearing, and walls made from it erode very badly. Our local church is built with what seems to be a better quality of red sandstone.
4 years ago.
Earthwatcher club has replied to Amelia club
Thanks! I'm glad you like all the information. :-)
I guess your walls and buildings will be made from the Devonian age Old Red Sandstone, which can be very good for building stone, depending where it is from. it's possible that the large buildings like your church was made with relatively unweathered stone from good quarries, whereas field boundary walling stones may have been sourced from relatively shallow (and hence partly weathered) local pits and scrapes.
4 years ago.
 Fred Fouarge
Fred Fouarge club
Dat lichtpuntje,,,is dat de uitgang ?
4 years ago.
Earthwatcher club has replied to Fred Fouarge club
Nee, het is een kaars.
4 years ago.

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