The small cove at Pwll Du (or Pwlldu) on the south coast of the Gower Peninsula in South Wales has been created by two fault lines extending approximately northwest to southeast. They converge inland, and separate towards the sea, meeting the shoreline more or less at right angles, with one at the east and one at the west of the bay, running through Carboniferous Limestone strata. The fault lines displace the normal sequence of rock layers so that to the west the rocks are Oxwich Head Limestone, in the middle between the faults it is Hunts Bay Oolite, and in the east it is High Tor Limestone.
Images of the rocks at the east end of Pwll Du Bay are shown in the gallery above. Photographs with details of the rocks at the west end of the bay are given in the gallery below.
Overlying the central area of Hunts Bay Oolite is a massive, multiple-tiered shingle bank which blocks the head of the valley and currently dams the river known as the Bishopston Pill. The shingle banks of Pwll Du will be featured in the next post.
Jessica's Nature Blog 
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I love looking at rock strata. There is a story-our story, in every layer. Great photos.
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Thank you, Zeuschariot.
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Love your photos 👏
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Thank you, Hopeful Herbalist.
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Wow, superb rocks! Some of it looks like a massive sandwich cake gone wrong. And some of those quartz markings look a bit like fossils – I wonder if they are?
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Thank you, Jo. The rock strata are clear to see but are tipped up at an angle instead of lying horizontally because the area has been folded into an anticline in one place and down folded into a syncline in another. And yes, all the curvi-linear white shapes are brachiopod fossils.
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Fantastic shapes, particularly in the first gallery.
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Thanks, Adrian.
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