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Author: ExGeo

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This is some additional information and pictures to support the geology walk at Porthcawl. Take a look at the descriptions under each picture to see more information

The Localities mentioned on this post relate to the map which is included in the leaflet PDF and is repeated here to make this page easier to read. For more information and descriptions of all the localities and the start point, parking etc. please see the leaflet

To download and print this walk, please open / download the PDF version here

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Pseudoanticline structures in caliche deposits at Locality 3 on the walk with thicker limestone layer beneath
These thicker limestone layers at locality 3 are pure enough for karstic weathering to take place on gently dipping surfaces which are not weathered by too much direct tidal action
The thicker green sandstone layers at Locality 6 which are river channel deposits. A closer view is in the picture below
A vertical section through a beaconites burrow this was created by an animal which looked something like this reconstruction which is show under CC licence created by Wikipedia user Qohelet12
The channel fills at Locality 7 can be seen to be cutting into previously deposited layers showing that at times of high flow there were erosional rather than depositional processes taking place
The structure of these ripple marks can be considered from different angles (see also picture below) and through careful review and interpretation of these the directions and nature of the flow can be determined. In this case it is considered that these are meandering rivers in a relatively low flow environment

•BGS Geology Viewer is a free smartphone app to view geological maps of Britain wherever you go https://www.bgs.ac.uk/technologies/apps/igeology-app/



We hope you enjoyed this short tour of Llansteffan. If you’d like to learn more about our local geology, take a look at other pages on the South Wales Geologists’ Association website: www.swga.org.uk

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This is some additional information and pictures to support the geology walk at Barry Island. Take a look at the descriptions under each picture to see more information

The Localities mentioned on this post relate to the map which is included in the leaflet PDF and is repeated here to make this page easier to read. For more information and descriptions of all the localities and the start point, parking etc. please see the leaflet

Barry Island Walk Map
Barry Island Walk Map

To download and print this walk, please open / download the PDF version here

Open/Download

Location 1 - Yorke Rock bed
View from Location 1 across to the steeply dipping Carboniferous age limestone of Cold Knap Point
Looking in more detail to the right of the headland you can see the almost horizontal Jurassic aged rocks in the background
At Locality 3 you can see Carboniferous aged limestone with Triassic aged breccia overlying it. This is a time gap of about 100 million years of rocks that are missing between these two rocks
You can also see the crinoid fossils in the Carboniferous aged rocks
At locality 4 you can clearly see that the Triassic aged breccia contains lumps of the Carboniferous aged limestone

•BGS Geology Viewer is a free smartphone app to view geological maps of Britain wherever you go https://www.bgs.ac.uk/technologies/apps/igeology-app/



We hope you enjoyed this short tour of Barry Island. If you’d like to learn more about our local geology, take a look at other pages on the South Wales Geologists’ Association website: www.swga.org.uk

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A recording of a ppresentation to the South Wales Geologists Association A review of some of the best fossil preservation sites in the world (Lagerstatten) by John Nudds Co-Author of the book on this subject Evolution of Fossil Ecosystems and Fossil Ecosystems of North America