Joggins Rock Textures 8

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Coal seam with fossil-bearing limestone

Joggins Rock Textures 8 – Junction of a coal seam with a limestone layer packed tight with small fossil fragments, mostly bivalve shells, at Joggins Fossil Cliffs on the shore of the Bay of Fundy in Nova Scotia, Canada.

Rock textures at Saundersfoot

Natural rock textures and patterns

The natural textures and patterns in the cliff rock strata near Coppet Hall at Saundersfoot, South Pembrokeshire, Wales, really caught my eye on a first visit to the location. The stratigraphy is intriguing and complicated – and I have yet to work out exactly what I am looking at. I need a detailed geological map of the area and access to published papers for that. However, I think it fairly safe to say that they belong to the Upper Carboniferous Period, probably the Namurian, also known as the Lower Coal Measures, comprised of sandstone and mudstone layers, with coal seams and layers of iron nodules. I’ll check it all out when I can. High quality anthracite coal was open-cast mined not far away, and there used to be a local iron smelting industry.

My key guide to the geology of Gower and South Wales (George 2008) only describes in detail the geology of the stretch of beach immediately north of this place, and immediately south of it, leaving me a bit stumped as to an explanation for its peculiarities. I am definitely going back to this coastline to spend some quality time exploring the intricacies of its geological history, and photographing some of its marvellous natural abstract compositions.

REFERENCE

George, G. T. 2008, The Geology of South Wales: A Field Guide, gareth@geoserv.co.uk, 978-0-9559371-0-1.