Graham Eaton / Ductile folding in Pre-Cambrian age, metamorphic, Chlorite Schist. Llyn, Wales, UK, May
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Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age, metamorphic, Chlorite Schist. Llyn, Wales, UK, May
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Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age chlorite schist, a metamorphic rock Llyn, Wales, UK, May
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Graham Eaton / A Tertiary age dolerite dyke intruded into foliated, Pre-Cambrian age quartz mica schist near Rhosneigr, Anglesey, Wales, UK, June
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Graham Eaton / Tightly folded Pre-Cambrian age, Quartz Mica Schist, a metamorphic rock. These are ductile folds generated under compression. Rhoscolyn Wales, UK, June
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Graham Eaton / Pre-Cambrian Gwna Melenge exposed near Aberdaron. Blocks of limestone in caught up in a subduction zone, formed at an ancient plate bounday, the Iapetus suture. Wales, UK, November 2012.
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John Cancalosi / Fossil ripple marks, from Rocky Mountain Belt Supergroup, northwestern Montana, USA. Pre-Cambrian rock from 600 million years to 1 billion years ago.
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Graham Eaton / Pre-Cambrian age Pillow lava of the Gwna Group, formed as hot lava flowed into the sea. Lens cap for scale. Newborough, Anglesey, Wales.
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Graham Eaton / A thrust fault in Cambrian and pre-cambrian age sediments, Aberdarron, Lleyn, Wales, Novemeber 2012
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Graham Eaton / 'Gwna Melange' from Pre-Cambrian period. Blocks of limestone in caught up in a subduction zone, formed at an ancient plate bounday, the Iapetus Suture. Near Aberdaron, Wales, November 2012
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Graham Eaton / Pink Pre-Cambrian Quartzite boulders on a shingle beach, Llanddwyn Island, Anglesey, Wales, August 2012
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Adrian Davies / Fossil Sea Pen: Charnia masoni. Pre-Cambrian, (more than 560 million years old), found in Newfoundland. Specimen approx 18cm high. Plaster cast.
