Graham Eaton / Ductile folding in Pre-Cambrian age, metamorphic, Chlorite Schist. Llyn, Wales, UK, May

Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age, metamorphic, Chlorite Schist. Llyn, Wales, UK, May

Graham Eaton / Crenulation cleavage developed in Pre-Cambrian age chlorite schist, a metamorphic rock Llyn, Wales, UK, May

Graham Eaton / A Tertiary age dolerite dyke intruded into foliated, Pre-Cambrian age quartz mica schist near Rhosneigr, Anglesey, Wales, UK, June

Graham Eaton / Tightly folded Pre-Cambrian age, Quartz Mica Schist, a metamorphic rock. These are ductile folds generated under compression. Rhoscolyn Wales, UK, June

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.

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.

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.

Graham Eaton / A thrust fault in Cambrian and pre-cambrian age sediments, Aberdarron, Lleyn, Wales, Novemeber 2012

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

Graham Eaton / Pink Pre-Cambrian Quartzite boulders on a shingle beach, Llanddwyn Island, Anglesey, Wales, August 2012

Adrian Davies / Fossil Sea Pen: Charnia masoni. Pre-Cambrian, (more than 560 million years old), found in Newfoundland. Specimen approx 18cm high. Plaster cast.

Troels Jacobsen/Arcticphoto / Glaciers have transported these folded sedimentary rocks, dated to the Cambrian and late pre-Cambrian. Segelsllskapets Fjord, northeast Greenland National Park, September 2008.

Troels Jacobsen/Arcticphoto / Glaciers have smoothed these folded sedimentary rocks, dated to the Cambrian and late pre-Cambrian. Segelsllskapets Fjord, northeast Greenland National Park, September 2008.

Troels Jacobsen/Arcticphoto / Glaciers have smoothed these folded sedimentary rocks, dated to the Cambrian and late pre-Cambrian. Segelsllskapets Fjord, northeast Greenland National Park, September 2008.

John Cancalosi / Close up of Zebra Stone, Western Australia, fine grained siliceous argillite, dark bands contain iron, Pre-Cambrian period

Paul D Stewart / Nemiana simplex, a White Sea Ediacaran fossil (upper Vendian) in the sandstone shales from the Novodnestrovsky Quarry, Podolia, Ukraine. The ediacaran biota existed from about 580 to 540 million years...

Paul D Stewart / Putative cryogenian cnidarian fossil impressions from the Ranford formation of Australia, of a form reminiscent of the modern Porpita porpita (blue button colonial hydroids). The structure has also be...

Graham Eaton / A shear zone in Pre-Cambrian graphite schists and phyllite. The rocks are highly deformed and contain faults and Riedel Shears, near Aberdaron, Wales, UK. April, 2021.

Graham Eaton / A section of Pre-Cambrian age metamorphic rocks displaying S-C deformation fabric, Holy Island, Anglesey, Wales. July, 2021.

Graham Eaton / Kink bands / crenulation cleavage in chlorite schist, a metamorphic rock of Pre-Cambrian age, Nefyn, Wales, UK. May, 2018.

Graham Eaton / Folded Pre-Cambrian age, metamorphic rocks, along the coast, Holy Island, Anglesey, Wales, UK. July, 2021.