Stratotype for the Ordovician-Silurian boundary. Figured out by Charles Lapworth, using graptolites.
Barberton Greenstone Belt, South Africa
Snowball Earth deposits from Islay.
A little spot for a rest after driving through one 7-km tunnel before committing yourself to the next 4-km tunnel...
Slaty cleavage is variably developed in strata of the rhythmite portion of the Neoproterozoic Konnarock Formation.
Found cropping out along the beach at Barns Ness, east of Dunbar, Scotland.
Columnar basalt at a seaside location in County Antrim.
Eastern side of Platteklippe Gorge, south of Cape Town.
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