Freshwater loch impounded by a bayhead bar, leaking water through into the sea.
Neoproterozoic glaciogenic sedimentary rock, potentially a record of a "Snowball Earth" glaciation.
Other side of this sample:
Slab showing bedding-parallel trace fossils in siltstone of the Devonian-aged Millboro Formation.
Collected at Sharp Top, Blue Ridge province, Virginia. Flip it over and have a look at the other side of the sample, here: gigapan.com/gigapans/183044
Causeway basalts over Ulster White Limestone (the Chalk).
Archean BIF from the Barberton GeoTrail. Obverse of the sample can be seen here: gigapan.com/gigapans/190971.
Archean "crinklies" viewed in cross-section. Note the prominent black chert cobble draped in microbial mat material.
What is the evidence for post-depositional deformation at this site, if any?
Primary dessication structures in modern tidal mudflats.
A sample of the fern Neuropteris from a nodule in the Mazon Creek area.
Image capture by Graham Bird of GIGAmacro.
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