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).
Fossil gymnosperm cone. From Cerro Cuadrado Petrified Forest site; Mid-Jurassic of Argentina. Sample loaned courtesy of Lisa Williams, NOVA-Biology faculty.
Archean BIF from the Barberton GeoTrail. Obverse of the sample can be seen here: gigapan.com/gigapans/190971.
What is the evidence for post-depositional deformation at this site, if any?
Archean "crinklies" viewed in cross-section. Note the prominent black chert cobble draped in microbial mat material.
A sample of the fern Neuropteris from a nodule in the Mazon Creek area.
Image capture by Graham Bird of GIGAmacro.
Columnar basalt at a seaside location in County Antrim.
Fantastic cliffs and sea stacks covered in nesting guillemots, razorbills, and gulls. Very impressive. Very stinky.
Spherulitic texture developed in a set of north-south-trending dikes cutting through Devonian rocks in mainland Shetland, an archipelago north of Scotland.
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