A sample of the fern Neuropteris from a nodule in the Mazon Creek area.
Image capture by Graham Bird of GIGAmacro.
Lit-par-lit injection migmatite at the contact between the Cape Granite and the Malmesbury Group (meta-)sediments.
Specimen loaned by Alex Hastings, curator of paleontology, Virginia Museum of Natural History, Martinsville, VA.
Cambrian quartz arenite with prominent Skolithos tubes. Here, iron oxide staining highlights the trace fossils.
View across the central Barberton Greenstone Belt toward Barite Valley.
Tombolo connecting "Mainland" Shetland to St. Ninian's Isle, Shetland Islands, Scotland.
Looking at the blunt, trailing edge of the North American Plate from the rift valley at Thingvellir, Iceland.
with stylolites and primary sedimentary features
It looks like it's the same thing as the lower unit (below the unconformity) at Siccar Point - a graywacke.
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