See if you can find the ammonite fossils in this hornfels ("basalt" according to the Neptunists).
Just keeping track of changes to my land over the years.
Inside a narrow rift along the western margin of the Þingvellir Vallley. North American Plate to the left; Eurasian Plate to the right.
A different perspective, from lower down on the volcano.
Columnar basalt at a seaside location in County Antrim.
Some basalt showing a well-developed weathering rind and columnar jointing.
Found cropping out along the beach at Barns Ness, east of Dunbar, Scotland.
Ultramafic rocks have experienced faulting at this southernmost spot where geologists are in the Idahoan part of the Pacific Time Zone.
Collected on the northeast side of Ronas Hill adjacent to a Devonian dike.
Obverse of this sample:
Collected from a dike on the east side of Ronas Hill.
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