Panská Skála in Bohemia, part of what was Czechoslovakia.
Columnar basalt with an age of 25 million years.
The first stamp was issued August 8 th, 1968 to advertise
the 23rd International Geological Congress.
Additionally the stamp illustrates a fossil frog skeleton.
The second stamp was issued May 3rd, 1995.
Stamps courtesy of Matthew Healey
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