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Name:
Cyclomedusa davidi
Age: Precambrian
Formation: Vendian
Location: White Sea region of Russia
Size: Larger specimen is 0.8 inches across
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These are extremely rare and enigmatic fossils. This is a beautiful pair of Cyclomedusa davidi from the White Sea region of Russia. UC Berkley says of this ancient creature:
''Cyclomedusa is probably the most widespread Vendian fossil. It also has one of the largest size ranges, ranging from a few millimeters to about a meter in diameter. Formerly thought to represent a planktonic (floating) jellyfish of some sort, Cyclomedusa is now considered by some to have been a benthic (bottom-dwelling) polyp, somewhat like a sea anemone. It reproduced by division in two or by budding.''
Both of these specimens display the classic Cyclomedusa features beautifully - somewhat round with ruffled edges and concentric circles radiating from the center. The detail of these fossils is quite striking and simply amazing, for a polyp! The distinct fossils are well showcased on a block of very fine-grained sandstone. This is a museum quality multiple example of this strange, enigmatic Precambrian organism.
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