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By oilshale
Jellyfish
Kingdom: Animalia
Eon: Phanerozoic
Era: Paleozoic
Period: Cambrian
Sub Period: None
Epoch: Furongian
Elk Mound Group
Mount Simon Sandstone or Wonewoc Formation
Acquired by: Purchase/Trade
Diameter: 1.5 cm
Krukowski Quarry
Marathon County
Wisconsin
United States
The diameter of the dark colored depression is about 1.5 cm. Around this depression there are only very faintly indicated ring-shaped structures with a diameter of about 4 cm. On the slab there is another smaller impression of a second medusa.
The Krukowski Quarry near Mosinee, Wisconsin is well known for abundant ichnofossil impressions of Climactichnites and Protichnites together with hundreds of beached jellyfish. Jellyfish impressions up to 70 cm in diameter were found on several bedding layers, so far the largest jellyfish in the fossil record. The largest recent form, the lion's mane jellyfish, can have a bell with a diameter of 210 centimetres (7 feet) and tentacles around 36.6 m (120 ft) long. This site was apparently beach and shoreline at least some of the time during the late Cambrian. Fossils and tracks are from either the Mount Simon Sandstone or from the Wonewoc Formation and are preserved in medium to coarse grained sandstone.
Identified by oilshale.
Reference:
Hagadorn, James W., Dott, Robert H. Jr., Damrow, Dan (2002) Stranded on a Late Cambrian shoreline: Medusae from central Wisconsin. Geology 30(2) pp. 147-150.
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