Jellyfish – Class Hydrozoa, Family Narcomedusae
Middle Cambrian
Marjum Formation
Marjum Pass, House Range, Millard County
Utah, USA.

The Marjum Formation is celebrated for its exceptional preservation, capturing delicate organisms that would normally decay before fossilization. Fossil jellyfish provide valuable insight into the diversity of Cambrian oceans and demonstrate that complex pelagic ecosystems were already well established over 500 million years ago.
8mm jellyfish on 46mm slab