In 1946, Reg Sprigg noticed "jellyfishes" in rocks from Australia's Ediacara Hills, which are now recognized as coming from the Ediacaran period, but were thought at the time to have been formed in the Cambrian.
Reg Sprigg noticed "jellyfishes" in rocks from Australia's Ediacara Hills. This was in 1946. Australia's Ediacara Hills are now recognized as coming from the Ediacaran period. Australia's Ediacara Hills were thought at the time. This was to have been formed in the Cambrian.