Name: Gogo Formation.
Location: The Kimberley, NW Australia.
Age: Upper Devonian, Frasnian. 350 million years.
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Geological Setting and Age

 Fig 1. Devonian stratigraphic column.

The Gogo Reef Formation was deposited in the Late Devonian (Frasnian; Fig. 1). In the Devonian, NW Australia was part of the southern landmass of Gondwana, which also comprised South America, Africa, Antarctica and India (Fig. 2). A barrier reef system skirted around the periphery of the palaeocontinent which deposited limestones similar to the Great Barrier Reef of the present day. The reef would have looked very different from today's reefs as the coral species were predominantly solitary, and they belonged to now-extinct groups, the tabulate and rugose corals. Ammonoids swam above the reef, as did many kinds of fishes. Especially notable were the lungfishes, which could breathe underwater and in the air. Sea scorpions (eurypterids) were also present in this primordial sea.

Fig 2.

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