[__ Science __ ] Has the Puzzle of Deep-Sea-Fish Evolution Been Solved?

[AIG.com]

Fossilization, especially of something as fragile as a small trail in the mud, is a rare process requiring very specific conditions, particularly a quick burial.

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[Barbarian]

Fossilization, especially of something as fragile as a small trail in the mud, is a rare process requiring very specific conditions, particularly a quick burial.

The occasional underwater landslide is a good way to preserve such things. Burgess shale, for example, shows us how the Precambrian fauna developed in the early Cambrian.