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I was referring to deep oceans where the bodies of the dead are undergoing decay by the time they hit the bottom. Whales often come into shallower water, which I am led to believe is more conducive for fossilization.
Let's also remember that when proto-whales were still at least partially land-dwelling creatures, they spent a lot of time in and around the edges of bodies of water.
Muddy marine environments are particularly well-suited to fossilization.
That's why we see many, many many fossils of trilobite.