Fossils are continually eroding out of the ever seaward crawling cliff face, by the time they reach the intertidal virtually all of the fragile shells have fragmented and crumbled. Only the sharks teeth tend to survive. Although by the time you find them along the low tide line, unless you're very lucky, they're usually quite degraded. They've survived unscathed embedded in marine clays for 40 million years, though being rolled amongst the sand and pebbles for a few months soon wears them down...eventually to nothing. Still, even the degraded ones are cool, it's always nice to find something of that sort of age.
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