Bora just notified everyone to a bit of a paleontological challenge; the blog A natural history of Runswick Bay has an enigmatic fossil that seems to be reminiscent of a belemnite with a surrounding body impression, but the experts contacted about the fossil were unable to figure out what it might be. (I'm not suggesting that it is in any way related, but the fossil does remind me of Dickinsonia, an enigmatic fossil that's been interpreted in a number of ways by various researchers.) If you think you know what it is, though, head on over to A natural history of Runswick Bay and throw in your 2 cents; it'd be a better guess than mine.
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Thanks for the plug Brian, the sedimentologists think it's physical rather than biological. It's not the pliosaur I've been hoping for, but nice to have something that doesn't immediately leap out of the pages of the field guide.