Here's a fun little article - basically, after analysing the fossil contents of fossilised Ichthyosaur skeletons, the idea that a belamite crash caused their extintion appears unsupported now (though, of course, could still be contentiously argued for).
Apparently, Ichthyosaurs much prefered to eat small turtlers instead:
Ichthyosaurs ate turtle soup
Apparently, Ichthyosaurs much prefered to eat small turtlers instead:
Ichthyosaurs ate turtle soup