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Dinosaur ecology: hermetically sealed?

The story goes: a bolide hits; Earth's atmosphere holds particulate matter
and retards photosynthesis.  This goes on until all herbivorous dinosaurs
die off.  Having no food, carnivorous dinosaurs also become extinct.
But surely there were dinosaurs that ate mammals, lizards, crocs,
snakes--species whose diversity was little affected.  While I realize we
have no population data, no estimate of food needed or available, the
likely availability of _some_ food, especially for the smallest
meat-eaters, poses a challenge: why didn't some survive?