About 66 million years ago, a 10-kilometer-wide asteroid slammed into Earth and not long afterward, all nonbird dinosaurs, as well as many other species on land and in the sea, perished.
, which took place 3,000 kilometers away off the coast of what’s now Mexico’s Yucatán Peninsula . Previous work has also suggested that some of the fossilized Tanis fish have tiny spherules — solidified globs of molten and vaporized rock that had been flung skyward from the asteroid impact — stuck in their gills, a strong sign that the fish were still living and breathing as hell rained down on them.
Some fish bones have features that can record seasonal and annual cycles of growth — akin to the growth rings in trees. These features typically include a thick band signifying vigorous bone growth, a thinner band that characterizes slow growth and a feature called a line of arrested growth that can denote wintertime or, sometimes, periods of famine or drought.
Fossilized fish bones unearthed in southwestern North Dakota suggest that the asteroid impact that ended the Cretaceous Period occurred during a time of growth and renewal in the Northern Hemisphere, vertebrate paleontologist Melanie During and colleagues say.The regularity of the lines of arrested growth chronicled in the fish bones strongly suggest that the fish weren’t suffering from drought or famine when they died, During says. “By all indications, these fish were doing fine.
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