Over a video call from a dig site near Oxford, England, Peter Falkingham points his phone down to show a fossilized footprint of what was probably a large sauropod.
Stepping inside the long-necked dinosaur print, which could fit both of his feet multiple times, he explains that these marks are parts of trackways: millions-of-years-old footprints left by dinosaurs walking on wet ground that fossilized. These trackways are key to estimating dinosaur running speeds. “The faster you move, the longer the stride you take,” says Falkingham, a paleobiologist at Liverpool John Moores University in England.
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