A newly published study sheds light on the slab of dinosaur tracks an expert discovered near the NASA Goddard Space Flight Center back in 2012.

According to researchers, the sandstone slab contains a minimum of 70 tracks from dinosaurs and mammals, and they date back more than one million years.

The entire slab was discovered after Ray Stanford, a dinosaur track expert in Maryland, spotted a nodosaur track on land in the Goddard Space Flight Center’s campus.

The nodosaur track discovery prompted the excavation of the fossil, which was part of a big stone slab.

That slab was then analyzed by University of Colorado at Denver paleontologist Martin Lockley, Stanford and other experts.

During that analyses, more than 70 tracks were found preserved in the sandstone.

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