In 1994, Bolivian workers quarrying high-grade limestone for cement reached a layer with too much quartz, a hard mineral, so they left it alone.1 As quarrying continued, more and more of the unwanted layer was exposed, forming a huge cliff and revealing hundreds of dinosaur trackways. The tracks are of at least eight different kinds of dinosaurs, including a pair of titanosaurs and a herd of 16 ankylosaurs. The layer also contains the longest dinosaur trackway in the world, over 500 m (1,640 ft), by a small theropod,1 possibly a juvenile Tyrannosaurus rex.2
Read More: The Cal Orcko (‘Lime Hill’) dinosaur trackways – creation.com
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