100-mn-yr-old dinosaur tracks found at NASA centre unveiled
Scientists have unveiled a sandstone slab which contains about 70 dinosaur and mammal footprints dating back over 100 million years. The specimen was identified to contain the largest mammal track ever found from the Cretaceous (post Jurassic) era along with crow-sized dinosaur tracks. The slab was spotted by a local palaeontologist while visiting NASA's Goddard Space Flight Center in 2012.