In 2012, local dinosaur track expert Ray Stanford discovered a nodosaur track from the Cretaceous era on the campus of NASA's Goddard Space Flight Center, in Greenbelt, Maryland. After the slab on which Stanford found the track was excavated, Stanford, paleontologist Martin Lockley, of University of Colorado at Denver, and others documented more than 70 dinosaur and mammal tracks imprinted in the sandstone. Their paper documenting the discovery was published January 31, 2018 in the journal Scientific Reports. The 8-foot by 3-foot slab contains at least 26 mammal tracks.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 126.96.36.199.0