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Rare chunks of Earth’s mantle found exposed in Maryland Maya Wei-Haas © Photograph by Joe Browning-Hanson George Guice with the Smithsonian National Museum of National History establishes the rock types represented by the different layers, and how laterally continuous the layers are. There is one fairly obvious layer about a foot above Guice s head (the dark grey color), which corresponds to the anorthosite layer. Guice is trying to see whether any more subtle layers exist in the rocks below this layer, and whether this can be traced along the outcrop or not. Standing among patches of muddy snow on the outskirts of Baltimore, Maryland, I bent down to pick up a piece of the planet that should have been hidden miles below my feet.

University of marylandUnited statesUnited kingdomSoldiers delightIsaac tyson jrGeorge guiceRichard walkerAtlantic oceanPacific oceanJoe browning hanson george guiceDaniel vieteJohns hopkinsMaya wei haasNational geographicJohns hopkins university in baltimoreSmithsonian national museum of history