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Separately and to the untrained eye, they are not particularly distinguished rocks — the backdrop to several holes at the Forest Park Golf Course, part of an excavation to improve the water system at Lake Ashburton, or left behind in abandoned quarries and mines around the area. But new research has concluded they are part of a geological upheaval hundreds of millions of years ago, when the ...

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 amo...