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![]() Petroleum companies accumulate hundreds of drill cores and other data as they explore for oil. Some of these samples of Earth's subsurface are well stored in repositories like those pictured here in the background and foreground. But not all the data find a home. Read more. The fossil pictured is the Ammonite Sphenodiscus lenticularis, Maastrichtian Stage, South Dakota. Photo by Ed Gerken for the Black Hills Institute of Geological Research Inc. |
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