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GeoRef Subject
clastic rocks Arthropoda Articulata biogenic structures Brachiopoda claystone sedimentary structures Reedsville Formation paleoecology sedimentary rocks sediments mudstone Pennsylvania Invertebrata Lebanon County Pennsylvania Ordovician Paleozoic Upper Ordovician siltstone Sowerbyella United States stratigraphy Trilobita Strophomenida tempestite Trilobitomorpha
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