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Potential Global Standard Stratotype-section and Point (GSSP) for a Cambrian stage boundary defined by the first appearance of the trilobite Ptychagnostus atavus, Drum Mountains, Utah, USA

BiologyEngineeringNatural SciencesPrecambrian GeologyEvolutionary BiologyDrum MountainsCambrian StageGeologyBiostratigraphyTrilobite Ptychagnostus AtavusGeochronologyEarth ScienceRegional GeologyIntegrated StratigraphyTectonics