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52-million-year-old fossils support idea that bats diversified rapidly on multiple continents during the Eocene. Scientists have discovered a new bat species, Icaronycteris gunnelli, based on the oldest bat skeletons ever found in Wyoming's Green River Formation. The study supports the idea that

Green riverUnited statesFossil butte national monumentHoek ostendeArvid aaseTimb rietbergenNancy simmonsGregg gunnellTim rietbergenMick ellisonNancyb simmonsEdwardd medeirosMatthewf jonesNaturalis biodiversity centerAmerican museum of natural historyButte national monument