An international team of researchers has discovered melt-glass material in a thin layer of sedimentary rock in Pennsylvania, South Carolina, and Syria. The material – which dates back nearly 13,000 years – was formed at temperatures of 1,700 to 2,200 degrees Celsius, and is the result of a cosmic body impacting Earth. Images show melt glass known as trinitite formed at the ground surface from the melting of sediments and rocks by the very...
