Maritza Schwarten,
That's right!! http://www.pnas.org/content/109/13/E738.abstract www.pnas.org
That's right!! http://www.pnas.org/content/109/13/E738.abstract www.pnas.org
Thanks Ruskotyara28 :)
Check out this summary of a PNAS paper on the analysis of unusual materials in sediment from a lake in Mexico:
Evidencia en Cuitzeo MX de un impacto espacial hace 12,900 años que pudo causar los eventos del fin del Pleistoceno http://www.pn…