Evidence for a Solar Cause of the Pleistocene Mass Extinction Gallery By admin-lx | April 5, 2013 - 9:00 am |August 2, 2016 Archaeoastronomy, Climatology, Downloads, Glaciology, Paleontology This gallery contains 1 photo. The hypothesis is presented that an abrupt rise in atmospheric radiocarbon concentration evident in the Cariaco Basin varve record at 12,837±10 cal yrs BP contemporaneous with the Rancholabrean termination, may have been produced by a super-sized solar proton. More →