Post by mouse on Feb 3, 2018 8:41:45 GMT -5
www.theguardian.com/world/2015/jan/03/great-blue-hole-belize-clues-fall-mayan-civilisation
mm climate change... it must have been all the cars they drove .. the coal they burned...and the central heating that caused the climate change
""""A massive underwater sinkhole surrounded by reefs, caves and sharks has provided archaeologists with clues in the mystery of the fall of the Mayan civilization, according to new research.
Scientists from Rice University and Louisiana State University found evidence in Belize’s Great Blue Hole, a 400ft-deep cave in a barrier reef, that supports the theory that drought and climate conditions pushed the Mayans from a regional power to a smattering of rival survivors and finally a virtually lost civilization.
The researchers took sediment samples from both the ancient sinkhole and the central Belize lagoon corresponding to the era of the Mayan decline, between 800 and1000 AD. In those samples they tested the ratio of aluminum and titanium – a sign of heavy rainfall from tropical cyclones pounding the element out of the rock and into the sea. Their study on the lagoon, which has yet to be published, complements one published last year in Scientific Reports on the Hole, and found relatively little titanium, meaning there had been fewer tropical cyclones and longer droughts than normal during those two centuries."""