Alberta aboriginal rock etchings defaced with drill, power washer, acid | Canada | News | National Post
The attack likely took place at night, to avoid being seen by nearby Hutterite farmers on whose property the rock sits, after being dropped there by a retreating glacier in the prehistoric past.
A power washer was apparently used to strip off the lichen to reveal the carvings and stained symbols. It appears acid was then sprayed to scorch off the painted images and destroy its value for date testing, Mr. Knowlton said.
A rock bore or hammer drill was used to repeatedly drill out the rock to obscure the carvings.
To do all of that would have required more than one person, a power generator, a pressure washer with a 100-litre water tank, a 1-1/2-inch electric hammer drill, appropriate bits, access to acid or a similar industrial-strength chemical, lights, ladders and a heavy truck, he said.
“It seems a deliberate effort,” said Mr. Knowlton. “This isn’t a theft or simple vandalism.”
In a different type of incident, a rare dinosaur skeleton found near Grande Prairie was destroyed by vandals who had “smashed indiscriminately” the fossilized bones of the Hadrosaur, scientists involved in the dig said.
This is inexcusable and absolutely disgusting. I hope the cowards are caught and prosecuted to the fullest extent of the law.