Ancient footprints, Fraserburg
Did you know?
The Bradysaurus was a lumpy vegetarian pre-dinosaur therapsid with a predilection for passing gas.
On a certain day in 1968, a Karoo farmer by the name of Nic van Gass was stalking across the veld on his property, Gansfontein, near Fraserburg, in a foul mood.
His dam had burst, and water loss in the Karoo is never a laughing matter. But as he walked, he noticed strange footprints in the freshly washed rock at his feet.
Geologists were alerted, and they revealed a water course that went back more than 250-million years to the end of the Permian Period, when two-thirds of present-day South Africa was under sea. This was the time that therapsids - early mammal-like creatures that preceded the dinosaurs - roamed the Earth.
The rock bed laid bare by the waters of the bursting dam used to be clay. As such, it became a fine canvas for evidence of ancient life and is now known as the Gansfontein Palaeo Surface.
You can see the tiny marks left by worms as they foraged and moved about. Even the ripples made by wind over flowing water are evident, as are the small parallel lines of dots left by a brace of ancient beetles.
Wander on and you will spot the pigeon-toed leguaan-like footprints of an Anthiosaurus as it once waddled across the shallow waters. And here, see the passing of very old fish in the form of their fin marks.
Star of this display is what the kids around here call ‘the Croco Monster’ – the single right footprint of a very large Bradysaurus. It stands out so clear it could have been made yesterday.
Why is this so perfectly preserved? The theory is that a pile of soil and debris – at least a kilometre high – must have landed on this spot to turn it from clay to rock over time. What was the cataclysmic ‘event’? Some say it was a comet strike, others prefer the ‘supervolcano’ theory. Either way, the skies darkened and more than 96 percent of all life on Earth simply vanished.
But as you standing tracking ancient life on the rocks of this farm outside Fraserburg, 250-million years are rolled back in a flash...
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Who to contact
Contact: Vincent Opperman
Tel: +27 (0) 23 741 1012