Posted: Apr 18, 2019 3:39 pm
by Alan B
The BBC has recently re-shown 'The Day the Dinosaurs Died' (2017 production). One of the scientists stated that if the asteroid (likened to a grain sand hitting a bowling ball) had struck a few seconds either way, (it was travelling at 40,000 mph) there would not have been a mass extinction and possibly humans might not have evolved. The reason given was that the point of impact contained a mother lode of Gypsum - a sulphate that was expelled into the atmosphere causing a world-wide drop in temperature that virtually killed off all plant and animal life within a few days (or weeks at the most).

The idea that it took some time, (some say a 'million years' or so), for the dinosaurs of that era to die out is apparently not correct.