Nailed it HB. Australia is truly an amazing place.
In 1946 Sprigg, then a young government geologist, was poking around in the blisteringly inhospitable Ediacaran hills of the Flinders Ranges, some three hundred miles north of Adelaide, when he made one of those miraculous discoveries in which Australian natural history almost impossibly abounds. You will recall from an earlier chapter the case of the strange and long-lostproto-ant Nothomyrmecia macrops found unexpectedly at a dusty hamlet in the middle of nowhere. Well, Spriggs find was in much the same general area and, in its way, no less remarkable. His special moment came when he clambered a few yards up a rocky slope to find a piece of shade and a comfortable rock to lean against to have his lunch. As he sat eating his sandwiches he idly stretched out a toe and turned over a hunk of sandstone. Sprigg left no informal account of the event, but I think we can safely imagine him pausing in his chewingpausing for a long moment, mouth slightly opento stare at what he had just turned over, then slowly creeping nearer to have a closer look. What he had just found, you see, was something that wasnt thought to exist. For almost a century, since the time of Charles Darwin, scientists had been puzzled by an evolutionary anomalythat 600 million years ago complex life-forms of an improbable variety had suddenly burst forth on earth (the famous Cambrian explosion), but without any evidence of earlier, simpler forms that might have paved the way for such an event. Sprigg had just found that missing link, a piece of rock swimming in delicate pre-Cambrian fossils. He was looking, in effect, at the dawn of visible lifeat something no one had ever seen before or ever expected to see.