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The Ediacaran Fauna Up until 1947 it was believed that the Cambrian Explosion marked the first true abundance of multicellular life However this was discovered to be untrue after Sir Douglas Mawson and RC Sprigg mistakenly came across numerous fossil jellyfish in the Ediacara Hills while observing what was originally believed to be sandstones belonging to the lowest strata of the Cambrian At first these finding were dismissed as fortuitous inorganic markingsAAS Biographical Memoirs Several years later however other discoveries of segmented worms worm tracks and impressions of two other assemblages that bear no resemblance to any known organism living or extinct prompted the South Australian Museum and the University of Adelaide to undertake a joint investigation of the region Further studies by M F Glaessner a paleontologist at Adelaide showed that the fossils were found well below the oldest Cambrian strata and that the strata actually dated from the Precambrian era Several thousand specimens have since been collected in the Ediacara Hills All the fossils collected were soft-bodied animals and their tissues were strengthened by spiculesneedles of calcium carbonate that functioned as their support The Ediacaran organisms were marine animals some crawled some were attached to the sea floor and others would swim or just freely float Their impressions were molded in the moving sands that washed over the mud flats and were preserved as casts in the sandstone It is difficult to conceive how fossils of delicate soft-bodied animals could be preserved given the evidence of strong currents in the strata However extensive research has provided an explanation Most of the animals settled on mud patches out of the water during calm currents Some of these patches dried between tides and developed deep cracks The next shifting current would then cover these cracks with a layer of sand and the lower surfaces preserved the mud in the form of perfect casts Glaessner 67 The nature of these soft-bodied fossils justifies
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