Explain relative dating of fossils

12-Oct-2017 14:57

Palaeontologist Martin Glaessner finally, in 1959, made the connection between this and the earlier finds All specimens discovered until 1967 were in coarse-grained sandstone that prevented preservation of fine details, making interpretation difficult. Poor communication, combined with the difficulty in correlating globally distinct formations, led to a plethora of different names for the biota.

In 1960 the French name "Ediacarien" – after the Ediacaran Hills in South Australia, which take their name from aborigine Idiyakra, "water is present" – was added to the competing terms "Sinian" and "Vendian" for terminal-Precambrian rocks, and these names were also applied to the life-forms.

"Ediacaran" and "Ediacarian" were subsequently applied to the epoch or period of geological time and its corresponding rocks.

In March 2004, the International Union of Geological Sciences ended the inconsistency by formally naming the terminal period of the Neoproterozoic after the Australian locality.

These communities are now limited to inhospitable refugia, such as the stromatolites found in Hamelin Pool Marine Nature Reserve in Shark Bay, Western Australia where the salt levels can be twice those of the surrounding sea.

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Although microbial mats were once widespread, the evolution of grazing organisms in the Cambrian vastly reduced their numbers.Instead, they were interpreted as gas escape structures or inorganic concretions.

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