Top Posts Tagged with #sheet cavity

Here's an example of a sedimentary structure called a sheet cavity! The grey-white lines within the yellow dolomite matrix. These structures are diagnostic of ancient reef-structures, and the calcareous composition further points towards reef-related beginnings.

This sample is from the Flinders Ranges in South Australia, where some of the oldest known animal fossils can be found, the Ediacara. It is also home to the only geological time period defined within Australia.

#dolomite #primary dolomite #sheet cavity #sedimentary structure #reef #coral reef #flinders ranges #australia #geology #original post

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