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KSircombe@ksircombe.bsky.social |
The layer is >95% quartz cobbles which takes a *lot* of geological effort to produce by removing everything else. Modern fluvial flows get to 50% quartz on a good day. It’s broadly ‘Cenozoic’ because it’s difficult to directly date. And must have had steep gradients to move things along.
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KSircombe
@ksircombe.bsky.social
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The working theory is that at some point in the last 60 Ma SE Australia saw a lot of rain perhaps to the point of being tropical, it was rugged and possibly way more tectonically active than we give it credit for. Find more about the mystery gravels in the linked paper...
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