My cousin posted a family-holiday photo of the volcanic rocks on the beach at Bargara, Queensland.
I noticed how similar the rocks looked to the rocks at Burleigh Heads, Qld and at Fingal, NSW.
As far as I can ascertain, it is alleged that the rocks at Bargara came from a volcanic eruption some 600,000 years ago (correct me if that's wrong), while it is alleged that the rocks at Burleigh and Fingal come from an eruption some 23 million years ago (from the Tweed Shield Volcano) - yet the shape of the rocks and amount of erosion looks similar to me.
600,000 versus 23 million. Quite a difference. Yet they look so similar.
Were the rocks at Bargara subject to different levels of erosion?
Or are the rocks different?
Or has the rate of erosion differed, for some reason?
If so, why? And what evidence is there of the rates of erosion?
Or could both eruptions have happened closer together, perhaps?
Perhaps not that long ago, even?
Nowhere near as long ago, maybe.
I noticed how similar the rocks looked to the rocks at Burleigh Heads, Qld and at Fingal, NSW.
As far as I can ascertain, it is alleged that the rocks at Bargara came from a volcanic eruption some 600,000 years ago (correct me if that's wrong), while it is alleged that the rocks at Burleigh and Fingal come from an eruption some 23 million years ago (from the Tweed Shield Volcano) - yet the shape of the rocks and amount of erosion looks similar to me.
600,000 versus 23 million. Quite a difference. Yet they look so similar.
Were the rocks at Bargara subject to different levels of erosion?
Or are the rocks different?
Or has the rate of erosion differed, for some reason?
If so, why? And what evidence is there of the rates of erosion?
Or could both eruptions have happened closer together, perhaps?
Perhaps not that long ago, even?
Nowhere near as long ago, maybe.
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