Saturday, August 28, 2010

Yarra Bend Park: Part Four

How long might it take to make a sedimentary layer? How long might it take to make the rock face you see opposite?
Why aren't these rocks still at the bottom of the sea?
What geological features are visible?

The length of how long it takes for a sedimentary layer to be made varies. It may happen rapidly if evaporation of salt flats create chemical sedimentary rocks or slowly, if it's gradually depositing sediments by tidal waters which can take millions of years.
It would take millions of years to make the rock face seen opposite because of tidal waters, weathering and erosion.

The rocks aren't at the bottom of the sea any more because it got all washed up and tossed up onto shore.

The geographical features that are visible are the layers of rock and the folding.

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