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   Boundary      

The following photos show the boundary layer that exists between the 49 million years old "red" rock and the 13 million year old "gray" rock.   The important thing to notice is how little happened in those 36 million years.

Here you can obviously see the yellow boundary layer.  At the top part of the picture is a layer of the red rock.  Below that is the yellow layer that represents the 36 million years that passed between the times that the two stages of lava flowed to make the Frass rock. 

This represents the same view under different lighting conditions.   It is hard for me to imagine any place on the planet Earth that could protect this rock so that nothing happened for most of 50 million years.

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