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Sediment coloring


Vnaz50

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San Antonio, Tx 

I was curious as to what would cause a difference in sediment coloring? This piece isn’t like the other hardened sediment pieces I’ve found in my yard. The others are more brown or tan in color. 

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  • 2 weeks later...

One thing I learned to read in the descriptions of rock units is the differences between "weathered" and "fresh".   For example the bright white "Austin Chalk" often weathers black.  The same is true for many of our Hill Country  limestones.  Not sure what causes what but I would guess if you cracked that in half the inside would be a more typical tan.

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