Found a Cool Rock

[quone]

Can anyone help identify it? I found it on a hill in my yard in Southern California. There are no other rocks like this one, but there are tons of other rocks--the hill is made up of layers. Silt with large heavy rocks (many are 7" x 10" x 6" or so), black clay, sand with small rocks, some are hard and some are what I think is gypsum.
Thanks!

 

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[dognose]

Sort of looks like it could be gypsum. What is the topography of the ground? Is it fill or natural?

 

[quone]

It's natural, like the side of a mountain. A line of houses, with slopes in the backyard, then more houses, another slope, etc.

 

[ridgehunter58]

 

[ridgehunter58]

 

[ridgehunter58]

Been away for awhile, health issues. Trying to get going again. But glad to see my account had my been deleted

 

[ridgehunter58]

Oh,and just a little rock I found

 

[ridgehunter58]

What you have there is gypsum. Area must have once been a shallow sea