I was going to say the exact same thing.

Susan Hewitt

> On Nov 16, 2023, at 7:20 PM, Allen Aigen <[log in to unmask]> wrote:
> 
> Probably the encrustations are from calcareous algae which grows best with lots of light, like in shallow water.
> Allen Aigen
> Staten Island NY
> 
> On Thursday, November 16, 2023 at 05:02:16 PM EST, John Varner <[log in to unmask]> wrote:
> 
> 
> Is it my imagination, or are shells found in shallow water more likely to be encrusted with calcium deposits?  And why is that? 
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