I'll add to David spot on statements.
Coral head islands have large outcroppings of coral and the beach sand
is coral. Parrot fish with beaks like parrots Chomp down on a living
coral, crush it and have lunch. Then flakes of coral flow out the
gills. They create massive coral 'sand' flows. I suppose this is a
way to make the coral grow to reclaim area. I used to skin dive and
drive down to 10 or more meters to collect shells in coral sand. I saw
this on Kwajalein Atoll in the Marshall Islands in the 60's.
This is a massive CO2 bank stored in thousands of feet of coral walls
making the atoll.
Martin Eastburn
On 11/17/2023 9:19 AM, David Campbell wrote:
> Shallow water also tends to be more saturated with carbonate ions,
> which makes it easy for both biological and abiological processes to
> produce carbonate minerals. Many parts of the very deep ocean are
> undersaturated in carbonate to the point of making carbonates dissolve
> if they sit around long enough.
>
> The carbonate saturation level relates to pH, so increasing CO2 makes
> it harder to make shells.
>
> On Thu, Nov 16, 2023 at 10:52 PM Susan and Ed <[log in to unmask]>
> wrote:
>
> 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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> --
> Dr. David Campbell
> Associate Professor, Geology
> Department of Natural Sciences
> 110 S Main St, #7270
> Gardner-Webb University
> Boiling Springs NC 28017
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