>  Dear All:
>  Does anyone know of a citation dealing with the erosion of shell apices
>  and umbos from leaching of calcium because of low suspended calcium in
>  the water.....as opposed to non-eroded shells in water with high calcium
>  content?
>
>  Assitance will be greatly appreciated....trying to finish up a
>  long-languishing manuscript....
>

I know that Wendell Haag determined that a few years were enough to dissolve an entire unionid shell in the Sipsey River, but I don't know if he published it.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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