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Mon, 20 Nov 2000 17:47:09 -0500
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I do not know about fossil traces attributable to land snails, but traces of marine radula scratches are known starting in the late Precambrian (mostly in Seilacher's work; I think it is Radulichnus but am rather unsure on spelling).

    Dr. David Campbell
    "Old Seashells"
    Biology Department
    Saint Mary's College of Maryland
    18952 E. Fisher Road
    St. Mary's City, MD  20686-3001 USA
    [log in to unmask], 301 862-0372 Fax: 301 862-0996
"Mollusks murmured 'Morning!'.  And salmon chanted 'Evening!'."-Frank Muir, Oh My Word!

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