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    Description

    RARE MULTI-AMMONOID PLATE
    Anetoceras advolvens, Lobobacrites sp.
    Upper Devonian, Emsian stage
    Morocco

    This fascinating plaque is of interest not only because of the presence of five well-preserved examples of the Anetoceras ammonite, but for the inclusion of two partial Lobobacrites specimens as well. Around 400 million years ago as the first ammonoid cephalopods were beginning to appear, there was a certain diversity in the form of their shells, as this plaque perfectly demonstrates. The bactrid proto-ammonoid Lobobacrites is long and straight, whilst the Anetoceras is coiled in the more familiar form, not as tightly as the later ammonites, but nonetheless more recognizable. The difference in shell form had a tremendous effect on the speed at which these animals were able to navigate through the ancient waters of what is now the Sahara Desert. The Lobobacrites was particularly slow, but with the altered distribution of buoyancy chambers within the shell and shift in center of gravity, Anetoceras could proceed faster, and those ammonoids of a completely coiled and bulbous form (as that of the nautilus) could swim the fastest of all. The plaque presented here perfectly illustrates this evolution in action, as one single order changes and improves, the better to sustain its living presence on the earth for millions of years. The largest Anetoceras measures 4½ inches across; the more complete Lobobacrites measures 7¾ inches; and the plaque itself is 20 inches wide.


    Estimate: $3,500 - $4,500.

    Condition Report*: Condition report available upon request.
    *Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Some condition issues may not be noted in the condition report but are apparent in the provided photos which are considered part of the condition report. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.

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    Auction Dates
    June, 2008
    8th Sunday
    Bids + Registered Phone Bidders: 0
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