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    Various genera
    Late Carboniferous, Pennsylvanian subperiod
    Llewellyn Formation, St Claire, Schuylkill Co., Pennsylvania, USA
    These fossil leaves, of various genera and species, appear at first glance to be ferns. They are actually the leaves of giant tree-like plants ranging from about 30 to 150 feet tall, and they bore seeds rather than reproducing by spores as ferns do. Thus, this extinct family of plants is commonly known as "Seed Ferns". Fossils similar to the present specimen were used to delineate the geological timeline of North America, representing the Pennsylvanian period. This lasted from about 318 to 299 million years ago, following the Mississippian subperiod from 359-318 million years ago, two halves of the Carboniferous period. The state of Pennsylvania is particularly rich in rocks and fossils from this time, providing the period's name. However, it is only in the St Claire area that these fossils are commonly coated with the white mineral Pyrophyllite, on a dark, charcoal gray slate-like shale. Even here, most are either dirty and impossible to clean because of the flakey and fragile nature of the Pyrophyllite; or likewise, so much of the white coating may be absent or adhering to the other parts of the rock that the fossils are irredeemably marred. In addition, there may also be too many fossils overlapping and frequently, due to the twisted, slate-nature grain of the shale, large pieces are nearly impossible to extract. Thus, when a large specimen such as this emerges, with a remarkably artistic-looking array of very white fossils on an unusually thick shale matrix, 17 inches high by 13 inches wide at the base, a truly rare and exquisite masterpiece is at hand. The surface has been preserved with hairspray to stabilize the Pyrophyllite coating, and a little glue to stabilize the natural cracks in the shale, but it is a virtually 100% natural fossil, and that is a rarity indeed.
    Provenance: Ex. Hugh Ronemus Collection, collected by HR and William Deans 10.25.2011.

    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. Heritage does not guarantee the condition of frames and shall not be liable for any damage/scratches to frames, glass/acrylic coverings, original boxes, display accessories, or art that has slipped in frames. All lots are sold "AS IS" under the Terms & Conditions of Auction.

    Auction Info

    Auction Dates
    May, 2012
    20th Sunday
    Bids + Registered Phone Bidders: 4
    Lot Tracking Activity: N/A
    Page Views: 1,525

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