Museum Quality Bundenbach Crinoids Association Plaque

Name: Disparida (Order Uncertain); Triacrinus sp.

Age: Lower Devonian (Seigenian/Emsian Stage)

Size mm (25.4 mm= 1 inch): Calyx: 15 mm - 80 mm, 45-205 mm with stems attached on a 285 by 145 mm matrix

Location: Hunsruck Slate, Bundenbach Germany

Bundenbach CrinoidsDescription: Well-preserved example of an assemblage of EIGHT complete and partial Disparid crinoids known as Triacrinus. The Hunsruck slate is famous for its fossils, many of which have pyritization present. Rapid burial and pyritization was what led to the many wonderful examples of early Devonian life from the region. The chemistry of the silt was such that low organic content and high levels of iron and sulfur allowed the pyrite to diffuse into the tissues rather than be deposited in the sediment. The mudstones were metamorphosed into slate during the Carboniferous. The slate was quarried for roofing tiles, and the quarrymen would save the fossils for later sale. Now that the quarries are no longer open, future supplies of these wonderfully preserved benthic organisms will only come from existing collections. These specimens show a distinct orientation due to a current that flowed from left to right across the piece as pictured. The pyritization serves as an artistic counterpoint to the rich black slate, making for a truly striking display piece. Few examples of this quality are ever seen; it is the only such piece I have been able to secure in five years.

click fossil pictures to enlarge

l Fossil Mall Home l Fossils Science Section l