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| Graptolite Net | Graptolites & Graptoliters | Cephalodiscoidea | Rhabdopleuroidea | Crustoidea | Camaroidea | Tuboidea |
| ________________________________________________________________________________________ GRAPTOLITE NET is edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja A. Korwin-Kossakowska since 2002 |
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| Radiographs of pyritized graptolites from Merete Bjerreskov |
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| To the right you can see radiographs of pyritized graptolites Rhaphidograptus toernquisti (Elles &Wood, 1906), Monograptus atavus Jones, 1909, and Pseudoclimacograptus undulatus (Kurck, 1882) from the revolutus Zone, Bornholm, Denmark, published by Merete Bjerreskov (1978). Explanations: 1. Rh. toernquisti. Specimen with pyrite just outside the thecal apertures. 2. P. undulatus. Pyrite with ill defined shape protruding out from the thecal apertures. 3. Rh. toernquisti. Specimen with pyrite just outside the thecal apertures. 4. Rh. toernquisti. Pyrite precipitated outside thecal apertures and along the thecal walls along the periderm. 5. Rh. tornquisti with pyrite protruding out from the thecal apertures, and M. atavus with pyritisations only within the rhabdosome. Bjerreskov, M. 1978. Discoveries on graptolites by X-ray studies. - Acta Palaeontologica Polonica 23, 4, 462-471. |