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| Graptolite Net | Graptolites & Graptoliters | Relationships of Graptolites | Rhabdopleuroidea | Cephalodiscoidea |
| GRAPTOLITE NET edited by Piotr Mierzejewski, the Count of Calmont and Countess Maja A. Korwin-Kossakowska since 2002 |
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| Dictyonema crassibasale Gurley |
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| Dictyonema crassibasale Gurley, sometimes attaining a great size (0.5 m!), usually, however, of more moderate dimensions, is the most common species of Dictyonema in the chert-dolomite series at Hamilton, Ontario. To the right is the specimen (ca. 32 cm in diameter) originated from the Hamilton, Ontario, Lockport limestone (Silurian), illustrated by Rudolf Ruedemann (1947). Ruedemann (1925) recorded this beautiful form also from the Gasport lens of the Lockport limestone in which two portions of broadly cyathiform rhabdosome overlap in such a way as to suggest that the rhabdosome hay have grown upward in a flat spiral (Ruedemann 1926). The New York State Museum has a perfect specimen of this species with a diameter of 10 inches. ___________ Source: Ruedemann, R. 1947. Graptolites of North America. - Geol. Soc. Amer., Mem. 19, 1-652, pl. 1-92. |
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