Figures

Figure 15.23   Some graptolite genera: (a) Rhabdinopora (2), (b) Tetragraptus (2), (c) Tetragraptus, proximal end (20), (d) Isograptus, proximal end (20), (e) Xiphograptus (20), (f) Isograptus (10), (g) Appendispinograptus (2), (h) Dicranograptus (2), (i) Dicellograptus (2), (j) Orthograptus (2), (k) Undulograptus (2), (l) Nemagraptus (2), (m) Didymograptus (Expansograptus) (20) and (n) Atavograptus (2). (a) An Early Ordovician dendroid, (bf, k, m) Early Ordovician graptoloids; (gj, l) Late Ordovician graptoloids; and (n) a Silurian monograptid. (Courtesy of Henry Williams.)

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