Page 429 - Introduction to Paleobiology and The Fossil Record

416 INTRODUCTION TO PALEOBIOLOGY AND THE FOSSIL RECORD

(a) (b)

(c) (d)

(e) (f)

(h) (i) (j) (k) (l)

(g)

(m) (n)

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, (b–f, k, m) Early Ordovician graptoloids;
(g–j, l) Late Ordovician graptoloids; and (n) a Silurian monograptid. (Courtesy of Henry Williams.)