Fig. 71 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 71. Hexactinellid spicules from the lower Cambrian Erkeket (A–F, H–J, L–O) and Yunkyulyabit-Yuryakh (G) formations, Khorbusuonka River and Emyaksin Formation, Bol'shaya Kuonamka River (K), Siberia, Russia; samples 11/18.7 (A–F, H–J, L), 11/16.05 (M, N), 19/107 (G), 20/1B (O), and 6/0.3 K). A–D, H, J. Polyactine siliceous megascleres with acutely tapering slim curved rays, SMNH Sp11424–11429, respectively. E, F, I, M–O. Pentactines and hexactines with thin smooth rays, SMNH Sp11417–11422, respectively. G. Fragment of a pinnular pentactine, SMNH Sp11423. K, L. Abnormisella sp., SMNH Sp11415 (K) and 11416 (L). Scale bar: 250 µm (A–D, H–J, O) and 500 µm (E–G, K–N).