Fig. 64 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 64. Thecal plates of Echinodermata from the lower Cambrian Erkeket Formation of Khorbusuonka River (B, C, E–O) and the middle Cambrian Sekten Formation, lower reaches of the Lena River (A, D), Siberia, Russia; samples 19/11.75 (O), 19/12.75 (J), 20/2B (I, K–M), 20/5B (B, C, F, G, N), 20/6B (E, H), and 22/67 (A, D). A–O. Thecal plates, SMNH Ec36886–36900, respectively. Scale bar 500 µm.