Fig. 78 in Early-middle Cambrian stratigraphy and faunas from northern Siberia

Fig. 78. Sponge fragments from the lower Cambrian Erkeket Formation, Khorbusuonka River (A–F, H, I, M, N) and Tyuser Formation, lower reaches of the Lena River (G, J–L, O, P), Siberia, Russia; samples 19/10.25 (B–F, M, N), 19/11.75 (A, H, I), and 22/0 (G, J–L, O, P). A–G. Fragments of archaeocyaths, SMNH Sp11519–11525, respectively. H–P. Fragments of possible heteractinid spicules, SMNH Sp11526–11534, respectively. Scale bar: 250 µm (A, C) and 500 µm (B, D–P).