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. 2017 Mar 29;284(1851):20170059. doi: 10.1098/rspb.2017.0059

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© 2017 The Author(s)

Published by the Royal Society. All rights reserved.

PMC Copyright notice

Figure 1. — Suvorovella aldanica Vologdin and Maslov, 1960, Aim Formation, Ediacaran; Siberian Platform, Republic of Sakha (Yakutia), Russia. (a) Detail of shell inner lower surface showing outer flat zone with diamond-shaped pattern and concentrically arranged chambers. (b) Detail of shell showing folded apex and outer flat zone with diamond-shaped pattern, latex mould of inner lower surface, PIN no. 5119/1063. (c) Reconstruction, diameter 100 mm. (d) Field photograph of shell bed of whole and broken Suvorovella shells. (e) Photomicrograph of thin section showing micritic envelopes (arrowed) around Suvorovella, encrusted by an isopachous crust of early diagenetic radial fibrous dolomite cement. (f) SEM image of detail of outer upper surface of shell at the apex showing concentric ribs and uneven surface. (g) SEM image of broken shell edge showing micrite envelope (M) encrusted by early marine radial fibrous dolomite cement (D). Specimens figured in a, b, f, and g are housed in the Palaeontological Institute named after A.A. Borisyak, Russian Academy of Sciences, Moscow (PIN).