Fig. 1 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis

Fig. 1. Two SEM images illustrating different aspects of Goniocamax sp. from the Turonian of Northern Siberia, Piasina River, Western Taymyr Peninsula. A. UPS−1483, polished and etched longitudinal section of a rostrum showing the aragonitic region (a, white) and the calcitic region (c, black). B. UPS−2451, longitudinal fracture showing a part of the phragmocone (p) with some septa visible, and rostrum (r).