Fig. 2 in Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia

Fig. 2. Exposure of the source strata for the blocks with nautiloids found a few kilometers upstream the Angara River. A. Transition from the Ust-kut to Iya Formation. B. Top of the limestone succession of the Ust-kut Formation. C. Columnar stromatolite and limestone of the Ust-kut Formation. D. Field sketch of the section showing position of conodont samples and probable correspondence between the strata exposed and the loose blocks.