Fig. 3 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis

Fig. 3. Secondary electron images illustrating the microstructures in Goniocamax sp. (A–D) and fossil molluscs (E–G); all samples from the Turonian of N Siberia. A. UPS−2435, adjacent calcitic and aragonitic zones; the growth lines are not clearly visible in the calcitic zones. B. UPS−2460, non−compact, thin calcite prisms. C. UPS−2459, aragonitic sectors with preserved growth lines. D. UPS−2460, growth lines in the well−preserved aragonite. E. UPS−2448, aragonite nacreous of an ammonite shell. F. UPS−2591, crossed lamellar layer of a fossil gastropod. G. UPS−2587, nacreous layer of an inoceramid shell.