Fig. 4
From: Chamelea gallina growth declined in the Northern Adriatic Sea during the Holocene Climate Optimum
Shell ageing methods. (a) external growth rings on the surface of C. gallina after shell scanning; (b) internal growth rings in the shell section; (c) samples of C. gallina with drilling “spots” from the umbo to the ventral edge to determine δ18O values along the shell growth axis; d) sinusoidal sequence of lower (summer, red arrows) and higher (winter, blue arrows) δ18O values recorded by the shells.
