δ18O values from −17.1‰ to 1.2‰ and −25.9‰ to −2‰, respectively. The weathering process of Hellenistic and Byzantine are expressed, by the regression lines δ18Ocalcite matrix= 0.6 ×δ13Ccalcite matrix− 1.9 and δ18Ocalcite matrix= 0.6 ×δ13Ccalcite matrix− 2.0 for ...