Abstract: Organisms as carbonate producers in modern and ancient mavine environments were investigated in our countryrecentyears in detail because of preserving biochemical history on their shells. in this study, the relations amongfossil species, environmental conditions and modem geological anomalies were scarched throughly by dceermintng paieontologic, mineralogical and geochemical features of some modern foraminiferal shells. Foraminiferal tests collectedfrom two submarine sediment samples in İskenderun Bay were studied by whole-rock (XRD and AAS) and microprobemethods, and in this way elements being the cause of colorful on the shells were semi-quantitatively / quantitativelyneasured. ıı genus and 17 species of modern foraminifers were observed in these samples. Green, black, pınk, grayand yellow coloredparts are observed in the encountered foraminiferal species. Foraminiferal shells of Sample No. 36nainfy contain aragonite and Mg-calcite, less anhydrite, dolomite and quartz. Foraminiferal shells of Sample No. 125ire made up of abundantly calcite, Mg-calcite, aragonite and rarely dolomite, auartz and siderite. The richnesses inZu, Zn and Pb were determined although element concentrations of foraminifer shells show a variation in wide range.`t is explained that an abnormal contamination within the shells are caused by enrichments in the sea water ofionsransported with hot waters comingfrom active faults. Moreover, it should be expected that these elements are secondırily got rich during metabolism by livings. Mg/Ca ratios ofshells vary between 11.63 and 219.23. A temperature of11-51 "C arefound by setting up a relationship between Mg/Ca ratio of calcites in benthic foraminifers and sea-floorvater temperature. The anomaly in the sea-floor water temperature and richness in the concentrations ofsome elenents can indicate hydrothermal springs related to present fracture lines.