Abstract Tephra layers preserved in marine sedimentary archives constitute key isochronous markers for reconstructing volcanic activity and regional stratigraphic frameworks. Here we present a comprehensive geochemical dataset of volcanic glass from tephra layers identified in sediment core M72/5-25-GC1 recovered from the southwestern Black Sea. The dataset includes major and trace element compositions of volcanic glass shards from 19 tephra layers deposited in the last ~60 kyr, preserved as bot