PT Unknown AU Hornung, J TI Submersible ground penetrating radar (SGPR) – chances and limits for underwater investigations SE Advances in On- and Offshore Archaeological Prospection: Proceedings of the 15th International Conference on Archaeological Prospection PY 2023 BP 21 EP 24 PU Universitätsverlag Kiel | Kiel University Publishing DI 10.38072/978-3-928794-83-1/p3 WP https://macau.uni-kiel.de/receive/macau_mods_00003442 LA en DE archeology; Lake Constance; Neolithic boulder mounds; sedimentology; underwater ground penetrating radar; archaeological prospection; archaeology; geophysics; remote sensing; subsurface imaging; Archäologische Prospektion; Archäologie; Geophysik; Fernerkundung; Bildgebung des Untergrunds SN 978-3-928794-83-1 AB Results of submerged ground penetrating radar (SGPR) measurements show spectacular detailed depositional structures of lake floor sediments, which could not be revealed with any other geophysical method yet. Due to its very high resolution, GPR is particularly suitable for archeological prospection on land surfaces and now on lake floors. A case study showed that a submerged archaeological site in Lake Constance (boulder mounds, the so-called “Hügelis”) is interfingering with the sedimentary record. Depositional history reveals that the site must be human-made and dates back to the prehistorical period. 14C ages of sediment and wood poles proved Neolithic age of the more than 170 boulder mounds comprising over 80,000 metric tons of rock. PI Kiel ER