A high-resolution acoustic survey camed out in the channels of La Maddalena Archipelago revealed a number of bedforms and buried morphologies related sea-level changes during the last eustatic cycle. The Wiirmian sea-level fall and lowstand is witnessed by erosional surfaces and incision of the pre-Wiirmian sediments. Terraced surfaces of the seafloor in the depth interval 33-47 m testify that some sea-level still stands occurred during the Holocene sea-level rise. The onset of the present-day sedimentary and hydrodynamic conditions at 5000-6000 years B.P. favoured the formation and the maintenance of large-scale bedforms, such as sand ridges and sand waves.
FEATURES AND BEDFORMS OF THE LAST EUSTATIC CYCLE IN THE LA MADDALENA ARCHIPELAGO (NORTH SARDINIA, ITALY) FROM HIGH-RESOLUTION ACOUSTIC DATA
DEMURO, SANDRO
2009-01-01
Abstract
A high-resolution acoustic survey camed out in the channels of La Maddalena Archipelago revealed a number of bedforms and buried morphologies related sea-level changes during the last eustatic cycle. The Wiirmian sea-level fall and lowstand is witnessed by erosional surfaces and incision of the pre-Wiirmian sediments. Terraced surfaces of the seafloor in the depth interval 33-47 m testify that some sea-level still stands occurred during the Holocene sea-level rise. The onset of the present-day sedimentary and hydrodynamic conditions at 5000-6000 years B.P. favoured the formation and the maintenance of large-scale bedforms, such as sand ridges and sand waves.
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