116
Effects of Waves and Currents
Fig. 4.16. Comet marks in the channel Store Belt, Baltic Sea, between the Danish islands of
Langeland and Lolland . Upper Sonograph of the sea floor. Length of record about 2 km , width -
150 m, water depth about 12 m. Dark spots are boulders (morainal debri s). Some boulders have a
"tail", toward left and down. These "comet marks" indicate currents from the north. [Sonography by
F. Werner, KieJ.) Lower Morphology of a typical comet mark , as seen by divers. , Obstruction
(boulder); 2 crescent scour; 3 till ; 4 residual pebble layer (fossil erosional pavement); 5 "comet tail"
of fine sand, built into erosional depression produced by turbulence behind obstacle. [F. Werner et
aI., 1980, Sediment Geol 26: 233)
Effects of Waves and Currents
Fig. 4.16. Comet marks in the channel Store Belt, Baltic Sea, between the Danish islands of
Langeland and Lolland . Upper Sonograph of the sea floor. Length of record about 2 km , width -
150 m, water depth about 12 m. Dark spots are boulders (morainal debri s). Some boulders have a
"tail", toward left and down. These "comet marks" indicate currents from the north. [Sonography by
F. Werner, KieJ.) Lower Morphology of a typical comet mark , as seen by divers. , Obstruction
(boulder); 2 crescent scour; 3 till ; 4 residual pebble layer (fossil erosional pavement); 5 "comet tail"
of fine sand, built into erosional depression produced by turbulence behind obstacle. [F. Werner et
aI., 1980, Sediment Geol 26: 233)