Geo-Marine Letters (1999) 19: 219±226 Ó Springer-Verlag 1999
نویسنده
چکیده
Highly re ̄ective linear features occur in water depths of 20±30 m in northern Bristol Bay (Alaska, USA) and are, in places, over 600 m in length. Their length-to-width ratio is over 100:1. The lineations are usually characterized by large transverse ripples with wavelengths of 1±2 m. The lineations trend about N60°E, and are spaced between 20 and 350 m. Main tidal directions near the lineations are N60°E ( ̄ood) and S45°W (ebb), which are parallel to subparallel to the lineations. They suggest that the lineations may be tidally generated. The lineations may be bright sonar re ̄ections from a winnowed lag concentrate of coarse sand.
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