Deltal

Lacustrine deposits of clay, and more rarely sand and alluvial sediments of clay, sand, and gravel, complete the recent deposits. A considerable deltal island has formed at the mouth of Horn river where it enters Fawn and Mink[…]

[…] filled with alluvial deposits which finally rose above sea level except at the mouths of the valleys where wave action has been sufficiently strong to carry the sediment seaward and thus prevent the accumulation of deltal deposits.

Inevitably, as deltal and alluvial deposits encroached upon the basins, the lakes pour […]