In Massachusetts Bay there is a belt of subangular pebbles roughly paralleling the shore which is a lag concentrate formed by the washing out of the finer constituents of fluvio-glacial deposits. Although in shallow water, and exposed to the full force of easterly gales, this bottom is relatively undisturbed, as the pebbles are still angular to subangular, and some of them covered with red, calcareous algae. Bottom topography is irregular as the result of glacial deposition. Although working on unconsolidated deposits, the sea has not been able to smooth out these irregularities and develop a well-graded profile.

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