Mass properties of immersed clastic sediments ranging from sand to clayey silt are described for a small area of the bottom in the lower-Chesapeake Bay estuary. These properties involve (1) grain shape, size, composition, surface texture, orientation, and packing of solid particles, (2) liquid composition and (3) gaseous composition. Investigation of animal-sediment relationships showed poor correlation between grain size and infauna distribution and no correlation between mass properties and animal distribution.

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