LAMINITES IN THE CAMBRIDGE ARGILLITE (EDIACARAN), HEWITT'S COVE, HINGHAM, MASSACHUSETTS

Laminated Cambridge Argillite of the Boston Bay Group (Ediacaran) low-grade metasediments can be found in outcrop at Hewitt's Cove, Hingham, Massachusetts. These laminated sediments are finely graded layers 2 to 8 cm thick that are commonly interpreted in the literature as fine-grained turbidites (Stow sequences). Rhythmically laminated facies also occur that do not support a sediment-gravity flow interpretation. These rhythmites raise the possibility of sedimentation influenced by agents such as tides, waves, or wind. The Cambridge Argillite appears to consist of a subtle, but definite, mosaic of laminite facies that record multiple depositional processes, and perhaps multiple water depths.