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Laminated Cambridge Argillite of the Boston Bay Group at Hewitt's Cove, Massachusetts

The Cambridge Argillite represents the fine-grained component of the Boston Bay Group, which is in itself a portion of the Neoproterozoic Avalon Terrane. Historically, the majority of the research conducted on the Boston Bay Group has focused on the coarsegrained conglomerates that make up the Roxbury Group, neglecting the laminated Cambridge Argillite. However, this laminated muddy facies contains Aspidella, Ediacaran fossils of Neoproterozoic Age. Very little is known about the paleoecology of these organisms, which were first described in the Boston Bay Group by T. H. Clark in 1923 (McMenamin, 2004). The depositional setting of the laminated argillite that hosts the Aspidella fossils still remains elusive. Previous studies have suggested that the Cambridge Argillite represents a basinal depositional setting (Bailey and Bland, 2001). However, the features present in these rocks do not exclusively indicate a deep-sea environment of deposition. The purpose of this study was to determine the depositional processes and interpret the depositional setting of a measured section of the Cambridge Argillite. These data could provide insight into the paleoecology of the Ediacaran Aspidella fossils present within this formation.

Cambridge Argillite; Boston Bay Group; Neoproterozoic; Avalon Terrane; Aspidella; Ediacara

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