The Silurian Upper Burgsvik and Lower Hamra-Sundre Beds, Gotland
The facies represent five depositional environments: a beach, a fore-shore, a surf, a shallow marine current, and an off-shore environment. The diversity and colony shape of tabulates in facies IV is related to discrete physical and biological factors. The succession of facies reflects a transgressive sequence. Land was situated in the north-west.
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Stel, J.H, & de Coo, J. C. M. (1977). The Silurian Upper Burgsvik and Lower Hamra-Sundre Beds, Gotland. Scripta Geologica, 44, 1–43.