In general, the concretions form from CO3-- produced by the microbiological degradation of organic matter in the presence of abundant Fe++ or Mn++ and very low S-- concentrations. However, there is also some evidence for diagenetic replacement of pre-existing calcite by siderite.-from Authors
CITATION STYLE
Von Rad, U., & Botz, R. (1987). Authigenic Fe-Mn carbonates in Cretaceous and Tertiary sediments of the continental rise off eastern North America, Deep Sea Drilling Project Site 603. Initial Reports DSDP, Leg 93, Norfolk, Virginia to Norfolk, Virginia Part 2, 1061–1077. https://doi.org/10.2973/dsdp.proc.93.144.1987
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