Adolf Seilacher, Cynthia Marshall, H. Catherine W. Skinner, Takanobu Tsuihiji; A fresh look at sideritic “coprolites”. Paleobiology ; 27 (1): 7–13. doi: https://doi.org/10.1666/0094-8373(2001)027<0007:AFLASC>2.0.CO;2
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Sideritic “coprolites” from the late Miocene of southwest Washington, the Upper Cretaceous of Saskatchewan and Madagascar, and the Permian of China have often been claimed to be pseudofossils. They are here interpreted as intestinal casts (cololites) prefossilized by bacterial activity and later transformed into siderite with no traces of original food particles left. All occurrences are found within fluvial overbank deposits that carry no other vertebrate remains. Their absence could be due to aquifer roll-fronts that destroyed phosphatic bones and teeth but favored siderite precipitation.