DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Petrified faeces (also called fossil poop or dung) of turtles as found in alluvial Cretaceous to Paleocene deposits near Mahajanga in Madagascar. The petrified substance of the coprolites is largely composed of the minerals limonite and siderite. Actual size is in the range 10 to 20 cm.
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