Daily Archives: May 1, 2011

Wooster’s Fossils of the Week: Hyoliths (Middle Ordovician of Estonia)

The fossils above are about as simple as fossils can be. They are internal molds (sediment-fills) of conical shells that were made of the carbonate mineral aragonite.  The aragonite shells dissolved away after death and burial, leaving the cemented sediment … Continue reading

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