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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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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 behind.  While not complex, these fossils have historic value in paleontology.  They represent an extinct [...]

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