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

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ORTHOCONE: STRAIGHT-SHELLED NAUTILOIDS

Orthocone Nautiloid FossilAn orthocone is an unusually long, straight shell of a nautiloid cephalopod. You have likely seen them from Ontario or Morocco. These straight-shelled nautiloids rules our seas during the Ordovician, nothing else was even close in size to them. To put that into context, they would have been more than two times longer than the tallest person you know. During the 18th and

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