Buy Dactylioseras Ammonite Nodule - Dactylioseras Ammonite Nodule for sale at Earthdeposits.co.uk

A rare Dactylioseras Ammonite from Whitby showing how two halves of a split, rounded boulder knit closely together, because the remains of a coiled cephalopod ammonite forms most of the rock and the split occured along the creatures shell wall. This happens because the molecules in the shell of the creature may contain a harder element, such as potassium that makes it a slightly better lithified or petrified rock than the molecules in the surrounding matrix rock. The microscopic crystal lattice may also have kept some of its binding texture.