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Top left: Promicroceras, looks like it will have a bite mark. This is a missing section of the outer coil, normally at the back of the body chamber. This is thought to be where a predator has broken the shell to cut through the back of the ammonites body to remove it from the shell.
Top centre: Promicroceras in Yellowstone
Top right: Small Microderoceras that has not yet developed ribbing and spines.
Bottom Left: Block with a nice Promicroceras and a very small Asteroceras. Will probably contain some more Promicroceras.
Bottom Right: A Microderoceras just visible of the broken edge of the block. The outer coil is a bit crushed (common with Xipheroceras and Microderoceras!), but the middle will be good calcite.
Lyme Regis, UK
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