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(by tina negus)
The Marston Marble above consists of a whole lot of Promicroceras, an extinct ammonite genus from the Early Jurassic. Their shells are evolute, and are decorated by strong and simple straight ribs that flatten over the venter (belly). These ammonites are more commonly found in the United Kingdom.
(via geologise)
Wow. I can see this as a beautiful countertop.