A year or so ago a friend of mine was moving to a new job, and he decided to downsize his collection and concentrate on his real interest, elasmobranchs (sharks/rays) and fish.  As a result I inherited a number of fossils, including a Moroccan trilobite.  It had a few cracks that had been crudely "repaired" with clay.  Recently I decided to "restore" it, which means I removed the clay (toothbrush prep) and returned it to it's unaltered state.  I initially thought it was one of the common Flexica