It took only years to kill more than 90 percent of all life on Earth, according to the most precise study yet of the Permian mass extinction, the greatest die-off in the past 540 million years. Trilobites disappeared during this time.
Diminutive Cornuproetid Moroccan Trilobite Cornuproetinae indet Trilobites Order Proetida, Family Proetidae, Subfamily Cornuproetinae Geological Time: Lower Devonian Size: (25.4 mm = 1 inch): Trilobite is 11 mm long (curve measure) by 8 mm wide (with spines) on a 50 by 80 mm matrix. Fossil Site: Taouz, Morocco
Name: Pliomera fisheri Russian trilobites (Order Phacopida, Suborder Cheirurina) Age: Middle Ordovician, Asery Horizon Size: mm = 1 inch): 40 mm long by 20 mm wide on a 94 by 63 mm matrix Location: Wolchow River Region, St Petersburg, Russia