A great example of a group of four Phacops Trilobite Fossils on a Limestone matrix. Trilobites are extinct arthropods. Their black colour is due to the chemical processes affecting the rock, causing the animals to petrify entirely. Their habitat was salt water.
Age: Lower Devonian, Approx 350 million years old.
Hamar L’aghdad Limestone deposits of Djbel Issoumour, Moroccan Sahara.
20.2cm x 22.5cm x 7.2cm, 3350g. Largest Trilobite 12cm x 7cm x 2.6cm.