This is a nice cluster of three Austerops smoothops collected near Jorf, Morocco. The trilobites are all about 1.1" in length and have nice detail including visible eye facets.
Trilobites are collected from a 15m thick section about 6km NW of Jorf, Morocco. Unlike many other localities that rocks do not have distinct deposition layers, but rather are massive. They likely represent a gigantic "mud mound" that form at the base of a volcanic island due to mud slides. The rock is very silicified, almost like a chert and can be quite colorful. The actual shell of the trilobites is translucent so that the trilobite tends to be the color of the rock below.
Because the rock contains a large amount of silica, it is extremely hard, and preparing trilobites from the site is difficult as the rock does not separate well from the shell. Within the 15m section only about 2m has been heavily collected, so occasionally this site will produce some extremely rare and one of a kind specimens collected in float from the other layers.
A view of the collecting locality NW of Jorf, Morocco
Collecting trilobites at the Jorf locality in 2015
Trilobites were a very diverse group of extinct marine arthropods. They first appeared in the fossil record in the Early Cambrian (521 million years ago) and went extinct during the Permian mass extinction (250 million years ago). They were one of the most successful of the early animals on our planet with over 25k described species, filling nearly every evolutionary niche. Due in large part to a hard exoskeleton (shell), they left a excellent fossil record.