Were trilobites colourful?

Yes, Trilobites are good index fossils. They are wide spread appearing around the world. They have variations that are distinctive for each rock formation or time period. They are used therefore to identify similar formations in stratigraphic columns in other areas related to a study. read more

Trilobites were strictly marine and lived only in the Paleozoic Era, 541-252 million years ago. Their uniqueness, diversity, and absence from the modern world provided early support for the once radical concepts of extinction, evolution, and plate tectonics. read more