Cambrien (- 590 – 505 )

Ordovicien ( - 505 – 438 )

Silurien ( - 438 – 408 )

Devonien (-408 -360)

Ere primaire
(Paléozoïque )

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Ere secondaire : ( Mésozoïque )

Trias (-215 -213)

Jurassique (-213 -144)

Crétacé (-144 -65)

Carbonifère ( - 360 - 286 )

Permien ( - 286 - 248 )

Carbonifère ( - 360 - 286 )

Permien ( - 286 - 248 )

Deducing the ancient habitats of trilobites from their surrounding matrix

Today, trilobite fossils have been found on every continent and subcontinent, and judging from the type of sediment in which they are found, we can deduce whether species were nearshore (e.g., in limestones formed from fossil fringing reefs) or from deeper habitats (e.g., marked by atheloptic species found in continental slope sediments). While it seems that the earliest Cambrian trilobites lived largely in shallower habitats, by Mid-Cambrian times the whole inshore to deep water range of biofacies was occupied by trilobites. These developed regional diagnostic genera that occupied concentric bands away from inferred shorelines, as shown in the example, taken from the Devonian shores of the Old World (Gondwana) Province (the origin of today's Moroccan trilobite beds).