They were created in the middle of the Palaeozoic Era.

The Palaeozoic began with an explosion of life forms.

They are not common today, but in the Palaeozoic they were one of the most common types.

Another odd group that did not survive the Palaeozoic were the Rostroconchs.

These swimming habits go back into the Palaeozoic, to the Carboniferous or earlier.

Echinoids were a relatively unimportant part of the biota in the Palaeozoic.

Marine diversity increased to levels typical of the Palaeozoic, and morphological disparity was similar to today's.

The Ophiocistioidea is a class of extinct echinoderms from the Palaeozoic.

There appears to be some evidence of adaption to durophagy during the Palaeozoic, particularly in crinoids.

Brachiopods are extremely common fossils throughout the Palaeozoic.

The lower lands of today's parkland were covered by a shallow sea even in the Palaeozoic Era.

Although still a successful group today, they were extremely abundant in the Palaeozoic where their plates often form major components of marine limestones.

On the whole, the fauna that emerged in the Ordovician set the scene for the rest of the Palaeozoic.

The Edicaran is followed by the Cambrian, the first period of the Palaeozoic.

The six periods of the Palaeozoic:

Hyolitha are enigmatic animals with small conical shells known from the Palaeozoic Era.

Graptolites are commonm fossils from the Palaeozoic.

After half an hour's walking the Age of Dinosaurs had come and gone, and by midday we were deep into the Palaeozoic.

Perhaps it was the transition to land that enabled the scorpions to survive beyond the Palaeozoic, which saw the end of the sea scorpions.

Overall marine diversity reached a plateau which typified much of the rest of the Palaeozoic Era.

They proliferated in the Cambrian explosion and reached their highest diversity in the Palaeozoic.

A national standard lithostratigraphy for the Palaeozoic in the subsurface of Jordan was prepared for publication.

This approach, if valid, would enable estimates of the burial history of the Palaeozoic in this region to be considerably improved.

They were extremely common in the Palaeozoic, and some rocks from the Carboniferous consist almost entirely of fossil crinoids.

The oldest rocks proved through boreholes to exist below London are the old, hard rocks of the Palaeozoic.

They were one of the most important plant groups in the Palaeozoic era.

Continues to increase during the Palaeozoic era to present levels.

Yet, the relationship of these with the Palaeozoic forms is still poorly understood.

Only the first volume dealing with the Palaeozoic species was published (1888).

• What important event marks the beginning of the Palaeozoic era?

Radiolaria have existed since the beginning of the Palaeozoic era.

Suckered tube feet may not have been present in any Palaeozoic sea star"."

Dykes are a common, almost universal, feature of the older Palaeozoic rocks.

Other distributions, such as many of the Palaeozoic corals, evidently do not.

The first was a long period of sedimentary rock deposition during the Palaeozoic era, 200 to 500 million years ago.

These effects have created a variety of trap situations in potential Palaeozoic reservoir units.

Conductive Palaeozoic overburden is up to 50m thick in places.

These were from the Devonian period in the Palaeozoic era.

The rock types are of volcanic origin, dated to the Palaeozoic era.

They built the coral reefs of the Palaeozoic era.

Palaeozoic and Mesozoic marine sediments are found in several regions.

Pangaea was a global super continent which formed in the Palaeozoic era.

All these are of probable lower Palaeozoic origin.

The crinoids were almost wiped out by the extinction event at the end of the Palaeozoic era.

Several successive periods are represented, including all of the Palaeozoic periods.

In the 1830s and 40s geologists were beginning to unravel the mysteries of the early Palaeozoic rocks.

Fossil gastropods are less common during the Palaeozoic era than bivalves.

The Cambrian is the first geological period of the Palaeozoic era.

The basin content is dominated by the Palaeozoic succession with a reported thickness up to 3500 meters.

Throughout the country this older basement is overlain by Palaeozoic sedimentary rocks.