They first appeared in the Permian period, 295-248 million years ago.

Across the barrier, into the Permian, all the way to the beginning.

They were a successful group which lived during the Permian period, about 260 million years ago.

The group went extinct at the end of the Permian.

During the Permian the sea withdrew once more from the state.

During the Permian period, the state continued to be mostly dry land.

The stone was analyzed to be about 270 million years old from the Permian period.

About the middle of the Permian a major transition in vegetation began.

As a result, it said, the Permian acquisition would not have a significant impact on financial results.

In geology, the Permian period takes its name from the region.

The sea had completely vanished by the start of the Permian.

The first similar fossils date from the Permian period, 270 million years ago.

Not as bad as the one at the end of the Permian.

During the middle part of the Permian the seas returned to a more typical state.

Later plants from the Permian period did as well.

The Permian was also a period of adaptive radiation in insects.

By the Permian period the sea had left completely.

A gap in the local rock record spanned the Permian period.

Montana was covered by the sea again for a short interval of the Permian period.

It is mostly composed of conglomerates from the Permian period.

They were large herbivores that flourished during the Permian period.

Plants bearing these leaves went extinct around the beginning of the Permian period.

Sharks left behind their teeth to fossilize during the Permian.

At the end of the Permian, oxygen levels plummeted, and fires became less common.

A second unconformity was created after the Permian sea retreated.

Shifting red permian clay soil and Old Central's native sandstone foundation proved to be an unfortunate combination.

The Galilee Basin is a permian geological basin in the western Queensland region of Australia.

But she was lucky; only her greenhouse was shattered in this village of houses built of red permian sandstone from the local quarry a few miles away.

Orthacanthus was featured in the Shark Week special "Prehistoric Sharks", where it was labelled as the terror of permian swamps.

In the permian region he made a number of frescos, mosaics, sgrafittos and cereamic high reliefs and also three big gobelens.

West of Doncaster the coal measures are overlain by younger rocks, permian limestone, and the area to the east of this is referred to as the concealed coal field.