It produced anoxic conditions near the bottom which resulted in the exceptional preservation of fossils during this period.

They lacked mineralised hard parts, so are only known from areas of exceptional preservation, limiting their fossil distribution.

Plants demonstrate best the great value of the exceptional preservation of the Rhynie chert.

The fossils have been found in several sites of exceptional preservation.

Its fine fossils make this a lagerstätte, a place of exceptional preservation.

On some specimens, details of the internal anatomy can be seen due to the exceptional preservation.

In either case, additional processes must have been responsible for the exceptional preservation.

A transition from an icehouse to a greenhouse world has been associated with an increase in storm intensity, which may have hindered exceptional preservation.

It is famous for the exceptional preservation of the soft parts of its fossils.

However, the part of the trackway that had not been affected by root growth showed exceptional preservation.