Ammonoids are extremely rare fossils, and are it is even rarer to find a complete one.

The fell has also yielded some rare fossils with unusual forms of dendroid graptolites being found on the slopes.

It may be a rare fossil, such as Archaeopteryx, which shows early features of a group which later becomes widespread.

Nosmips aenigmaticus is a rare fossil primate known only from 12 teeth.

Octopuses are some of the rarest marine fossils, since most species have no hard structures apart from a beak.

The Bridgewater is a fissile dark silty shale with relatively rare fossils.

Their latter-day counterparts would never imagine treating a rare fossil so cavalierly as to, for starters, paint it.

This rare and peculiar fossil looks rather like a sea-lily without arms, and has more than a passing resemblance to a tennis racket!

Only rare fossils of E. show any sign of a root, and that on a premolar.

In this case one farmer found a rare fossil of a toothed bird, complete with feather impressions.