When once-living organisms are transformed into rocks or leave impressions or imprints within rocks, then those rocks are referred to as fossils, and the process is known as fossilization.

The fossils are found inside ironstone concretions. When the rock was cracked open, there was an impression of a spider-like ...

The discovery of a 69-million-year-old bird fossil is reshaping our understanding of avian evolution.

Micro-impressions of small, developing seeds were visible in the fossil's fruits. The research team could also see stamens — flowers' male reproductive organs — which in most plant species ...

Zombie fossil? This is an artist's impression of an undead T. rex. The missing parts are the result of degradation of the body after death. Disclaimer: AAAS and EurekAlert! are not responsible for ...

A ‘one of a kind’ fossil discovery could transform our understanding of how the unique brains and intelligence of modern birds evolved, one of the most enduring mysteries of vertebrate evolution.

Examine remarkable fossil evidence of long-ago events in the Last Impressions gallery. From 200-million-year-old wave ripples on beach sand to a petrified tree stump, dinosaur footprints, and a giant ...