Paul D Stewart / Pithecanthropus europeaus alalus (european speechless ape-man) by Gabriel Max, 1894, reproduced as Photogravure Plate 29 in Ernst Haeckel 'Naturliche Schopfungs-Geschichte' (Natural History of Creatio...

Paul D Stewart / Fossil Trilobite (Triarthus eatoni) showing rare pyrites preservation of the limbs and antennae. From the late Ordovician 'Beecher's Bed' of Oneida County, New York, USA. The site is named after Charl...

Paul D Stewart / Skull of extinct lemur (Mesopropithecus dolichobrachion) with calcite surface crystalisation, discovered by the photographer in the Ankarana Caves of Northern Madagascar. Pictured on site in 1987, the...

Paul D Stewart / Nemiana simplex, a White Sea Ediacaran fossil (upper Vendian) in the sandstone shales from the Novodnestrovsky Quarry, Podolia, Ukraine. The ediacaran biota existed from about 580 to 540 million years...

Paul D Stewart / Skull of Cave Bear (Ursus uralensis), an extinct species of bear found in western Russia's Ural mountians and region. It is one of a complex of large extinct 'speleoid' or 'cave bear like' species tha...

Paul D Stewart / Putative cryogenian cnidarian fossil impressions from the Ranford formation of Australia, of a form reminiscent of the modern Porpita porpita (blue button colonial hydroids). The structure has also be...

Paul D Stewart / Illustration of Wooly Rhinoceros (Coelodonta antiquitatis) skull, copperplate engraving from the work of Sir Everard Home before 1823.

Chris Shields / Illustration of the a pre-dinosaur tetrapod, the Pelycosaur (Dimetrodon). Lived from Early Permian to Middle Permian about 220 Ma ago.

Chris Shields / Illustration of the dinosaur Compsognathus,about the size of a turkey. Lived in the late Jurassic, 150 Ma ago.

Chris Shields / Illustration of the dinosaur Coelophysis,living in the Late Jurassic / Early Triassic, 203-216 Ma ago.

Philippe Clement / Tourists looking over standing stones of the Menec alignments from panoramic terrace of the Maison des megalithes at Carnac, Brittany, France, September 2019

Philippe Clement / Reconstructed 2500 year old crannog, prehistoric dwelling at the Scottish Crannog Centre on Loch Tay near Kenmore, Perth and Kinross, Scotland, UK. June 2018

Philippe Clement / Reconstructed 2500 year old crannog, prehistoric dwelling at the Scottish Crannog Centre on Loch Tay near Kenmore, Perth and Kinross, Scotland, UK. June 2018

Philippe Clement / Tourist visiting Mousa Broch, tallest Iron Age broch and one of Europe's best-preserved prehistoric buildings, Shetland Islands, Scotland, UK. June 2018. Digital composite