Mammoth tusk in a riverbed near Doubtful village, Wrangel Island, UNESCO World Heritage Site, Chuckchi Sea, Chukotka, Russian Far East, Russia, Eurasia

A huge fossilized ammonite embedded in the rocks at Winspit near Worth Matravers, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

A mineralised ammonite fossil at the base of Burton Bradstock cliffs, Jurassic Coast, UNESCO World Heritage Site, Dorset England, United Kingdom, Europe

Dinosaur foot prints in the rock on the mountains behind Morija Guest house, Lesotho, Africa

Dinosaur foot prints in the rock on the mountains behind Morija Guest house, Lesotho, Africa

Dinosaur foot prints in the rock on the mountains behind Morija Guest house, Lesotho, Africa

Bighorn sheep petroglyph, Petrified Forest National Park, Arizona, United States of America, North America

Petrified wood and an eroded hill, Petrified Forest National Park, Arizona, United States of America, North America

Hand pictographs, Honanki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

Petroglyphs, Petrified Forest National Park, Arizona, United States of America, North America

Pictographs, Palatki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

Pictographs, Honanki Heritage Site, Coconino National Forest, Arizona, United States of America, North America

People in the interior rooms of the Zoological Museum, University of Copenhagen, Denmark, Europe

Dinosaur hall, children, Museum of Natural History, Berlin, Germany

Overhead view compass world map

Snow-covered volcanic landscape with volcanic sand and petrified lava, crater of Askja volcano, Icelandic highlands, Iceland, Europe

Stromatolites, Earth's oldest fossils, Hamelinbay, Northwest Australia

Stromatolites, Earth's oldest fossils, Hamelinbay, Northwest Australia

Giganotosaurus, Royal Tyrell Museum, Drumheller, Alberta, Canada

Dinosaur Hall of the Royal Tyrell Museum, Drumheller, Alberta, Canada

Tyrannosaurus rex, Royal Tyrell Museum, Drumheller, Alberta, Canada

Royal Tyrell Museum, Drumheller, Alberta, Canada

Royal Tyrell Museum, Drumheller, Alberta, Canada