Image of a chalk cliff at Dover, England

Photo by Tarik Haiga on Unsplash

Engraved illustration of 19th-century scientists at work in a quarry

"Strata of Tilgate Forest" from "Illustrations of the Geology of Sussex" (1827)

Image of an open grassy valley in southern England

The North Downs • Photo by Clem Rutter (CC BY 2.5)

Image of two people observing a large flat skeleton displayed in a museum

The "Hall of Flat Beasts" at the Natural History Museum, London • Photo by Fernando Losada Rodríguez (CC BY-SA 4.0)

Image of a rocky mountain valley with a chain of small lakes

Coumaknock, Mount Brandon • Photo by SteuveFE (CC BY 2.0)

Image of an assortment of colored pieces of chalk against a dark background

Photo by Alexander Grey on Unsplash

Image of a lake in Western Australia

The Kununurra region of Western Australia, where zebra rock is found • Photo by Reise-Line (CC BY-SA 3.0)

Image of fossilized ammonites encased in stone

Fossilized Hildoceras ammonites • Photo by Petr Hykš (CC BY-NC 2.0)

Image of a fossil trilobite encased in a stone

A fossil trilobite • Photo by PxHere

Image of fossil ammonoid encased in stone

A fossil ammonoid • Photo by Hectonichus (CC BY-SA 3.0)