The Neolithic Flint Mines of Spiennes occupy two chalk plateaux (OUV statement)

waters flowing over the limestone and chalk ...the presence of carbonate rocks, including both limestone and chalk from the Mesozoic Era

on cool, chalky land, the Champagne Hillsides, Houses and Cellars form a very specific agro-industrial landscape (OUV statement)

Silbury Hill is the largest prehistoric mound in Europe. Built around 2400 BC, it stands 39.5 m high and comprises half a million tonnes of chalk. (OUV statement)

Maresha–Bet Guvrin is an eminent example of traditional use of chalk subsurface strata (OUV statement)

the property includes chalk cliffs (OUV statement)

The landscape's distinctive aesthetics, flat chalk plains out of which rise almost conical hills with fortified settlements on top (OUV statement)

"Stevns Klint, known as the Cliffs of Stevns in English, is a white chalk cliff" (wiki)

Chalk is a significant feature of the Dorset and East Devon Coast e.g, the Old Harry Rocks. The Nomination file contains 51 references to Chalk.