Where to Find Hertfordshire Puddingstone in the UK

Hertfordshire Puddingstone—a distinctive conglomerate of flint pebbles in silica matrix—is found only in Hertfordshire, England. Notable locations include:

• Brocket Hall: Outcrops visible in the parkland.
• Hatfield House: Used in garden features and park walls.
• St Albans Cathedral: Medieval construction incorporates puddingstone.
• Berkhamsted Castle Ruins: Walls contain the stone.
• Roads & Buildings: Historically used for road surfacing, kerbstones, and foundations across the county due to its hardness.

Geological Note

Formed ~55 million years ago (Paleocene), it’s a remnant of ancient riverbeds cemented by silica. Its unique appearance makes it a local geological icon.

Most sites are on private or managed land; view from public paths or with permission.