| Name | Mineral | OS Sheet |
| Alwalton | Limestone | TL |
| Alwalton Lynch Escarpment | Marble | TL |
| Anstey | Chalk | TL |
| Barrington | Chalk | TL |
| Barton Mills | Chalk | TL |
| Batford | Chalk | TL |
| Bedwell | Chalk | TL |
| Bennett's End | Chalk | TL |
| Carleton Grange | Chalk | TL |
| Chadwell | Chalk | TL |
| Chalk Farm | Chalk | TL |
| Codicote | Chalk | TL |
| Eastgate | Chalk | TL |
| Great Cornard | Chalk | TL |
| Grimes Graves | Flint | TL |
| Harpenden | Chalk | TL |
| Hatfield | Chalk | TL |
| Horringer Court | Chalk | TL |
| Jacqueline Close | Chalk | TL |
| Kensworth | Chalk | TL |
| Kings Langley | Chalk | TL |
| Linton | Coal | TL |
| London Colney | Chalk | TL |
| Nassington | Clay | TL |
| Oaklands | Chalk | TL |
| Pakenham | Chalk | TL |
| Roughdown Common | Chalk | TL |
| Rye Street | Chalk | TL |
| Shenley | Chalk | TL |
| Silsoe | Sandstone | TL |
| Stanground | Sand/Gravel | TL |
| Steeple Morden | Chalk | TL |
| Sudbury | Chalk | TL |
| Taflins | Chalk | TL |
| Thetford | Chalk | TL |
| Upper Sundon | Chalk | TL |
| Westley Bottom | Chalk | TL |
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