• P241143
    • Pinner's Cross, Smith's End, S. of...
    • P241144
    • W. of Newsell's Park, N. of Barkway,...
    • P241145
    • W. of Newsell's Park, N. of Barkway,...
    • P241146
    • N. of Reed, near Royston. Chalk arching...
    • P241147
    • N. of Reed, near Royston. Chalk arching...
    • P250424
    • Ayot. Pocket of glacial gravel driven...
    • P250425
    • Ayot. Reading Sands bending down to...
    • P250426
    • Ayot. Reading Sands.
    • P250427
    • Ayot. Current-bedded Reading Sands.
    • P250428
    • Ayot. Westleton shingle.
    • P250429
    • Letchworth. Gravels piping into Chalk.
    • P250430
    • Letchworth. Gravels capping Chalk.
    • P250431
    • Near Letchworth Station. Glacial gravels
    • P250432
    • Arlesey. Section of Chalk Marl.
    • P250433
    • Arlesey. Section of Chalk Marl.
    • P250434
    • Arlesey. Totternhoe Stone with over and...
    • P242179
    • Lane to Bottom Farm, valley of the...
    • P242180
    • Gravel-pit in Bourne Valley. Converted...
    • P242181
    • Railway-cutting, Chorley Wood. Pipes...
    • P242182
    • Railway-cutting, Chorley Wood. Pipes...
    • P242183
    • Railway-cutting, Chorley Wood. Pipes...
    • P252694
    • Ayot. Reading sands disturbed probably...
    • P252695
    • Tyttenhanger Pit, St. Albans. Chalky...
    • P252696
    • Sandy Lodge, Northwood. Reading sands...
    • P252697
    • Sandy Lodge, Northwood. Reading sands...
    • P253119
    • Mimm's Hall Brook, Warrengate, Potter's...
    • P253331
    • Ayot. Section of Reading Beds.
    • P246548
    • Chadwell Spring, Hertford. Head of New...
    • P246549
    • Chadwell Spring, Hertford. Head of New...
    • P232444
    • Watford Heath, Kiln. London Clay on...
    • P232445
    • Watford, Bushey Kiln. London Clay on...
    • P232446
    • Chalk pit NW of Bushey Station,...
    • P232447
    • Chalk pit N. of Bushey Station,...
    • P247334
    • Whitehall Farm, Bishop's Stortford....
    • P247335
    • Whitehall Farm, Bishop's Stortford....
    • P233186
    • Radlett (roadside section between...
    • P233187
    • St. Albans (railway-cutting 11/2 m. N....
    • P233188
    • St. Albans (gravel pit). Hertfordshire...
    • P248062
    • Reed, 2 m. S. of Royston. Disturbed...
    • P248063
    • Reed, 2 m. S. of Royston. Disturbed...
    • P248623
    • Little Heath, near Berkhamsted. Glacial...
    • P248624
    • Little Heath, near Berkhamsted. Glacial...
    • P248625
    • Little Heath, near Berkhamsted. Glacial...
    • P248626
    • Little Heath, near Berkhamsted. Glacial...
    • P236191
    • Hatfield Hyde, Hatfield. Boulder clay...
    • P236192
    • Hatfield Hyde, Hatfield. Great Chalky...
    • P236193
    • Brickfield near Ayot Station. Pipe in...
    • P249445
    • Arlesey, Beart's Brick Works. Chalk...
    • P249446
    • Letchworth Station. Boulder Clay...
    • P249447
    • Watford Heath. Basement bed of London...
    • P249448
    • Bushey cutting. Base of London Clay and...
    • P249449
    • Oxhey golf course. Reading Sands with...
    • P249450
    • Oxhey. Bottom pebble bed of Reading...
    • P249451
    • Bishop's Stortford (cemetery). Sarsen...
    • P249452
    • Bishop's Stortford, Day's brickyard....
    • P249453
    • Bishop's Stortford, Foxdells. Section...
    • P249454
    • Bishop's Stortford, Day's brickyard....
    • P249455
    • Ware. Glacial sands and gravels.
    • P249456
    • Ware. Glacial sands and gravel.
    • P249457
    • Ware. Glacial sands and gravel, marked...