List of RIGS

Those RIGS (regionally important geodiversity sites) within Fforest Fawr Geopark are listed first, followed by those in the rest of the Brecon Beacons National Park. All are to be found (though not identified) on OS 1:25,000 scale Explorer map sheet OL12 unless otherwise noted*

  1. Aberbran to Abercamlais Terraces
    OS grid ref: SN 970292
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: geomorphology, sedimentology
    ◦ Unitary authority: POWYS
  2. Afon Hepste & Afon Mellte Karst
    ◦ OS grid ref: SN 941122, SN952111, SN 933121
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: karst, geomorphology
    ◦ Unitary authority: POWYS
  3. Afon y Waen
    ◦ OS grid ref: SN 971156 to SN 974 139
    ◦ RIGS category: Scientific, Aesthetic
    ◦ Earth science interest: stratigraphy, palaeontology
    ◦ Unitary authority: POWYS
  4. Allt Troedrhiwfelen Stream Section
    ◦ OS grid ref: SN 785342 to SN 789339
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy, sedimentology, palaeontology
    ◦ Unitary authority: POWYS
  5. Blaen Senni
    ◦ OS grid ref: SN 910194
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  6. Blaen Taf Fawr Landslip
    ◦ OS grid ref: SN 991206
    ◦ RIGS category: Scientific
    ◦ Earth science interest: landslip
    ◦ Unitary authority: POWYS
  7. Breinant
    ◦ OS grid ref: SN 652224 to SN 658223
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy
    ◦ Unitary authority: CARMARTHENSHIRE
  8. Carn Pen-y-clogau
    ◦ OS grid ref: SN 722186
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: geomorphology
    ◦ Unitary authority: CARMARTHENSHIRE
  9. Carreg Cennen Castle
    ◦ OS grid ref: SN 668191 *(partly on OS Exp186)
    ◦ RIGS category: Scientific, Educational, Aesthetic, Historical
    ◦ Earth science interest: stratigraphy, karst, structure
    ◦ Unitary authority: CARMARTHENSHIRE
  10. Carreg yr Ogof
    ◦ OS grid ref: SN 778214
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: stratigraphy, structure, sedimentology, geomorphology
    ◦ Unitary authority: CARMARTHENSHIRE
  11. Cefn Crai
    ◦ OS grid ref: SN 888282
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy, sedimentology
    ◦ Unitary authority: POWYS
  12. Cefn Cul
    ◦ OS grid ref: SO 016196
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  13. Cil-maen-llwyd Quarry (Long Quarry)
    ◦ OS grid ref: SN 665207 *(on OS Exp186)
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: stratigraphy, palaeontology, sedimentology, industry
    ◦ Unitary authority: CARMARTHENSHIRE
  14. Coed Duon
    ◦ OS grid ref: SN 709255
    ◦ RIGS category: Scientific, Aesthetic
    ◦ Earth science interest: stratigraphy
    ◦ Unitary authority: CARMARTHENSHIRE
  15. Corn Du & Pen y Fan
    ◦ OS grid ref: SO 002216 to SO 024215
    ◦ RIGS category: Scientific, Aesthetic
    ◦ Earth science interest: stratigraphy, sedimentology
    ◦ Unitary authority: POWYS
  16. Cradoc Moraine
    ◦ OS grid ref: SO 008305
    ◦ RIGS category: Scientific, Historical
    ◦ Earth science interest: geomorphology, sedimentology
    ◦ Unitary authority: POWYS
  17. Craig Cwm-du
    ◦ OS grid ref: SN 942214
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  18. Craig Derlwyn Quarry
    ◦ OS grid ref: SN 720160
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: stratigraphy
    ◦ Unitary authority: CARMARTHENSHIRE
  19. Craig y fro Ridge Features
    ◦ OS grid ref: SN 974208
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: geomorphology
    ◦ Unitary authority: POWYS
  20. Crwcas
    ◦ OS grid ref: SO 041276
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy, palaeontology
    ◦ Unitary authority: POWYS
  21. Cwm Crew
    ◦ OS grid ref: SO 008198
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  22. Cwm Cynwyn
    ◦ OS grid ref: SO 034212
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  23. Dan-yr-Ogof
    ◦ OS grid ref: SN 835159
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: karst, Variscan structures, lower Carboniferous stratigraphy
    ◦ Unitary authority: POWYS
  24. Dinas Silica Mines
    ◦ OS grid ref: SN 916079
    ◦ RIGS category: Aesthetic, Historical
    ◦ Earth science interest: stratigraphy, mine, quarries, landscape, industrial, historical
    ◦ Unitary authority: RHONDDA CYNON TAF POWYS
  25. Fan Bwlch Chwyth
    ◦ OS grid ref: SN 916224
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  26. Fan Dringarth Landslide
    ◦ OS grid ref: SN 943193
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: sedimentology, geomorphology
    ◦ Unitary authority: POWYS
  27. Fan Gyhirych
    ◦ OS grid ref: SN 887194
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  28. Ffrwdgrech Moraine
    ◦ OS grid ref: SO 042279
    ◦ RIGS category: Scientific
    ◦ Earth science interest: sedimentology, geomorphology
    ◦ Unitary authority: POWYS
  29. Garn Goch
    ◦ OS grid ref: SN 689242
    ◦ RIGS category: Scientific, Aesthetic
    ◦ Earth science interest: stratigraphy, history
    ◦ Unitary authority: CARMARTHENSHIRE
  30. Henllys Vale
    ◦ OS grid ref: SN 762137
    ◦ RIGS category: Scientific, Educational, Historical
    ◦ Earth science interest: stratigraphy, industry
    ◦ Unitary authority: CARMARTHENSHIRE, POWYS
  31. Herbert’s Quarry
    ◦ OS grid ref: SN 734191
    ◦ RIGS category: Scientific, Educational, Aesthetic, Historical
    ◦ Earth science interest: stratigraphy, industry
    ◦ Unitary authority: CARMARTHENSHIRE
  32. Llanfrynach
    ◦ OS grid ref: SO 084254
    ◦ RIGS category: Scientific
    ◦ Earth science interest: sedimentology, geomorphology
    ◦ Unitary authority: POWYS
  33. Llygad Llwchwr
    ◦ OS grid ref: SN 669178 *(partly on OS Exp178)
    ◦ RIGS category: Scientific, Aesthetic
    ◦ Earth science interest: karst, industry
    ◦ Unitary authority: CARMARTHENSHIRE
  34. Llywel & Twyn-y-felin
    ◦ OS grid ref: SN 872300
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy, sedimentology
    ◦ Unitary authority: POWYS
  35. Maen Du Well
    ◦ OS grid ref: SO 039296
    ◦ RIGS category: Scientific, Historical
    ◦ Earth science interest: structure, geomorphology, spring
    ◦ Unitary authority: POWYS
  36. Mynydd Myddfai Tilestone Quarries
    ◦ OS grid ref: SN 787282 – SN 819303
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: structure, geomorphology
    ◦ Unitary authority: CARMARTHENSHIRE
  37. Ogof Ffynnon Ddu
    ◦ OS grid ref: SN 869158
    ◦ RIGS category: Scientific, Educational, Historical
    ◦ Earth science interest: karst, structure, industry
    ◦ Unitary authority: POWYS
  38. Pantymaes Quarry
    ◦ OS grid ref: SN 913264
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: stratigraphy, sedimentology, palaeontology
    ◦ Unitary authority: POWYS
  39. Penlan Quarry, Penlantelych Farm
    ◦ OS grid ref: SN 784333
    ◦ RIGS category: Scientific, Educational
    ◦ Earth science interest: stratigraphy, structure, palaeontology
    ◦ Unitary authority: CARMARTHENSHIRE
  40. Pen Milan
    ◦ OS grid ref: SN 998227
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: Quaternary, geomorphology
    ◦ Unitary authority: POWYS
  41. Porth yr Ogof
    ◦ OS grid ref: SN 928124
    ◦ RIGS category: Scientific, Educational, Aesthetic, Historical
    ◦ Earth science interest: karst
    ◦ Unitary authority: POWYS
  42. Priory Groves
    ◦ OS grid ref: SO 045290
    ◦ RIGS category: Scientific, Educational, Aesthetic, Historical
    ◦ Earth science interest: stratigraphy, sedimentology, geomorphology
    ◦ Unitary authority: POWYS
  43. Pwll-calch Quarried Crags
    ◦ OS grid ref: SN 767285
    ◦ RIGS category: Scientific
    ◦ Earth science interest: stratigraphy, palaeontology, sedimentology
    ◦ Unitary authority: CARMARTHENSHIRE
  44. Tair Carn Uchaf
    ◦ OS grid ref: SN 694175
    ◦ RIGS category: Scientific, Educational, Aesthetic
    ◦ Earth science interest: geomorphology
    ◦ Unitary authority: CARMARTHENSHIRE
  45. Upper Cefn Cerrig Road & Farm Section
    ◦ OS grid ref: SN 774323 – SN 775322
    ◦ RIGS category: Scientific, Historical
    ◦ Earth science interest: stratigraphy, palaeontology, history, sedimentology
    ◦ Unitary authority: CARMARTHENSHIRE

The following 35 RIGS have been designated in the east of the National Park, outside of Fforest Fawr Geopark. All are to be found (though not identified) on OS 1:25,000 scale Explorer map sheet OL13 unless otherwise noted*

46. Abercriban Quarry
◦ OS grid ref: SN 066124 *(on OS ExpOL12)
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology
◦ Unitary authority: POWYS

47. Blaen Caerfanell
◦ OS grid ref: SN 054193 *(on OS ExpOL12)
◦ RIGS category: Scientific, Educational, Aesthetic
◦ Earth science interest: Quaternary, geomorphology
◦ Unitary authority: POWYS

48. Blaen Onneu Quarry
◦ OS grid ref: SN 154169
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, palaeo-environments, sedimentology
◦ Unitary authority: POWYS

49. Blaen Pig and Canada Tips
◦ OS grid ref: SN 237116
◦ RIGS category: Scientific, Historical
◦ Earth science interest: stratigraphy, sedimentology, engineering geology, industry/history
◦ Unitary authority: MONMOUTHSHIRE, TORFAEN

50. Bloodstone
◦ OS grid ref: SN 283240
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

51. Carno Adit & Ogof Carn
◦ OS grid ref: SN 164126
◦ RIGS category: Scientific, Historical
◦ Earth science interest: history, karst
◦ Unitary authority: BLAENAU GWENT

52. Clydach Halt Limeworks
◦ OS grid ref: SN 234128
◦ RIGS category: Scientific, Educational, Historical
◦ Earth science interest: stratigraphy, palaeo-environments, palaeontology
◦ Unitary authority: MONMOUTHSHIRE

53. Coed Pantydarren Quarries
◦ OS grid ref: SN 219138
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology, structure
◦ Unitary authority: MONMOUTHSHIRE

54. Craig-y-Gaer Quarry
◦ OS grid ref: SN 223132
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology, palaeontology
◦ Unitary authority: MONMOUTHSHIRE

55. Cusop Dingle
◦ OS grid ref: SO 233421 – SO 257384
◦ RIGS category: Scientific
◦ Earth science interest: stratigraphy, palaeo-environments, sedimentology
◦ Unitary authority: POWYS, HEREFORDSHIRE

56. Cwm Coed Spillway
◦ OS grid ref: SO 284210 – SO 307217
◦ RIGS category: Scientific
◦ Earth science interest: geomorphology
◦ Unitary authority: MONMOUTHSHIRE

57. Cwm Oergwm
◦ OS grid ref: SO 043204 *(on OS ExpOL12)
◦ RIGS category: Scientific, Educational, Aesthetic
◦ Earth science interest: Quaternary, geomorphology
◦ Unitary authority: POWYS

58. Cwm Pwllfa
◦ OS grid ref: SO 068207 *(on OS ExpOL12)
◦ RIGS category: Scientific, Educational, Aesthetic
◦ Earth science interest: Quaternary, geomorphology
◦ Unitary authority: POWYS

59. Darren-Cwmyoy Landslide
◦ OS grid ref: SO 299233
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

60. Darren Ddu Tramway Quarries
◦ OS grid ref: SO 217127 – SO 222130
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology
◦ Unitary authority: MONMOUTHSHIRE

61. Drum and Monkey Quarry
◦ OS grid ref: SO 217127 – SO 219129
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology
◦ Unitary authority: MONMOUTHSHIRE

62. Dyffryn Crawnon
◦ OS grid ref: SO 095150 – SO 090155 *(on OS ExpOL12)
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology, palaeontology
◦ Unitary authority: POWYS

63. Dyffryn Mawr
◦ OS grid ref: SO 251157
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

64. Gilwern & Pwll Du Quarries
◦ OS grid ref: SO 247126 – SO 249117
◦ RIGS category: Scientific, Educational, Historical
◦ Earth science interest: stratigraphy, palaeontology, palaeo-environments, sedimentology
◦ Unitary authority: MONMOUTHSHIRE

65. The Hermitage
◦ OS grid ref: SO 227251
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

66. Llanddetti Moraine
◦ OS grid ref: SO 124217
◦ RIGS category: Scientific
◦ Earth science interest: geomorphology
◦ Unitary authority: POWYS

67. Llanfellte
◦ OS grid ref: SO 130215 to 135254
◦ RIGS category: Scientific
◦ Earth science interest: geomorphology
◦ Unitary authority: POWYS

68. Maes-y-ffin Cwm
◦ OS grid ref: SO 254307
◦ RIGS category: Scientific
◦ Earth science interest: geomorphology
◦ Unitary authority: MONMOUTHSHIRE, POWYS

69. Mynydd Llangatwg Caves (incl. Clydach Gorge)
◦ OS grid ref: SO (multiple localities)
◦ RIGS category: Educational, Aesthetic, Historical
◦ Earth science interest: karst, landscape
◦ Unitary authority: POWYS, MONMOUTHSHIRE, BLAENAU GWENT

70. Mynydd Llangynidr
◦ OS grid ref: SO 148136
◦ RIGS category: Scientific, Educational, Aesthetic, Historical
◦ Earth science interest: geomorphology, karst
◦ Unitary authority: POWYS, BLAENAU GWENT

71. Mynydd Llangynidr Caves
◦ OS grid ref: SO 128152, SO 129150, SO 140153, SO 164127
◦ RIGS category: Scientific, Aesthetic, Historical
◦ Earth science interest: karst, geomorphology
◦ Unitary authority: POWYS, BLAENAU GWENT

72. Nevill Hall
◦ OS grid ref: SO 284143
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

73. Ogof Draenen
◦ OS grid ref: SO 254114
◦ RIGS category: Scientific, Educational, Aesthetic, Historical
◦ Earth science interest: stratigraphy, karst
◦ Unitary authority: MONMOUTHSHIRE

74. Pen Cerrig-calch
◦ OS grid ref: SO 218223
◦ RIGS category: Scientific, Aesthetic
◦ Earth science interest: stratigraphy, structure
◦ Unitary authority: POWYS

75. Primrose Hill Quarry
◦ OS grid ref: SO 207200
◦ RIGS category: Scientific
◦ Earth science interest: stratigraphy, palaeontology
◦ Unitary authority: POWYS

76. Pwll y Wrach
◦ OS grid ref: SO 162328
◦ RIGS category: Scientific, Educational
◦ Earth science interest: stratigraphy, sedimentology
◦ Unitary authority: POWYS

77. Stanton Fluvio-glacial Terrace
◦ OS grid ref: SO 311215 – SO 324208
◦ RIGS category: Scientific
◦ Earth science interest: sedimentology, geomorphology
◦ Unitary authority: MONMOUTHSHIRE

78. Table Mountain & the Darren Landslip
◦ OS grid ref: SO 225207 – SO 212212
◦ RIGS category: Scientific, Educational, Aesthetic
◦ Earth science interest: stratigraphy, landslide
◦ Unitary authority: POWYS

79. Tremynfa Quarry
◦ OS grid ref: SO 159223
◦ RIGS category: Scientific
◦ Earth science interest: stratigraphy, sedimentology
◦ Unitary authority: POWYS

80. Ysgyryd Fawr
◦ OS grid ref: SO 330178
◦ RIGS category: Scientific, Aesthetic
◦ Earth science interest: stratigraphy, landslide
◦ Unitary authority: MONMOUTHSHIRE