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Survey Details for BRCKNGL667 - 2026-06-04

BRCKNGL667

Geological Landscape

Myarth

Brecknockshire

2003-11-20

  • Level 1: Mountain and upland valley
  • Level 2: Glaciated mountain terrain
  • Level 3: Glacial mountain valley

Monitoring

Q1 - Date of monitoring?

  • No Answer

Q1a - Monitoring undertaken by

  • No Answer

Q1b - Has this record been updated following monitoring work?

  • No Answer

Q1c - Change indicated by

  • No Answer

Q1d - What has changed?

  • No Answer

Q1e - Has the information ever been verified in the field?

  • No

Q2 - Does this area have a special or functional link with an adjacent area?

  • No

Description

Q3 - If Classification is "Other", specify here

  • Empty value

Q4 - What is the geographical and topographical character of this area?

  • Gently S dipping Senni Beds capped by Brownstones on elongate, steep hill ridge E-W, to N of Usk channel but surrounded by floodplain sediments of fluvioglacial sand and gravels. Boulder clay on lower slopes. Sandstone bands forming 'steps' on slopes

Q4a - Where bedrock dominated, what is the dominant bedrock type?

  • No Answer

Q4b - Where bedrock dominated, what is the age that characterises the aspect area?

  • No Answer

Q4c - Where bedrock dominated, what is the major rock lithogy (-ies)?

  • No Answer

Q4d - Where drift dominated, what is the dominant drift deposit?

  • No Answer

Q4e - Where drift dominated, what is the major sediment that characterises the area?

  • No Answer

Q5 - What is the characteristic Level 3 component of the area?

  • Glacial mountain valley

Q6 - Which of the following is a significant contributor to the geological character of the area?

  • Stratigraphic formation(s)
    • Senni Beds
  • Superficial deposits
    • Boulder Clay
  • Active processes
    • Fluvial
  • Past processes
    • Glacial, fluvioglacial

Q7 - What additional subsidiary Level 3 components are notable?

  • Other
    • dissected upland plateau

Q8 - What Level 4 components are notable in this area?

  • Stepped topography

Q9 - What active geological and geomorphological processes are significant in this area?

  • Fluvial
  • Empty value

Q10 - Are there components of significant hydrological importance?

  • Yes
    • Usk

Q11 - Are there any pedological processes that are significant in the area or have had a landscape forming effect?

  • Yes
    • Intermediate permeability soils

Q12 - Is there current mineral extraction?

  • No

Q13 - Has there been mineral extraction in the past?

  • Yes
    • Sandstone

Q14 - Are there SSSI/GCR sites here?

  • No

Q15 - Are there geological SINC, 2nd tier, or RIGS sites in the area?

  • No

Condition

Q16 - Value

  • Moderate
    • Upland ridge of ORS Senni Beds capped by Brownstones

Q17 - Condition

  • Good
    • Upland area

Q18 - Trend

  • Constant

Recommendations

Q19 - Existing management

  • Generally Appropriate

Q20 - Existing management remarks:

  • Beneficial - BBNP

Q21 - Principal management recommendations

  • Conserve as existing

Q22 - Guideline

  • Long Term
    • Preserve integrity of geomorphological feature

Tolerance To Change

Q23 - Are there any significant threats to the current integrity and condition of the Earth Heritage features of the area?

  • Not known

Aspect Area Boundary

Q24 - To what level was this information site-surveyed?

  • Level 3

Q25 - At 1:10,000, how much of the Aspect Area boundary is precise?

  • None

Q26 - What baseline information source was used for Aspect Area boundary mapping?

  • Other
    • 1:25 000 OS Explorer Map Sheets; 1:50 000 BGS Geological Map Sheets; Digital Terrain Model compiled from OS panorama digital terrain data (50m resolution)

Q27 - If OS Data was used, what was the scale?

  • 1:25,000

Q28 - What is the justification for the Aspect Area boundaries?

  • Usk floodplain to S and N and Rhiangoll floodplain

Evaluation

Q29 - Evaluation Criteria: Research Value

  • Moderate
    • ORS Senni Beds - Brownstones

Q29a - Evaluation Criteria: Educational Value

  • Unassessed

Q30 - Evaluation Criteria: Historical Value

  • Moderate
    • ORS Senni Beds- Brownstones

Q31 - Evaluation Criteria: Rarity / Uniqueness

  • Moderate
    • ORS Senni Beds- Brownstones

Q32 - Evaluation Criteria: Classic Example

  • Moderate
    • Upland ridge of ORS Senni Beds capped by Brownstones

Q33 - Evaluation Criteria: Overall Evaluation

  • Moderate
    • Upland ridge of ORS Senni Beds capped by Brownstones

Q34 - Justification of overall evaluation

  • Upland ridge of ORS Senni Beds capped by Brownstones

Bibliography

Q35 - Sources and additional assessments

  • 1:50 000 BGS Geological Map Sheet 232 Abergavenny (Solid and Drift) 1990; 1:1" BGS Geological Map Sheet 214 Talgarth ; Digital Terrain Model compiled from OS panorama digital terrain data (50m resolution); 1:100 000 Groundwater Vulnerability Map, Environment Agency. Sheet 28, Powys, 1996; 1:100 000 Groundwater Vulnerability Map, Environment Agency. Sheet 36, Gwent, South and Mid Glamorgan, 1996; Barclay, W.J. 1989. Geology of the South Wales coalfield. Part 2, The country around Abergavenny. Memoir of the British Geological Survey, Sheet 232, 3rd ed., H.M.S.O., London, 147p; 1:625 000 Geological Map of the UK: Quaternary Geology, S sheet, 1977; 1:25 000 OS Explorer Map Sheet OL13 Brecon Beacons National Park, Eastern Region

Assessment

Q36 - Additional Assessments

  • Empty value

Q37 - Additional Comments

  • Empty value