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Survey Details for CRMRTGL059 - 2026-06-13

CRMRTGL059

Geological Landscape

Henllan Amgoed

Carmarthenshire

2008-12-30

  • Level 1: Lowland hills and valleys
  • Level 2: Undulating lowland hill terrain
  • Level 3: Undulating lowland hill terrain

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?

  • Undulating areas of Ordovician mudrock outcrop between the Cwmfelin-boeth and Taf valleys. Rises from around 60-70 m in the S to around 160m in the N.

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

  • Sedimentary

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

  • Ordovician

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

  • Mudstone

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?

  • Undulating lowland hill terrain

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

  • Stratigraphic formation(s)
    • 'Tetragraptus Beds' dominates [ORDOVICIAN, ARENIG - ?LLANVIRN], minor 'Didymograptus Shales' ('Bifidus Beds') [ORDOVICIAN, LLANVIRN: ABEREIDIAN].
  • Superficial deposits
    • Probable minor glacial till and fluvial alluvium in valleys [QUATERNARY: PLEISTOCENE (DEVENSIAN)-HOLOCENE].
  • Active processes
    • Stream, spring
  • Past processes
    • glacial

Q7 - What additional subsidiary Level 3 components are notable?

  • No Answer

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

  • Slope
  • Hill top
  • Spring

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

  • Stream, spring
  • Empty value

Q10 - Are there components of significant hydrological importance?

  • Yes
    • Stream, spring

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

  • No

Q12 - Is there current mineral extraction?

  • No

Q13 - Has there been mineral extraction in the past?

  • Yes
    • Not known

Q14 - Are there SSSI/GCR sites here?

  • Yes
    • Llanfallteg Track Section SSSI (SN157202) [Llanfallteg GCR site: Ordovician, Arenig-Llanvirn]

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

  • No

Condition

Q16 - Value

  • Outstanding
    • Includes GCR / SSSI features of national / international importance.

Q17 - Condition

  • Good
    • Rural area with no significant development.

Q18 - Trend

  • Constant
    • Rural area with no significant development.

Recommendations

Q19 - Existing management

  • Generally Appropriate

Q20 - Existing management remarks:

  • Rural area with no significant development.

Q21 - Principal management recommendations

  • Ensure that no features or natural systems of geological or geomorphological significance in the area are lost or damaged (e.g. due to development or forestry).

Q22 - Guideline

  • Long Term
    • Ensure that no features or natural systems of geological or geomorphological significance in the area are lost or damaged (e.g. due to development or forestry).

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?

  • Most
    • Aspect Area boundaries surveyed at 1:10,000 using aerial photographs, mapped at 1:25,000.

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

  • Other
    • 1:50,000 British Geological Survey maps, 1:10,000 aerial photographs (as stereo pairs), OS 1:25,000 Landranger topographical maps.

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

  • 1:25,000

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

  • Empty value

Evaluation

Q29 - Evaluation Criteria: Research Value

  • Outstanding
    • Includes GCR / SSSI features of national / international importance.

Q29a - Evaluation Criteria: Educational Value

  • High
    • Includes GCR / SSSI features of national / international importance.

Q30 - Evaluation Criteria: Historical Value

  • Outstanding
    • Includes GCR / SSSI features of national / international importance.

Q31 - Evaluation Criteria: Rarity / Uniqueness

  • Outstanding
    • Includes GCR / SSSI features of national / international importance.

Q32 - Evaluation Criteria: Classic Example

  • Moderate
    • Includes GCR / SSSI features of national / international importance.

Q33 - Evaluation Criteria: Overall Evaluation

  • Outstanding
    • Includes GCR / SSSI features of national / international importance.

Q34 - Justification of overall evaluation

  • Includes GCR / SSSI features of national / international importance.

Bibliography

Q35 - Sources and additional assessments

  • ORDNANCE SURVEY 2005a., Explorer Map 177 (1:25, 000); INSTITUTE OF GEOLOGICAL SCIENCES 1976, Wales Sheet 228 (Drift), 1:50,000 Geological Series; STRAHAN, A. et al. 1914, Memoirs of the Geological Survey (England and Wales), HMSO. ORDNANCE SURVEY 2006b, Explorer Map OL36 (1:25, 000). BRITISH GEOLOGICAL SURVEY (in prep., 2008), Sheet 210, 1:50 000 Geological Series; RUSHTON, A.W.A. et al. 1999, Geological Conservation Review Series 18, JNCC.

Assessment

Q36 - Additional Assessments

  • None

Q37 - Additional Comments

  • Additional Level 4 features include: Stream; Disused quarry; Marsh/bog/fen