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Survey Details for CNWGL027 - 2026-06-07

CNWGL027

Geological Landscape

Afon Gyffin valley

Conwy

2008-10-24

  • Level 1: Lowland hills and valleys
  • Level 2: Lowland river and drainage systems
  • Level 3: Active lowland river-flood plain system

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?

  • Lowland river valley floodplain of tributary Afon Gyffin draining SW-NE into Afon Conwy. Fault-controlled valley separates SE dipping Ordovician mudstone-dominated succession on N side and Silurian mudstones, siltstones and sandstones to S. Alluvial fan deposits from tributary valleys to W.

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?

  • Alluvial

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

  • Silt

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

  • Active lowland river-flood plain system

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

  • Superficial deposits
    • alluvium
  • Structural features
    • NE-SW fault
  • Active processes
    • fluvial

Q7 - What additional subsidiary Level 3 components are notable?

  • No Answer

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

  • Flood plain

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

  • fluvial
  • Empty value

Q10 - Are there components of significant hydrological importance?

  • Yes
    • tributary to Conwy

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?

  • No

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
    • River valley floodplain of tributary to Conwy

Q17 - Condition

  • Fair
    • River valley floodplain of tributary to Conwy

Q18 - Trend

  • Constant
    • River valley floodplain of tributary to Conwy

Recommendations

Q19 - Existing management

  • Generally Appropriate

Q20 - Existing management remarks:

  • No specific management requirements

Q21 - Principal management recommendations

  • Monitor integrity of valley geomorphology

Q22 - Guideline

  • Long Term
    • Monitor integrity of valley geomorphology
  • Long Term

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
    • Resources: 1:25 000 and 1:10 000 OS Raster Map Sheets; 1:50 000 BGS Geological Map Sheets; Digital Terrain Model compiled from OS panorama digital terrain data (50m resolution); 1:10 000 aerial photographs; 1:100 000 Groundwater vulnerability map sheet

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

  • OS Raster

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

  • 1:10,000 and 1:25,000

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

  • river valley floodplain

Evaluation

Q29 - Evaluation Criteria: Research Value

  • Moderate
    • River valley floodplain of tributary to Conwy

Q29a - Evaluation Criteria: Educational Value

  • Low
    • River valley floodplain of tributary to Conwy

Q30 - Evaluation Criteria: Historical Value

  • Moderate
    • River valley floodplain of tributary to Conwy

Q31 - Evaluation Criteria: Rarity / Uniqueness

  • Moderate
    • River valley floodplain of tributary to Conwy

Q32 - Evaluation Criteria: Classic Example

  • Moderate
    • River valley floodplain of tributary to Conwy

Q33 - Evaluation Criteria: Overall Evaluation

  • Moderate
    • River valley floodplain of tributary to Conwy

Q34 - Justification of overall evaluation

  • River valley floodplain of tributary to Conwy

Bibliography

Q35 - Sources and additional assessments

  • Llandudno (S&D), 1989. 1:50 000, E94, British Geological Survey; Conwy (S&D), 1989. 1:25 000 Classical Areas Map, SH77, SH78, British Geological Survey; North Wales Coast, 1990. 1:100 000 Groundwater Vulnerability Map, Sheet 15, Environment Agency; Warren, P.T., Price, D., Nutt, M.J.C. and Smith, E.G., 1984. Geology of the country around Rhyl and Denbigh. Memoir for 1:50 000 geological sheets 95 and 107, and parts of 94 and 106 (England and Wales). British Geology Survey. HMSO, London, 217p;

Assessment

Q36 - Additional Assessments

  • Empty value

Q37 - Additional Comments

  • Empty value