Dr Liam Herringshaw: An Introduction To Geological Maps.

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Presentation transcript:

Dr Liam Herringshaw: An Introduction To Geological Maps

Recommended text Geological Structures and Maps (Lisle) (or Bennison et al. / Barnes & Lisle)

Course structure 1. Introduction 2. Uniformly dipping strata 3. Folded strata 4. Faults 5. Unconformities 6. Igneous Rocks 7. Metamorphic cleavage 8. Maps in 4D

Introduction Maps & Geology Why map geology and how? How to read geological maps?

Introduction Scarborough sheet: First impressions?

Why map? Ordnance Survey: – military Geological Survey: – economic – scientific

What is a geological map? How does it differ from a 'normal' map? – Interpretive, not just descriptive – = Predictive science

William 'Strata' Smith Origins

Smith & Nephew The Mapping of Yorkshire

What to map? Depends on scale and subject – what are you trying to show?

What to map? What units are mappable? 1:1000 scale 1 mm on map = 1 m wide 1:250,000 scale 1 mm on map = 250 m wide Observed vs inferred features

Topography Learn to read the landscape

What to map? Superficial: also known as 'Drift' mapping

What to map? Bedrock or 'Solid' Geology

Next week: Uniformly dipping strata

Next week: Uniformly dipping strata Useful tools: Protractor, ruler, pencils, paper

Resources ( Geology of Britain Viewer: iGeology: Vale of York bedrock/superficial maps: Link to paper Maps Before Maps: