Distinctive UK landscapes: geology and landscape character
OCR J383 Paper 1 opens with the UK landscapes topic. You must be able to identify and explain the distribution of upland and lowland landscapes and understand how geology determines landscape character and the processes that operate.
UK landscape overview
The UK can be divided into broadly two landscape types:
Upland landscapes (generally north and west)
- Scottish Highlands: ancient metamorphic and igneous rocks; U-shaped glacial valleys, corries, aretes.
- Lake District: hard volcanic and metamorphic rock; dramatic glaciated scenery; England's wettest area.
- Snowdonia (Wales): hard igneous and metamorphic rocks; glaciated peaks (Snowdon, 1,085 m).
- Pennines: carboniferous limestone and millstone grit; moorland plateaux; potholes and caves.
- Dartmoor: granite dome; moorland; tors (exposed rock outcrops).
- Brecon Beacons: old red sandstone; escarpments; waterfalls.
Lowland landscapes (generally south and east)
- London Basin: clay vale; flat; densely populated; Thames floodplain.
- East Anglia: chalk and clay; very flat; highly productive farmland.
- The Weald and Downs: chalk escarpments (South Downs, North Downs); dry valleys.
- Somerset Levels: flat floodplain; peat bogs; flood-prone.
Geology and landscape
Rock types
| Rock type | Examples in UK | Resistance to erosion | Landscape |
|---|---|---|---|
| Igneous (crystalline, formed from magma) | Granite (Dartmoor, Cairngorms); basalt (Giant's Causeway) | Very resistant | High, rugged moorland; tors |
| Metamorphic (formed by heat/pressure) | Slate (Snowdonia, Lake District); schist (Scottish Highlands) | Very resistant | Steep, angular mountains |
| Sedimentary — limestone | Carboniferous limestone (Pennines, Yorkshire Dales) | Soluble; moderately resistant | Karst features (pavements, caves, gorges) |
| Sedimentary — chalk | South and North Downs; Chilterns; Yorkshire Wolds | Permeable; moderately resistant | Smooth, rounded hills; dry valleys; escarpments |
| Sedimentary — clay | London Basin; Weald Clay; Oxford Clay | Weak; erodes easily | Flat vales; waterlogged soils; wide river valleys |
| Sedimentary — sandstone | Old Red Sandstone (Brecon Beacons) | Moderately resistant | Rolling hills; reddish soils |
How geology shapes landscape
Hard rocks (granite, slate, basalt):
- Resist erosion → form uplands and high ground.
- Joint/fracture patterns control where erosion occurs.
- Rivers erode in V-shaped valleys in hard-rock uplands.
Soft rocks (clay, weak sedimentary):
- Erode quickly → form lowlands and vales.
- Fine sediment transported easily → wide, meandering rivers on floodplains.
Permeable rocks (chalk, sandstone):
- Water passes through rather than running off → fewer surface streams.
- Chalk downlands: dry valleys (formed during periglacial periods when permafrost prevented percolation).
Impermeable rocks (granite, clay):
- Water cannot pass through → more surface runoff → more erosion; wetter soils.
Rock structure
- Scarp and vale topography: alternating hard and soft rock bands tilted at an angle → soft rock erodes to form a vale; hard rock forms an escarpment (steep face) and a dip slope (gentler face).
- Example: the North and South Downs — chalk escarpments dip gently south/north; fronted by Weald Clay vales.
- Synclinal and anticlinal structures: folded rock creates basins (synclines, like the London Basin — filled with Thames alluvium) and ridges (anticlines).
The influence of glaciation
The majority of the UK's upland landscapes were shaped by Quaternary glaciation (the last ice age, ending ~10,000 years ago):
| Glacial feature | Where in UK | How formed |
|---|---|---|
| U-shaped valley | Lake District (Wastwater, Ullswater); Welsh valleys | Glacial erosion (abrasion + plucking) widened and deepened V-shaped river valleys |
| Corrie (cirque) | Scottish Highlands; Snowdonia | Rotational glacial erosion on a north/east-facing slope; ice drills a hollow |
| Arete | Scottish Highlands; Snowdon | Two corries erode back-to-back → knife-edge ridge |
| Drumlin | Vale of Eden, Cumbria; lowland Scotland | Oval mounds of till deposited by moving ice |
| Glacial till (boulder clay) | Much of lowland England | Unsorted sediment deposited as ice melts |
Glaciation explains why the Lake District has deep ribbon lakes (Windermere, Ullswater) — glacially over-deepened valleys later filled with water; and why Scotland has numerous sea lochs (fjords) — glacial troughs flooded by the sea after ice melted.
Common OCR exam mistakes
- Saying granite is "soft" — it is one of the hardest common rocks; it resists erosion and forms uplands.
- Forgetting the scarp-and-vale pattern — hard rock = scarp; soft rock = vale, with the dip slope behind the hard escarpment.
- Confusing glacial and fluvial features — a U-shaped valley is glacial; a V-shaped valley is formed by rivers. Distinguish them clearly.
- Not linking geology to the processes operating — "granite is resistant so the Lake District is upland" scores 1 mark; "granite is resistant and impermeable so water flows over the surface rather than through, increasing erosion rates and maintaining streams that further deepen the glacially-eroded valleys" scores more.
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