The Glen Roy Area Through Time
| Present day to 1,500 years ago. Increased land improvements and forest
clearance. Enhanced slope erosion and gully
6,000 years ago. Start of significant woodland clearance by human activity.
10,000 years ago. Establishment of woodland.
11,500 years ago. Climate warms very rapidly. Glaciers melt and ice-dammed lakes in Glen Roy, Glen Gloy and Spean drain
for the last time. Landslides and rockfalls occur due to stress release and ground thawing.
12,500 years ago. Climate becomes extremely cold again at the start of Loch Lomond Stadial. An icefield forms in the
West Highlands. Glaciers from this icefield block the drainage in Glen Roy, Glen Goy and Glean Spean, allowing formation of
ice-dammed lakes and the Parallel Roads.
14,700 years ago. Climate warms rapidly, with summer temperatures comparable to those of today. Glaciers retreat
22,000 years ago. A vast sheet of ice covers all but a few mountain tops and extends at least 100km west of the Scottish
29,000 years ago. Climate cools and the last major ice sheet glaciation (Late Devensian) begins.
2.4 million to 29,000 years ago. Many glacial episodes with short warmer (interglacial) intervals. Erosion by ice sheets
and mountain glaciers.
2.4 to 24 million years
|Tropical conditions are widespread, although the climate cools as the Ice Age approaches.|
24 to 65 million years
|The North Atlantic Ocean continues to widen. Active volcanoes on Skye, Mull and Rum pour out great volumes of lava.|
65 to 142 million years
| Sea levels are higher than today. Warm, shallow, temperate seas fringe
the low-lying land, with chalk deposited across
Scotland, but later removed by erosion.
142 to 206 million years
|Opening of the North Atlantic Ocean begins. Climate is warm and humid. Sea levels are considerably higher than today.|
206 to 248 million years
|Scotland is located in near-equatorial latitudes, in a similar position
to sub-Saharan Africa today, and desert conditions are
248 to 290 million years
|Desert conditions prevail across Scotland. Violent earthquakes rock the land.|
290 to 354 million years
|Scotland sits astride the equator.|
354 to 417 million years
|The high mountains created by the colliding continents are rapidly
eroded and debris carried to lower ground by streams
and rivers. Movements on the Great Glen Fault produce a zone of broken rock. The Ben Nevis volcano is active!
417 to 443 million years
|The earth continues to move as Scotland collides with Baltica (Norway
and Sweden) and Avalonia (England). A mountain
chain (the Caledonian Mountain Belt) as high as the Himalayas is created as a result of these collisions.
443 to 490 million years
|The ancient sands and muds, laid down in Precambrian times, are cooked
and squashed as they become deeply buried
within the earth’s crust.
||Scotland moves north from a position close to the South Pole!|
545 to 3,500 million years
|Great thicknesses of sands and muds are deposited. These are later altered to form the bedrock of the Glen Roy area.|