In addition most tunnel valleys run from north to south.

Each of these have also been referred to as tunnel valleys.

Tunnel valleys formed during four of the five have been identified.

Evidence suggests that erosion in a tunnel valley is primarily the result of water flow.

The lake was formed by filling a glacial tunnel valley.

As a consequence of this jökulhlaup a tunnel valley is formed.

The tunnel valley is what remains of it in the underlying rock when the ice sheet has melted.

Tunnel valleys frequently include relatively straight individual segments parallel to and independent of one another.

Glacially formed tunnel valleys have been identified on every continent.

On the simplest level, the tunnel valley can be considered a larger-scale version of these phenomena.

The filled tunnel valley are several kilometers long and several hundred meters wide.

This kept it free of sediment, unlike most of the tunnel valleys.

Tunnel valley channels often start or stop abruptly.

The active formation of tunnel valleys is observed in the present period beneath the Antarctic ice.

Tunnel valleys have similar characteristics, irrespective of whether they are formed on land or in a submerged environment.

The subglacial tunnel valley networks originally formed near the ice margin.

In between them lie the tunnel valley lakes and kettle lakes.

When the tunnel valley was free of ice and seawater, it was occupied by the river.

It is believed that snake coils are formed through the same mechanism as tunnel valleys.

Tunnel valleys, by contrast, are not commonly found in Northern Central Europe.

Tunnel valleys frequently run along roughly parallel courses.

Tunnel valleys fill in two main ways.

Urstromtäler should not be confused with tunnel valleys.

Tunnel valleys from successive glaciations may crosscut one another.

Tunnel valleys represent a substantial fraction of all melt-water drainage from glaciers.