Earthwatcher's photos with the keyword: Arbroath

Originally posted for the Guesswhere UK group. The Keptie Hills in Arbroath is a good example of an esker. Eskers are formed from rock debris deposited by meltwater in a sub-glacial meltwater tunnel. The confines of the glacier ice means that the deposits are closely constrained and tend to build upwards rather than spreading out. When the glacier finally melts away, the esker is left as a sinuous ridge of gravel and sand. They often superficially resemble railway embankents and can be many miles long. Scanned from Kodachrome 64 transparency film, taken with a Zenit 'E'. See where this picture was taken. [?] -------------------- Here's a photo of a sub-glacial tunnel on Mt Ranier in Washington, USA, taken by Flickr member Tom. www.flickr.com/photos/lazybeagle/409343860/ You can see the debris in the tunnel floor which may eventually become an esker.

Uploaded as a clue to another GWUK photo These cliffs are of 'Old Red Sandstone'. There are two units in the cliff - the upper, coarse, pebbly sandstone is of Upper Devonian age, and rests unconformably on finer-grained sandstone of Lower Devonian age. The Middle Devonian is missing and is represented by the irregular junction (an angular unconformity) between the two units. The Lower Devonian sandstone was deposited first, then uplifted, tilted and eroded during the Middle Devonian, before the upper unit was deposited in the Upper Devonian times. Scanned from Kodachrome 64 transparency film, taken with a Zenit 'E'. See where this picture was taken. [?]