1 / 7

How to recognise an esker

How to recognise an esker. North of Blairgowrie close to the Highland Boundary Fault. NGR : NO156506 Direction of view : NW. A 93 Blairgowrie to Braemar road. Look for the clues!. Too low for the OS map to pick it out. Long, low, winding ridge. Exposed face might reveal more.

gavin-valentine
Download Presentation

How to recognise an esker

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. How to recognise an esker North of Blairgowrie close to the Highland Boundary Fault NGR : NO156506 Direction of view : NW A 93 Blairgowrie to Braemar road

  2. Look for the clues! Too low for the OS map to pick it out Long, low, winding ridge Exposed face might reveal more Vegetation contrast

  3. More clues… and questions Man-made or natural? Sediments – not rock Arch shaped in cross section We need a closer look!

  4. Look at the sediments Are the sediments sorted? Fine sediments Coarse sediments Now check elsewhere on the free face

  5. Some more good evidence Coarse Fine Coarse Very coarse Fine Rounded stones Sorted layers of sediment

  6. Put the clues together • Low winding ridge in the landscape • In an area that once was ice covered • Vegetation changes • Arch shaped cross section • Sorted sediments (so not man made or direct deposition by ice) • Rounded sediments (water worn) • Fluvioglacial in origin

  7. …and what have you got? An esker!

More Related