Swilla Glen [SD 694 737]
As we walk into Swilla Glen the channel form of the River Twiss changes dramatically.
Use the cursor to navigate along the channel and use the zoom-in function to look at the bed load in detail.
- Which way is the river flowing?
- What is your evidence for this?
- How fast is the water flowing in comparison with the panorama of River Twiss?
- Suggest reasons for the reduced flow velocity.
- The water here is clear (you can see the bed load) but a rusty brown colour. Give reasons for this.
Focus on the entrance to the gorge at the most northerly section of the panorama. Zoom in on this striking feature.
- Why is there such a drastic change in channel form in this area?
In the eastern river bank Carboniferous rocks are exposed.
- What colour are they?
- What does this suggest about the rock type? [Further clues: these rocks ‘fizz with acid’ and often contain fossils].
Identify the rock bedding planes. These are the ‘lines’ you see in the outcrop.
- Are the rocks dipping upstream or downstream?
- What is the angle of dip?
|Hold down left button and move mouse to control panorama. Clicking on the + or - at the bottom of the movie will zoom in or out|