I assume it was lined because of the small amount of rock above. This likely explains the collapse seeing as the lining gives way to rock at the point of the fall. The position of the fall can be seen in the field above.
Copy & Paste Forum Code
To display this photograph in a forum message please copy the text below and paste it into your forum message:
[photo]88104[/photo]
To display this photograph in a forum message and link to the full size image please copy the text below and paste it into your forum message:
[link]88104[linkphoto]88104[/linkphoto][/link]