|
|
|
|
|
|
|
|
|
|
|
|
Geological karst pipes |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Syncline |
thrust |
|
|