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For example, you can easily see areas where there are vadose canyons or phreatic tubes.
Continuing straight on for 30 meters leads to an 8 meter deep vadose trench in the floor.
Downstream from the junction, the passage becomes less obviously vadose.
A more or less complete dead phreatic streamway is now known to exist, paralleling the present vadose streamway.
Ignoring the initial holes in the floor, the route became a familiar winding vadose passage to the head of the pitch.