|volcanic pipe |
A vertical conduit below a volcano through which magma has passed and that has become filled with solidified magma, volcanic breccia, and fragments of older rock.
A shelter had been erected on one side of the volcanic pipe.
By unanimous consent, the last station at the volcanic pipe had been omitted.
Evidently Guevara had put a ring of men around the volcanic pipe and planned to hold it by force of arms.
There was intermittent fighting around the volcanic pipe, the police reported.
At Ruby Hill near Bingara they were found in a breccia filling a volcanic pipe.