Relating to or denoting rock that has been extruded at the earth’s surface as lava or other volcanic deposits.
More example sentences
- In practice pyroclastic and volcaniclastic rocks include all the products of extrusive volcanic activity except lava flows.
- The northern margin of the melange is marked by a thrust contact with both the Carboniferous sedimentary rocks and extrusive volcanic sequence.
- Although there are no outcrops of Devonian extrusive volcanic rocks in NW Scotland, they can be found in southern and central Scotland and the Orkney Islands.
Definition of extrusive in:
- The US English dictionary