Volcanic Neck Landscape
This is a type of volcanic landscape that forms when a volcanic conduit is filled with lava or pyroclastic rocks to create a volcanic neck or rock neck. Geological features that characterise volcanic necks are: (1) Volcanic necks are usually circular in map view. Most tabular conduits are filled with tuff, but some are filled with lava or lava breccia. Vertical or steeply inclined conical conduits are often filled with lava and seldom with both lava and pyroclastic rocks. Linear conduits are often filled with lava, breccia or tuff. (2) Volcanic necks can form positive or negative topography depending on the degree of rock resistance. Volcanic necks composed of acidic lava always form positive topography and form steep high peaks.