This location offers a unique opportunity to explore and learn about volcanic activity and erosion processes.
Please send a message or email addressing each of the following questions and tasks based on your observations at GZ and the information supplied in the cache description:
-How can you tell this is a volcanic plug? What features do you recognise?
-What form is the top of the plug?
-What form is the bottom of the plug?
Pulpit Rock is a tall rock located just off Cape Schanck. Pulpit Rock is a geological formation created by volcanic activity over millions of years. The base of the rock is called Devils Desk
A volcanic plug, also known as a volcanic neck or lava neck, is a landform created when magma (lava) hardens within the vent of an active volcano. This magma literally “plugs” the vent. The heat and pressure from below reduce so that the magma inside the volcano's vent cools and solidifies.
When the volcano becomes extinct and the surrounding rock erodes away, the erosion-resistant "plug" is all that is left behind producing a distinctive upstanding landform. Some of these plugs appear as a solid rock, others form distinct columns.
