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Pyramid Rock
Accessible only by a boat or hazardous swim, Pyramid Rock is a remnant of a lava flow resting on a basement of Woolamai Granite. At low tide there is an extensive area of granite exposed, the largest outcrop of this material outside Cape Woolamai. The basalt is surrounded by an apron of coarse scree and gravel beaches, the dark colour of this material contrasting with the lighter coloured granite. This is one of the few locations on Phillip Island where the lava flows are absent or very thin and represents a high point on the pre-volcanic land surface.
This is the best exposure of the base of the older volcanics on Phillip Island and a major example of the contact between the volcanics and the pre-volcanic land surface. The presence of inter-volcanic gravels indicates the Woolamai Granite was probably never completely covered by lava flows.
Pyramid Rock
Accessible only by a boat or hazardous swim, Pyramid Rock is a remnant of a lava flow resting on a basement of Woolamai Granite. At low tide there is an extensive area of granite exposed, the largest outcrop of this material outside Cape Woolamai. The basalt is surrounded by an apron of coarse scree and gravel beaches, the dark colour of this material contrasting with the lighter coloured granite. This is one of the few locations on Phillip Island where the lava flows are absent or very thin and represents a high point on the pre-volcanic land surface.
This is the best exposure of the base of the older volcanics on Phillip Island and a major example of the contact between the volcanics and the pre-volcanic land surface. The presence of inter-volcanic gravels indicates the Woolamai Granite was probably never completely covered by lava flows.