Volcanic Geological Feature - Morro Rock

 Volcanic Geological Feature

Morro Rock @ Morro Bay

Morro Rock is a volcanic plug, which formed when magma solidified within the event of an active volcano. Over time, the surrounding softer rock eroded away, leaving the harder volcanic plug exposed. Morro Rock formed approximately 23 million years ago during the Miocene epoch. This formation is part of a series of ancient volcanic plugs in the region known as the "Nine Sisters." 

When Morro Rock was part of an active volcanic system, it likely appeared as a classic volcanic mountain. This would include a central vent from which magma, ash, and volcanic gases would have been emitted. Surrounding the vent would have been various volcanic features such as lava flows, pyroclastic deposits, and possibly a volcanic crater.
The outcrops of Morro Rock show physical characteristics of igneous rock, such as a fine to coarse-grained texture, dark color, visible minerals, and jointing or fractures. The rocks appear to be intrusive because Morro Rock is a volcanic plug, indicating that the magma solidified below the Earth's surface.

Isabella Uhlik
Morro Bay - May 27th, 2024

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