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Geology Tour Road:

Stop #7

Malapai Hill


Malapai Hill

The twin peaks of Malapai Hill rise about 400 feet above the valley floor. The black basalt that composes the hill is harder and more resistant to weathering than monzogranite. As the basalt intruded the monzogranite, it may or may not have reached the surface. If it did reach the surface, any cinder cone of lava flow it may have produced has long since eroded and disappeared. This intrusion may have happened at two or three million years ago; which is quite recent when compared to the age of monzogranite at 85 million years, and gneiss at 1.7 billion years.

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GLOSSARY > basalt, lava, malpais, weathering

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Disclaimer: Some portions of this project were developed with assistance from AI tools to help reconstruct historical contexts and fill informational gaps. All materials have been reviewed and fact-checked to ensure accuracy and reliability, though complete precision cannot be guaranteed. The aim is to provide dependable starting points and distinctive perspectives for further study, exploration, and research.

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