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| GLOSSARY | > basalt, lava, malpais, weathering |
Malapai Hill
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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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Malapai Hill |
| JOSHUA TREE > | ABOUT THE PARK | TRAILS & BACKROADS | MOJAVE ECO-ZONE | COLORADO ECO-ZONE | AERIAL PHOTOS | 360° PHOTOS |
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