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Joshua Tree National Park -
Mojave Ecozone: Geology Tour Road: Squaw Tank Dikes/IntrusionsThe light-colored bands of rock cutting across the monzogranite were formed when molten magma pushed through joints in the rock. Being of a harder material (aplite or pegmatite), dikes as they are called, are more resistant to erosion and weathering, and tend to protrude above the bedrock as low walls.PREVIOUS - NEXT
 Dike in Monzogranite |
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These items are historical in scope and are intended for educational purposes only; they are not meant as an aid for travel planning. Copyright ©Walter Feller. 1995-2023 - All rights reserved. |