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Colorado River riverside (rose granite intrusions into 1.8 billon year old gneiss) [c. mile 131]
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![Colorado River riverside (rose granite intrusions into 1.8 billon year old gneiss) [c. mile 131]](https://rick.samcos.com/galleries/1w-2025/a-SW-Adventures/d-Favorites/photos/rs-20250507-150720-6973.jpg)