Almo Pluton granite (top half - formed about 28 million years ago) in contact with Green Creek Complex granite (bottom half - about billion years

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Almo Pluton granite (top half - formed about 28 million years ago) in contact with Green Creek Complex granite (bottom half - about billion years old). The white diagonal line is a vein (thin dike) called aplite (a mixture of fine-grained quartz and feldspar).

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Size: 5360px × 3560px
Location: City of Rocks Natiional Reserve, Idaho
Photo credit: © William Mullins / Alamy / Afripics
License: Royalty Free
Model Released: No

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