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Terrestrial Field Trips

Upper panel: Large and inset photos of iron oxide concretions ("blueberries") on Mars are Meridiani Planum Lower panel: Large and inset photos of iron oxide concretions in Jurassic Navajo Sandstone, Utah.

Upper panel: Large and inset photos of iron oxide concretions ("blueberries") on Mars are Meridiani Planum (Credit: JPL/NASA).
Lower panel: Large and inset photos of iron oxide concretions in Jurassic Navajo Sandstone, Utah. (Credit: Marjorie Chan, University of Utah.)