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Stop 2: Glorieta-San Andres Contact

Examine evidence of change from sandy dunes to shallow sea.

Stop 2: Glorieta-San Andres Contact

Layers of Glorieta and San Andres rock touching.

The contact between Glorieta Sandstone and overlying limestone of the San Andres Formation is exposed here. This records the change from land (sandstone) to sea (limestone) during the Permian, about 270 Ma.

Artist's representation of a yellow sand dune field next to the ocean with two giant lizard-like reptiles on the sand.

Artist's representation of the seafloor during the Permian with large ammonites swimming in the blue water, and light cream sand with a couple plants on the seafloor.