The Aztec Sandstone is an Early Jurassic geological formation of primarily eolian sand from which fossil pterosaur tracks have been recovered.

[4] The formation is exposed in the Mojave Desert of Arizona, California and Nevada.

The lower resistant sandstone unit (100 metres (330 ft) thick) is tan to off-white in outcrops but pinkish in fresh exposures.

Frosted and pitted quartz grains well-cemented by silica are described by Evans in 1958 and 1971.

The upper and less resistant unit (200m thick) consists of alternating white quartz arenites and red to brown silty sands.