[1] The formation preserves fossils dating back to the Middle to Late Miocene (Barstovian and Clarendonian in NALMA classification).

[2] Mint Canyon is a fluvial landform in the Sierra Pelona range.

[4] The Mint Canyon Formation consists primarily of fluvial, alluvial, and lacustrine conglomerates, sandstones, and mudstones.

[6] The contact between the Mint Canyon and Castaic Formations is an angular unconformity in some places, and it is apparently conformable and gradational in others.

[5] The formation preserves vertebrate fossils dating back to the Middle Miocene subperiod of the Neogene period:[2]