When Did the Light-Toned Layers Form? by BeautifulMars (HiRISE/NASA) published on 2021-09-21T17:45:48Z Determining when the light-toned layered deposits formed is important for understanding the geologic history of Valles Marineris, especially because these deposits are hydrated and most likely formed in the presence of liquid water. Narration: Tre Gibbs https://uahirise.org/ESP_070107_1750 Genre Science