HiRISE: High Resolution Imaging Science Experiment http://uahirise.org Image updates from the HiRISE camera onboard the Mars Reconnaissance Orbiter (MRO/NASA) en-us editor@uahirise.org (Ari) Wed, 4 May 2016 10:30:00 MST Troughs in Elysium Fossaehttp://uahirise.org/ESP_044884_2050The two linear depressions in this image form part of the Elysium Fossae complex, a group of troughs located in the Elysium quadrangle of Mars. Possible Sulfate Deposits in West Melas Chasmahttp://uahirise.org/ESP_044892_1695In this region, hydrated sulfate salts have been detected, and are found extensively throughout the Valles Marineris canyon system.Southern Winter Frost Accumulationshttp://uahirise.org/ESP_044909_1450With this image taken during mid-winter in the Southern hemisphere, we can observe accumulating frost on pole-facing slopes.A One-Kilometer Crater on the Floor of Saheki Craterhttp://uahirise.org/ESP_044913_1580 Much of the material has been eroded over time and has slumped downwards towards the crater floor, leaving behind chalk-like streaks of color. HiClips: 4 May 2016 http://www.uahirise.org/media/ Narrated videos for our captioned image release.