Mars Phoenix storm

Volcanic Deposit Responsible For Martian Dust

The formation, which sits in the highland-lowland boundary near the Tharsis and Elysium volcanic areas, was once one-half the size of the United States. However, the Martian winds blowing through the surface of the planet have eroded the Medusae Fossae to around 20 percent. Even then, the formation is still the largest volcanic deposit known to man in the solar system.

https://www.techtimes.com/articles/232649/20180725/martian-dust-can-cover-planet-up-to-39-feet-deep-and-scientists-now-know-where-it-s-coming-from.htm

https://syncspot.blogspot.ca/2018/04/mars-phoenix-storm-2014-2018.html

InSight’s Landing Site: Elysium Planitia

Its landing site, Elysium Planitia, was picked from 22 candidates, and is centered at about 4.5 degrees north latitude and 135.9 degrees east longitude; about 373 miles (600 kilometers) from Curiosity’s landing site, Gale Crater. The locations of other Mars landers and rovers are labeled.

https://www.independent.co.uk/news/science/mars-rover-opportunity-nasa-dust-storm-clear-recovery-deadline-a8518281.html
https://www.space.com/41698-mars-rover-opportunity-dust-storm-support.html
https://www.space.com/41702-mars-rover-opportunity-recovery-deadline.html
https://www.space.com/39776-mars-dust-burying-phoenix-lander-photos.html