- Perseverance Home
- Science
- News and Features
- Multimedia
- Mars Missions
- Mars Home

Written by Margaret Deahn, Ph.D. candidate at Purdue University
Oct. 19, 2026
Once upon a time, NASA's Mars 2020 rover investigated the southern border of "Idubi," an outcrop composed primarily of an igneous mineral geologists call olivine. The rover's "eyes" captured a very exciting geologic feature during its traverse - a contact between distinct rock types that could tell a story about the history of this region. This contact is clearly observed at a target named "Tinga."
At "Tinga," there are distinct geologic units in close contact with one another. The lowermost unit is likely a polymict (made of many types of rocks) breccia (made of angular clasts). Breccia is generally formed by violent geologic processes such as an impact event - this breccia may have been formed by an impact similar to the one that created Jezero crater - or even Jezero itself! See a recent rover blog post