The leading explanation is a familiar sequence for Mars: water first, wind later. Scientists think groundwater once flowed through fractures in bedrock, depositing minerals that hardened those zones. Over long spans of time, wind eroded the surrounding weaker rock, leaving mineral-reinforced ridges behind. According to the rover team\u2019s findings, one long-standing clue involved dark lines seen in orbital images: a 2014 proposal suggested they were central fractures where groundwater once concentrated minerals, and Curiosity has now confirmed those dark lines are fractures.<\/p>\n
The Nodules Are Real, Widespread, and Not Where the Team Expected Them to Be<\/p>\n
The most eye-catching surprise in Curiosity\u2019s close-ups is the nodules, small, bumpy mineral features on and around the ridges. The rover imaged pea-size nodules while exploring the boxwork region on Aug. 21, 2025, and later captured a panorama on Sept. 26, 2025.<\/p>\n
What\u2019s strange is their placement. Mission scientists expected nodules to cluster near the central fractures, but Curiosity found them along ridge walls and down in the hollows between ridges. According to the rover-team: \u201cWe can\u2019t quite explain yet why the nodules appear where they do,\u201d said Tina Seeger<\/a> of Rice University, one of the scientists leading the boxwork investigation. She added a working idea, \u201cMaybe the ridges were cemented by minerals first, and later episodes of groundwater left nodules around them\u201d, while also signaling that it\u2019s not settled.<\/p>\n Live Science described the nodules as \u201cegg-like spheroids\u201d and stressed that researchers are struggling to explain them, while also noting there is \u201cno suggestion\u201d they are directly tied to life. The point that survives across the sources is simpler and more careful: the nodules strengthen the case for groundwater involvement, but their distribution hints at more than one episode of groundwater activity, rather than a single, clean event.<\/p>\n Chemistry from Drilled Samples Adds Clay, Carbonates, and a Targeted Search for Organics<\/p>\n![\"Researchers](\"https:\/\/www.newsbeep.com\/uk\/wp-content\/uploads\/2026\/03\/researchers-think-these-boxwork-ridges-were-created-by-ancient-groundwater-as-captured-in-a-dec-10-2.jpeg\")
Researchers think these boxwork ridges were created by ancient groundwater, as captured in a Dec. 10, 2006 image taken by NASA\u2019s Mars Reconnaissance Orbiter. \u00a9NASA\/JPL-Caltech\/University of Arizona.<\/p>\n