{
  "id": 16792147,
  "title": "Antarctic rocks reveal a missing chapter of glacier history",
  "url": "https://urgent.news/2026/10/27/antarctic-rocks-reveal-a-missing-chapter-of-glacier-history",
  "topic": "science",
  "section": "Science",
  "published": "2026-10-27T20:30:05.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-10-antarctic-reveal-chapter-glacier-history.html"
  },
  "original_language": "en",
  "account": "Recent geological research in Antarctica has uncovered a critical chapter in the region's glacier history, providing new insights into how Marguerite Bay's glaciers behaved during a pivotal cooling period known as the Neoglacial. For decades, scientists struggled to date the formation of moraines, or rock ridges left behind by retreating glaciers, along the bay's margins. However, a team of researchers has now determined the ages of several of these moraines, shedding light on a crucial gap in the peninsula's glacier record.\n\nThe study focused on three glaciers situated on Horseshoe Island and Calmette Peninsula: Shoesmith, Erinç, and Erol. By analyzing beryllium-10 isotopes produced by cosmic rays on the exposed rock surfaces, the scientists were able to assign dates to these moraines, revealing when they last saw glacial activity. The most definitive finding comes from the Shoesmith Moraine, which was dated to approximately 496 ± 79 years ago, placing its formation during the Little Ice Age, a period of cooling that lasted from around 1300 to 1850 AD.\n\nProfessor Attila Çiner of Istanbul Technical University emphasized the significance of these findings, noting that Marguerite Bay had previously been an unexplored gap in our understanding of recent glacier dynamics in Antarctica. The moraines provide a direct timeline for glacier advances during the Neoglacial, allowing researchers to map out past glacier positions before modern satellite and observational data became available.\n\nThe research also highlights the challenges in reconstructing Antarctica's recent history. For instance, the Erinç Moraine exhibited a wide age range, suggesting multiple phases of glacier activity during the late-Neoglacial period. Similarly, boulders from the Erol Glacier were found to be significantly older than the moraine itself, indicating that rock surfaces can retain older geological signatures even after being buried by ice.\n\nOne intriguing observation is the proximity of these ancient moraines to present-day glacier fronts. In many cases, the inner moraine ridges are only 25 to 50 meters (82 to 164 feet) from the current glacier boundaries, suggesting a degree of stability despite the known warming trends in the region. However, the researchers caution that this does not mean the glaciers are immune to future changes, particularly in the face of ongoing warming and shifts in snowfall patterns.\n\nThe findings from Marguerite Bay are consistent with broader patterns of glacier expansion during the Little Ice Age observed in other parts of the Antarctic Peninsula. Similar moraines have been dated at nearby sites, such as Rothera Point, underscoring the regional significance of these findings. However, the varying ages and locations of these moraines highlight the complexities involved in piecing together Antarctica's recent glacial history.\n\nThe study's authors suggest that the presence of these well-preserved moraines could provide additional clues about the dynamics of past glaciers when more undated moraines and lakes are discovered in the area. Overall, this research contributes a vital piece to the puzzle of how Antarctica's glaciers responded to past climate changes, offering a clearer picture of the region's recent glacial history.",
  "summary": "Antarctica's glaciers were changing long before satellites, weather stations or cameras captured their transformations, and they left behind clues. Along Marguerite Bay on the western Antarctic Peninsula, ridges of rocks and debris mark former glacier margins. For decades, scientists lacked direct evidence about when many of these ridges formed.",
  "key_points": [
    "Three glaciers on Horseshoe Island and Calmette Peninsula had their moraine ages determined.",
    "Shoesmith Moraine dated to 496 ± 79 years ago, during Little Ice Age.",
    "Findings reveal glacier behavior during Neoglacial period in unexplored Antarctic region."
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}