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Lucy Webb

@lucywebb.bsky.social

PhD Candidate in Earth & Planetary Sciences at Stanford. I study sedimentary rocks and geochemistry to understand the evolution of life & environments on Earth.

Posts Replies Media

Reposted by Lucy Webb

Proceedings of the National Academy of Sciences @pnas.org · 03/08/2026

Why did some marine animals survive the Great Dying while others vanished? A new PNAS study suggests warming oceans and declining oxygen levels shaped survival after Earth’s largest mass extinction. In The Debrief: ow.ly/UupS50ZvQ2Q In PNAS: ow.ly/qeAK50ZvPRE

Seven different fossils and seashells arranged side by side for inspection.
Image credit: Sarah Leibovitz

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Reposted by Lucy Webb

Barack Obama @barackobama.bsky.social · 12/02/2026

Today, the Trump administration repealed the endangerment finding: the ruling that served as the basis for limits on tailpipe emissions and power plant rules. Without it, we’ll be less safe, less healthy and less able to fight climate change—all so the fossil fuel industry can make even more money.

pbs.org

WATCH: Trump, EPA's Zeldin announce end of scientific basis for U.S. action on climate change

The Trump administration on Thursday revoked a scientific finding that long has been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate change, the most aggressiv...

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Reposted by Lucy Webb

The Geological Society of America (GSA) @geosociety.bsky.social · 17/01/2026

Bivalves usurped brachiopods as the dominant benthic filter-feeders—the reasons why have been debated. new #Geology paper by Kemi Ashing-Giwa and colleagues support the hypothesis that sulfide played a significant role in the extinction’s selectivity. Read article: geosociety.co/Ashing-Giwa_et_al

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Lucy Webb @lucywebb.bsky.social · 05/01/2026

Were Earth's deep oceans better oxygenated during the Tonian than later in the Neoproterozoic? New thallium isotope data suggest they were. Check out our new paper in Geology: doi.org/10.1130/G536...

doi.org

Thallium isotopic evidence for the Tonian rise and Cryogenian fall of Neoproterozoic oxygen levels | Geology | GeoScienceWorld

Estimating dissolved oxygen (O2) concentrations in seawater during the Neoproterozoic is central to testing hypotheses about the role of O2 in animal

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