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news Earth Evidence status: Peer reviewed · Rock-record dating study

End-Permian extinction hit North China’s land and sea in step, study says

River rocks date North China's end-Permian carbon upheaval to 252.1–252.0 Ma, in step with the marine die-off, but each age has a 220,000-year uncertainty.

What it does not show No dated ash at Sigou: ages come from orbital rock cycles anchored by magnetic correlation to a marine section, each ±0.22 million years; main text paywalled (abstract, SI and data…

By Murad Ali Khan 10 min read
Diagram placing lab-grown Asgard archaea strains HC1 and SC1 beside eukaryotes on the family tree, and comparing a simple HC1 cell with protrusions to a eukaryotic cell with nucleus and mitochondria

news Biology Evidence status: Peer reviewed · Laboratory cultures and genome analysis

Lab-grown Asgard archaea closest to eukaryotes are simple inside

Two newly cultured Heimdallarchaeia, the closest known archaeal relatives of eukaryotes, lack internal membranes. What that means for how complex cells began.

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