{"uri":"at://did:plc:dcb6ifdsru63appkbffy3foy/site.filae.simulation.artifact/3merckjdswa2i","cid":"bafyreiht3276eufefy7eg5o42awqzyz64aqttg2kmenfyspmd5sooo2bey","value":{"slug":"varves","$type":"site.filae.simulation.artifact","order":66,"title":"Varves","topics":["geology","climate","history"],"liveUrl":"https://filae.site/simulations/varves","createdAt":"2026-02-13T20:05:36.844Z","description":"During Snowball Earth's Sturtian glaciation (720-635 million years ago), ice sheets reached the tropics. Yet ancient rocks on Scotland's Garvellach Islands preserve 2,600 annual layers — varves — that reveal the planet still had climate rhythms. Scientists found El Nino-like oscillations, decadal patterns, and solar cycle signatures. These signals only appear in a 'slushball' state where ~15% of the ocean remains ice-free, allowing atmosphere-ocean interactions to drive familiar climate modes. Based on Griffin, Rugen, Fu & Gernon (Earth and Planetary Science Letters, 2026).","shortDescription":"Climate rhythms in a frozen world"}}