“Slushball” Earth: New Evidence Rewrites Ice Age History — Geologists have uncovered ev |
New evidence suggests that the Marinoan Ice Age, one of the most severe ice ages in Earth’s history, may not have entirely frozen the planet as previously thought. Instead, it was more of a “Slushball Earth,” with patches of open water supporting life in the shallow mid-latitude seas. The finding, published in, is based on geological samples and ancient algae from over 600 million years ago.
The Marinoan Ice Age is regarded by scientists as one of the most severe in Earth’s history, leading to the formation of glacial ice that persisted for a staggering period of 15 million years. Researchers found evidence that Earth was not completely frozen solid during the Marinoan ice age 635 million years ago. Shallow, mid-latitude seas remained ice free, perhaps helping life persist. Credit: Michael MillerScientists found benthic phototrophic macroalgae in black shale dating back more than 600 million years.
“We present a new Snowball Earth model in which open waters existed in both low- and mid-latitude oceans,” Song said. University of Cincinnati Geology Professor Thomas Algeo examines rock cores in his lab. Credit: Andrew Higley
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