Major climate and environmental changes of earlier geological periods, such as the Paleocene-Eocene thermal maximum, the Azolla event, the Messinian salinity crisis and the Carboniferous rainforest collapse. An event belongs here when its cited article describes a climate event millions of years old. It excludes events of the last twelve thousand years. They are reconstructed from isotopes, fossils and sediments and show how the planet responded to large changes in carbon and ocean circulation.
Deep-Time Climate Events
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Paleocene-Eocene thermal maximum (Wikipedia)
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The Paleocene-Eocene thermal maximum (PETM), alternatively Eocene thermal maximum 1 (ETM1) and formerly known as the Initial Eocene or Late Paleocene thermal maximum, was a geologically brief time interval characterized by a 5-8 °C (9-14 °F) global average temperature rise and massive input of carbon into the ocean
Azolla event (Wikipedia)
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The Azolla event is a paleoclimatology scenario hypothesized to have occurred in the middle Eocene epoch, around 49 million years ago, when blooms of the carbon-fixing freshwater fern Azolla are thought to have happened in the Arctic Ocean.
Messinian salinity crisis (Wikipedia)
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The Messinian salinity crisis (also referred to as the Messinian event, and in its latest stage as the Lago Mare event) was an event in which the Mediterranean Sea dried up, in a cycle of partial or nearly complete desiccation throughout the latter part of the Messinian age of the Miocene epoch, from 5.96 to 5.33 Ma
Carboniferous rainforest collapse (Wikipedia)
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The Carboniferous rainforest collapse (CRC) was a minor extinction event that occurred around 305 million years ago in the Carboniferous period.
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