Amborella Day

The Triassic ends 201 million years ago with another major mass extinction (the fourth, after the end-Ordovician, end-Devonian, and end-Permian). Not quite as bad as the end-Permian, (“only” 75% of species go extinct). This coincides with the formation of the Central Atlantic LIP (Large Igneous Province), which now includes a lot of eastern North America, northeast Amazonia, and western North Africa. So the end Triassic mass extinction may be the result of volcanoes spewing lava and carbon dioxide as Pangaea splits into Laurasia (North America, most of Eurasia) and Gondwanaland (South America, Africa, Antarctica, India, Australia).

The succeeding Jurassic Period will be when dinosaurs become the dominant vertebrates on land. The mammals around are mostly shrew-sized and nocturnal.

Not as conspicuous is another evolutionary innovation: the ancestors of Amborella, a rare shrub found in the wild only on New Caledonia, split off from the other angiosperms, ancestors of all other flowering plants, 200 million years ago. (This was suspected for a while, and confirmed in 2012 with the sequencing of the Amborella genome.) We can call this the origin of flowers. Amborella has clusters of small white flowers, male and female separate.

amborella

People expect to get flowers on Mother’s Day and Valentine’s Day, but not on March 16, 207-196 million years ago on Logarithmic History. So surprise someone with flowers for Amborella Day!

 

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2 thoughts on “Amborella Day

  1. Pingback: Australian Megafauna and the Sixth Great Extinction | Logarithmic History

  2. Pingback: Jomon | Logarithmic History

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