Considering a supernova as the possible cause of the End Devonian Extinction.
[sciencythoughts.blogspot.com]
The Late Devonian biodiversity crisis is characterized by a protracted decline in speciation rate occurring over millions of years, punctuated by an extinction pulse (Kellwasser event) followed about 10 million years later by a more moderate extinction (Hangenberg event) around the Devonian/Carboniferous Boundary, about 359 million years ago. It has recently been suggested that the Hangenberg event was associated with ozone depletion, in light of evidence such as malformations persisting in palynological assemblages on the order of many thousands of years. It has been argued that volcanic eruption and a large igneous province triggered ozone depletion, whereas other research has instead linked it to an episode of global warming not caused by a large igneous province.
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Posted by JoeBKite-like structures in the western Sahara Desert.
Posted by TriphidAn Aussie Indigenous Message Stick.
Posted by TriphidIndigenous Australian Aboriginal Rock art dated somewhere between 20 and 30 thousand years old.
Posted by TriphidIndigenous Australian Aboriginal Rock art dated somewhere between 20 and 30 thousand years old.
Posted by TriphidIndigenous Australian Aboriginal Rock art dated somewhere between 20 and 30 thousand years old.
Posted by TriphidIndigenous Australian Aboriginal Rock art dated somewhere between 20 and 30 thousand years old.
Posted by JoeBDortoka vremiri: A new species of Dortokid Turtle from the Late Cretaceous of the Hațeg Basin, Romania.
Posted by JoeBThe Cabeço da Amoreira burial: An Early Modern Era West African buried in a Mesolithic shell midden in Portugal.
Posted by JoeBMusivavis amabilis: A new species of Enantiornithine Bird from the Early Cretaceous Jehol Biota of northeastern China.
Posted by JoeBTorosaurus in Canada.
Posted by JoeBStone tools from the Borselan Rock Shelter, in the Binalud Mountains of northeastern Iran.
Posted by JoeBDating the Lantian Biota.
Posted by JoeBBashanosaurus primitivus: A new species of Stegosaur from the Middle Jurassic of Chongqing Municipality, China.
Posted by JoeBDetermining the time of year when the Chicxulub Impactor fell.
Posted by JoeBSão Tomé and Príncipe: Possibly the last country on Earth never to have been visited by a working archaeologist.
Posted by JoeBMambawakale ruhuhu: A new species of Pseudosuchian Archosaur from the Middle Triassic Manda Beds of Tanzania.