This year, the Museu Nacional celebrated its 200th year. I am hopeful all is not lost.
Lapa Vermelha IV Hominid 1, informally referred to as Luzia, was discovered in 1975 in a rock shelter locality near Belo Horizonte, Brazil, by a French and Brazilian team led by Annette Laming-Emperaire. At the time, Laming-Emperaire felt that this was among the oldest human remains found in South America.
The Paleocene-Eocene boundary is marked by a period of rapid global warming and co-occuring changes in mammals in response to the warming, including the appearance of seemingly dwarfed species and the rise of important mammal groups like the hoofed mammals and primates. The authors here use fossilized pollen from rocks known to bracket the Paleocene-Eocene boundary and discuss the changes in plants during this important episode of climate change.Continue reading “Plants and Animals Don’t Respond to Climate Change the Same Way – #365papers – 2018 – 54”
Much of this paper is a description of a new species of early primate, along with a description of the primate fauna from South Pass, Wyoming, which is on the edge of the Green River Basin. This particular fauna is important because it is on the edge of a geographical basin, so it includes a mixture of animals that prefer flat plains and those that prefer upland areas.Continue reading “The Value of Fossils from the Margins of Basins – #365papers – 2018 – 53”
This paper contains a discussion of the mammalian paleontology at Fossil Butte National Monument, Wyoming. The authors examined and identified at least 46 species of fossil mammals from 29 localities within rocks of the Wasatch Formation at Fossil Butte. Using techniques of stratigraphy, the authors correlated all the localities in order from oldest to youngest. Further, they used the species present and clues from the rocks themselves to interpret the ancient environment in which the mammals lived.Continue reading “Fossil Mammals and the Rocks that Contain them at Fossil Butte, Wyoming – #UREES270 – 2018”
Some late Cretaceous-aged (AKA Maastrichtian) rocks from Romania contain fossilized soils (paleosols), dinosaur bones and teeth, and dinosaur eggshells. The authors use geochemical analysis, specifically stable isotope analysis, from all of these materials to build a fairly complete picture of what the region was like at the time that those dinosaurs were alive. What they found was that the environment was relatively warm and dry, and that the dinosaurs didn’t appear to utilize different parts of the habitat, but instead lived side-by-side.Continue reading “Interpreting Cretaceous Environments from Multiple Sources – #365papers – 2018 – 32”
Sabertoothed mammals are so named because of their massive, elongate canines. A natural question to ask is, how does it get so long? The major ideas are that the teeth grow for a very long time (which would affect how the animals survived before the teeth were fully grown), that they grew very quickly, or some combination.