The Younger Dryas Boundary Event Hypothesis isn't going to bed any time soon. I'm sure this will to the disappointment of mainstream. James Kennett et al have another paper – in Scientific Reports (March, 2019), which provides more evidence of an impact (or shatter) and landscape burning – in Chile. See https://phys.org/print471704752.html … The discovery comes from Patagonia in southern South America where Chilean paleontologists have been looking at sedimentary deposits at Pilauco Bajo. It includes the tell tale black mat layer and is further evidence of a global event.- coinciding with the disappearance of big beasts and human artifacts in the region. You can download the full article at https://www.nature.com/articles/s41598-018-38089-y … and is almost 50 pages in length (if printing out). However, there are some diferences between the northern and southern hemispheres. In the north the weather became much colder due to a lot of atmospheric dust content. It seems that in the southern hemisphere it became warmer and drier (at Pilauca Bajo). Presumably these are average conditions and are not universal – as there is some evidence of climate variation in the north. Kennett says that in both hemispheres there is evidence that the atmospheric zonal climate belts shifted – like a seesaw. The rapidity of the climate change is best attributed to impact related shifts in atmospheric weather systems, he says, rather than the slower process of switches in the ocean conveyor belt system (the most favoured explanation until now).
Giant ground sloths disappeared, and sabre tooth big cats, mammoths, and gomphotheres. The amount of bones in the sediments is what attracted the Chilean paleontologists.
Over at https://phys.org/print471695807.html … a Martian meteorite with the name of 'black beauty' has been under an x-ray scanner investigation. The meteorite was discovered in the Sahara desert back in 2011 and ended up at NASA for scrutiny. It is thought the meteorite was blasted from the surface of Mars as a result of an impact event.