At http://tallbloke.wordpress.com/2013/08/09/newly-discovered-asteroid-2013... ... astronomers expected one space rock to come by but they got a second one, tracking the first asteroid. The first one passed by at a safe distance and was not a problem. The chaser came much closer - well inside the Moon's orbit.
Han Kloosterman, who has been researching what he calls the Ussello Horizon for too many years to count, has a problem. The Ussello Horizon is a European geological layer separating the Alleroid warm period from the cooler Younger Dyras event, and he has worked tirelessly on this, even looking for UK examples of the thin black layer of organic material (corresponding, it is thought, with the Black Mat deposits in N America).
At http://phys.org/print295014415.html ... there is a nice graph here to start the ball rolling, using five cores that show, with the aid of a blue band as highlight, the drop in temperature during the Younger Dryas (from Greenland, the tropics, and Antarctica). The graph purports to show a warming in Antarctica (Camp Century core) and this sticks out like a sore thumb, being slightly skew whiff from the other cores.
Catching up ... the end of Permian extinction is now being blamed on a comet or asteroid strike, 252 million years ago (see http://phys.org/print294567573.html). The Araguainha crater in Bazil is where it is supposed to have left its mark - seel also www.sciencedirect.com/science/article/pii/S0016703712001457
At http://anthropology.net/2013/07/26/the-role-of-climate-on-african-stone-... .... the blog author refers to a paper in the May 2013 issue of Nature Communications, 'Devolopment of middle stone age innovation linked to rapid climate change' where we learn the bigger blink of the eye (the last Ice Age, all 90,000 years) was punctuated by smaller winks of the eye (ups and down in temperature during that 90,000 years).
Another new paper on the Younger Dryas boundary event - by Andrew Overholt and Adrian Melott. They are thinking in terms of increased levels of C14 and Bryllium 10 at the boundary are actually evidence of an extraterrestrial object entering the Earth's atmosphere - and breaking up. In other words, the meme has definitely shifted from a comet impact to an airburst - see http://cosmictusk.com/melot/
Harvard scientists are now involved in the Younger Dryas Boundary Event controversy. A PNAS paper has reopened the case in a dramatic fashion and George Howard adds a touch of sarcastic humour with a spoof - see http://cosmictusk.com/petaev_platinum_harvard_younger_dryas_impact_aster... and http://cosmictusk.com/paetev_harvard_platinumyounger_dryas_comet_clovis_...
Excellent post by Hossein Turner at http://hozturner.blogspot.co.uk/2013/07/the-great-comet.html ... a fresh insight into the Great Comets of the Ancient World, inspired no doubt by comet ISON and its appearance later in the year. Comets are common on rock art - but not always recognised as such. However, the fact that many petroglyphs have features in common with Chinese comets as illustrated on the Silk Manuscripts (drawn up between 200BC and 9AD) may serve to shed some new light on the origin and meaning of some of the etchings on rock faces.
At http://tallbloke.wordpress.com/2013/07/01/2013-chelyabinsk-meteor-larges... ... the 2013 Russian meteor, or fireball, is the largest ever recorded by CTBTO seismic monitoring (infrasound sensors) and a paper on the subject is now available. It raises some interesting questions. If there had been a lot of meteors in the past how would scientists know that they had occurred?
At http://phys.org/print291614362.html ... this is all part of CAGW hype so may be complete waffle without much substance - but interesting in the context of the last Ice Age and how it all hangs together with a dollop of circular reasoning as far as sea levels and ice sheets are concerned. The paper is published in Nature Geoscience and looked at fossilised coral in the Caribbean - which is purported to tell us about historical rises in sea levels.