Some say MSA/Middle Paleolithic hominins used ochre for sun protection, blocking any conclusions about marking or other symbolic uses. I say traditions of processing and using mineral pigments for sun protection are more complex and less universal than cosmetic uses.
Some archaeologists have focused on cosmetic uses of pigments, but it remains much more common to see ochre and other pigments framed in terms of "symbolic marking" or "marking".
Of course, cosmetics are used for symbolic marking, and also other kinds of marking, and much use of cosmetics across cultures is directed toward mimicry, enhancing the visual impact of features, or reducing the visual impact of features, not "symbolic" in a strict sense.
All this is to say that cosmetics engage with the senses and cognition on many levels, and the recurrent archaeological tendency to tie early pigment use to language or "symbolic culture", or to try to debunk cosmetic uses of pigments, is just weird.
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The MH2 #hominin mandible is still being built, fragment by fragment, as pieces are recovered from Malapa and prepared in the lab. The skull of this adult Australopithecus sediba individual may be found within the breccia as well. #paleoanthropology
If you're following this series of illustrations, you may recognize that MH2 is my first repeat, as I earlier featured the MH2 pelvis. The Malapa skeletons are amazing examples of discovery, as each piece emerges from the site, it allows us to test new hypotheses.
Some scientists claimed that the difference between MH1 and MH2 mandibular ramus shape must mean that one is Australopithecus and one Homo. Ritzman and coworkers (2016) examined this, finding them compatible with normal within-species variation. dx.doi.org/10.1016/j.jhev…
So, I've started tracking down the citations in this Magnetodeth paper. It will be a surprise to no one that the papers on genetic bottlenecks do not support the 42,000-year-ago event that the new paper says they do.
For example, the paper claims that thylacines underwent a bottleneck 42,000 years ago, citing Lauren White et al. 2018 doi.org/10.1111/jbi.13… That paper actually says 20,400 years.
In the Australian case, the cited papers note that extinctions had a regional pattern that began by 48,000 years ago, the number 42,000 refers to a particular Bayesian analysis and not actual last appearance dates (which are more dispersed) doi.org/10.1038/s41467…
One way of casting this lack of knowledge is to say maybe there was no "origin", that we are looking backward through a cloudy lens at a gradual mixing process that never had a beginning. This idea comports with what we know about continued Neandertal-African mixing.
Yet with Neandertals we intently focus on mechanism: "How much mixing happened, on how many occasions, and how much did it matter?" Surely this must factor into the way we look at evolution within Middle Pleistocene Africa also. With more data, we will focus on those questions.
Lactase persistence and dairying on the surface seem to be a simple and compelling example of gene-culture coevolution in humans. And yet there are patterns that confound the simplistic story. I appreciate that @Maddy_Bleasdale et al discuss some of those. nature.com/articles/s4146…
Several aspects of lactase persistence genetics are not being covered well by press accounts of this paper. Journalists have gone with a pretty simple "counterintuitive lede", i.e., people were drinking milk before lactase persistence mutations were common.
A look at the great frequency maps in the paper is enough to remind folks of the reality that most lactase persistence-associated alleles *still* aren't very common. They have frequency maxima of 2-5% today and are highly localized.
A lot of problems in science come down to whether larger amounts of noisy data are better or worse than smaller amounts of high-precision data. Of course, in paleoanthropology we usually are faced with small amounts of noisy data.
Our problems are that paleoanthropologists make up for shortfalls in data by carting in models and assumptions. These take on a life of their own, so much that even new discoveries that provide high-precision data cannot make a dent in most people's research direction.
I'm reading very carefully today an article by @Keilmesser and Marlize Lombard, which presents a very conventional view that large-brained hominins must have made MSA toolkits and smaller-brained hominins could not have done so. It's a thoughtful paper, but I'm unpersuaded.
Most people have around a chromosome's worth of DNA from Neandertals, spread in small pieces across all 46 chromosomes.
Or, if you're of male sex, 45 out of 46 of them.
For western Eurasian peoples, the average amount of Neandertal DNA across the genome is around 120 megabases. Eastern Eurasian peoples have a bit more. Chromosome 13 is 114 Mb and 12 is 133 Mb.