Molecular clock madness
Category Archives: Epipaleolithic
|Source: El Universal[es], which has many more photos.|
In the particular case of La Pintada there are many markings of astronomical type, spots where it is indicated that the Sun illuminates in certain time of the year, signaling a date in their calendar. That way they knew that, when the Sun hit one of those marks, it was time to collect the pitahaya or that the rain period was nearing.
Source: El Universal[es] (includes a very beautiful photo-gallery).
|Archaeologist watches a lioness head
not mentioned in the sources
|We are what we eat
Reference paper: Christina J. Adler et al., Sequencing ancient calcified dental plaque shows changes in oral microbiota with dietary shifts of the Neolithic and Industrial revolutions. Nature 2013. Pay per view → LINK [doi:10.1038/ng.2536]
The Atlantic meridional overturning circulation affects the latitudinal distribution of heat, and is a key component of the climate system. Proxy reconstructions, based on sedimentary 231Pa/230Th ratios and the difference between surface- and deep-water radiocarbon ages, indicate that during the last glacial period, the overturning circulation was reduced during millennial-scale periods of cooling. However, much debate exists over the robustness of these proxies. Here we combine proxy reconstructions of sea surface and air temperatures and a global climate model to quantitatively estimate changes in the strength of the Atlantic meridional overturning circulation during the last glacial period. We find that, relative to the Last Glacial Maximum, the overturning circulation was reduced by approximately 14 Sv during the cold Heinrich event 1. During the Younger Dryas cold event, the overturning circulation was reduced by approximately 12 Sv, relative to the preceding warm interval. These changes are consistent with qualitative estimates of the overturning circulation from sedimentary 231Pa/230Th ratios. In addition, we find that the strength of the overturning circulation during the Last Glacial Maximum and the Holocene epoch are indistinguishable within the uncertainty of the reconstruction.
|Summary of thermohaline circulation (public domain, NASA)|
Decors comprise petroglyph’s in various forms, such as engravings,
bruising, pecking and pictographs in various colours, viz red, various
shades of red, white, black and green. The pictographs or paintings
usually illustrate human, animal, bird, tree and abstract geometric
figures and are depicted by stick figures, outlines, solid and X-ray
figures. he engravings usually exhibit elements of natural world as well
as abstract themes. The decorated shelters are spread in an area of
approximately 40 square kilometres, Sahu said.
|One of the arrowheads found|