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" ... Data supports such a die-off in the Southern hemisphere, but Melott says that their hypothesis would be bolstered if researchers could find a pristine stratigraphic fossil record that showed no evidence of an Ordovician extinction in the Northern hemisphere; that is, in parts of present-day British Columbia or Manchuria in China. ... "
" ... However, what is the stratigraphic evidence laid forth to suggest we are in the Anthropocene? Geologists recognize new and novel materials present on Earth, which will one day be lithified and turned into sedimentary rock. These include concrete, plastics, aluminum, black carbon (soot), etc. These distinct and previously unseen materials make a marketed global increase in presence around 1950. For example, more than half of the concrete used in history was produced in the past 20 years. We also see increased sedimentary fluxes into our oceans as deforestation and road construction enhanced erosion. Therefore, the study suggests we've entered into the Anthropocene beginning circa 1945 to 1964. ... "
" ... In the final note Darwin considers the possibility that the similarities between the fossil shells and the recent ones could also be explained by a short interval of time between the formation of the white rock and the deposition of the modern beach. However accepting a young age for the fossil beach deposits and the even younger eroded remains of the volcanic island of St. Jago, the coastal lava shields are covering Darwin's white rocks and therefore according to stratigraphic principles are younger, would invoke some unknown and presumably catastrophic geological event in the not too distant past to explain its actual deep incised valleys. ... "
" ... Past attempts to date the iridium peak and the moment of the impact, showing age discrepancies of a few hundred to thousand years, made many researchers doubt that the iridium anomaly and the age of the Chicxulub Crater coincide. But the new study based on a complete stratigraphic record and carried out by labs in Austria, Belgium, Japan, and the United States, suggests that the dust of the impact circulated in the atmosphere for no more than a couple of decades. The highest concentrations of iridium were found within a 5-centimeter section of the rock core retrieved from the top of the crater's outer rim, formed immediately after the impact as rocks rebounded then collapsed from the force of impact. ... "