Fungus, not comet or catastrophe, accounts for carbonaceous spherules in the Younger Dryas “impact layer”

Details Fungus, not comet or catastrophe, accounts for carbonaceous spherules in the Younger Dryas “impact layer” Fungus, not comet or catastrophe, accounts for carbonaceous spherules in the Younger Dryas “impact layer”

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3714302s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 14, CiteID L14302

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2

Biogeosciences: Macro- And Micropaleontology (3030, 4944), Global Change: Impacts Of Global Change (1225), Global Change: Abrupt/Rapid Climate Change (4901, 8408), Hydrology: Plant Ecology (0476), Oceanography: Physical: Eddies And Mesoscale Processes

Scientific paper

A claim attributes the onset of the Younger Dryas climate interval and a range of other effects ˜12,900 years ago to a comet airburst and/or impact event. One key aspect of this claim centers on the origin of carbonaceous spherules that purportedly formed during intense, impact-ignited wildfires. Samples from Pleistocene-Holocene sedimentary sequences in the California Channel Islands and other sites show that carbon spherules and elongate forms are common in samples dating to before, during, and well after the 12,900-year time horizon, including from modern samples. Microscopic studies show that carbon spherules have morphologies and internal structures identical to fungal sclerotia (such as Sclerotium and Cenococcum). Experimental charring of fungal sclerotia shows that their reflectance increases with temperature. Reflectance measurements of modern and late Pleistocene spherules show that the latter indicate, at most, low-intensity burning. These data cast further doubt upon the evidence suggesting a catastrophic Younger Dryas impact event.

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