Calcite granules and soil horizons

Through radiocarbon dating of calcite granules excreted by earthworms, researchers have produced a chronology of soil horizons formed between 47,000 and 20,000 years ago in a reference loess sequence in Germany’s Rhine Valley that helped link soil horizons with known warm periods in Greenland during the last ice age; the study also reveals complex climate dynamics at mid-latitude that were not previously identified from Greenland oxygen isotope records for the Last Glacial Maximum, findings that reveal the high sensitivity of loess paleoenvironments to Northern Hemisphere climate change. - Read at PNAS

Article #16-14751: “The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules,” by Olivier Moine et al.