Evidence for a Neoproterozoic Snowball Earth in the sedimentary record has been controversial. A weathered horizon preserved in sedimentary rocks from Svalbard may provide a rare signature of prolonged global glaciation.
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Allen, P. Snowball climate conundrum. Nature Geosci 8, 668–669 (2015). https://doi.org/10.1038/ngeo2504
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DOI: https://doi.org/10.1038/ngeo2504
