That estimate is backed up by paleomagnetic data, which show that this portion of the reef must have formed after Earth's magnetic poles last reversed, some 790,000 years ago. (sciencemag.org)
It's attractive in that it explains several lines of otherwise problematic evidence (near - ubiquitous glacial sediments, including many in paleo - low latitudes as indicated by paleomagnetic studies, overlain by equally ubiquitous «cap carbonates» (resulting from a CO2 insolubility spike at Snowball Earth termination). (climateaudit.org)
Paleomagnetic studies of a meteorite from asteroid Vesta reveal remanent magnetization produced by an ancient core dynamo. (science.sciencemag.org)