Raymond Bradley Challenges Evidence Behind Meghalayan Age's 4,200-year Boundary
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Who gets to define the beginning and end of a geologic age? Numerous news outlets recently considered this question when the College of Natural Sciences's Distinguished Professor of Earth, Geographic, and Climate Sciences Raymond Bradley challenged the scientific basis for the Meghalayan Age, the youngest subdivision of the Holocene epoch, which was ratified by the International Commission on Stratigraphy—housed within the International Union of Geological Sciences (IUGS)—in 2018. Bradley argues that the evidence used to establish the Meghalayan's 4,200-year boundary is insufficient to demonstrate a globally significant climatic event, and he has called for the classification to be reconsidered.
In a recent paper, Bradley examined the paleoclimate evidence behind the boundary and concluded that the data do not adequately support treating an event recorded in a cave in Meghalaya, India, as a global geological marker.
“Other records from India and beyond indicate only gradual shifts in rainfall, not the sudden global drought needed to justify a geological boundary. What happens next is a matter of scientific housekeeping. Under IUGS rules, no revision can be made until a decade after an age is ratified—meaning 2028 at the earliest. But Bradley is clear about what should follow: ‘I think it will probably fade away, but the Commission should rescind their decision altogether,’ he underscored. For Meghalaya, the naming of the age was a moment of immense pride. It put the state on the scientific map in a way few could have imagined. Bradley, however, insists that while local pride is understandable, science must take precedence. ‘Unfortunately, it was erroneously chosen,’ he said. His words highlight the tension between symbolism and evidence—a reminder that while names can travel far, science is judged on data, not sentiment.
— The Hindustan Times
Bradley's argument underscores the importance of rigorous, globally representative evidence when establishing the boundaries that define Earth's geologic history.
Read more: MSN; The Hindustan Times; Inshorts; HubNews; The Shillong Times.