Period was previously thought to be ice-free
Arlington, Va.-Scientists using cores drilled from the New Jersey coastal plain have found that ice sheets likely caused massive sea level change during the Late Cretaceous Period -an interval previously thought to be ice-free. The scientists, who will publish their results in the March-April issue of the Geological Society of America (GSA) Bulletin, assert that either ice sheets grew and decayed in that greenhouse world or our understanding of sea level mechanisms is fundamentally flawed.
Led by Kenneth Miller of Rutgers University, the scientists examined cores from Ocean Drilling Program Leg 174AX, an onshore extension of an offshore expedition. They found indications that sea level changes were large (more than 25 meters) and rapid (occurring on scales ranging from thousands to less than a million years) during the Late Cretaceous greenhouse world (99- 65 million years ago).
Cheryl Dybas | NSF
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