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GSA Today Zealandia: Earth’s Hidden Continent Cover Image 2 GNS Science, P.O. Box 30368, Lower Hutt 5040, New Zealand 3 SGEES, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand 4 Service Géologique de Nouvelle Calédonie, B.P. 465, Nouméa 98845, New Caledonia 5 School of Geosciences, University of Sydney, NSW 2006, Australia Abstract A 4.9 Mkm 2 region of the southwest Pacific Ocean is made up of continental crust. The region has elevated bathymetry relative to surrounding oceanic crust, diverse and silica-rich rocks, and relatively thick and low-velocity crust...

 E-Mail IMAGE: Calcium carbonate samples from a sediment core drilled from the mid-Pacific Mountains show evidence of ocean acidification 127 to 100 million years ago. view more  Credit: Northwestern University EVANSTON, Ill. -- Around 120 million years ago, the earth experienced an extreme environmental disruption that choked oxygen from its oceans. Known as oceanic anoxic event (OAE) 1a, the oxygen-deprived water led to a minor -- but significant -- mass extinction that affected the entire globe. During this age in the Early Cretaceous Period, an entire family of sea-dwelling nann...

Volcanic Eruptions Directly Triggered Ocean Acidification During Early Cretaceous Details Share This Around 120 million years ago, the earth experienced an extreme environmental disruption that choked oxygen from its oceans. Around 120 million years ago, the earth experienced an extreme environmental disruption that choked oxygen from its oceans. Known as oceanic anoxic event (OAE) 1a, the oxygen-deprived water led to a minor — but significant — mass extinction that affected the entire globe. During this age in the Early Cretaceous Period, an entire family of s...