Deoxygenation in the Equatorial Panthalassan Ocean Predated the End-Triassic Mass Extinction

A groundbreaking study reveals that deoxygenation in the equatorial Panthalassan Ocean began well before the end-Triassic mass extinction, challenging previous assumptions about the timing and causes of this critical event. Researchers analyzed stratigraphic, biostratigraphic, and geochemical data from the Grotto Creek section in Alaska, spanning the Late Triassic to Early Jurassic period. The dataset includes high-resolution measurements of organic carbon and nitrogen stable isotopes (δ¹³C and δ¹⁵N) as well as iron speciation, providing a detailed record of oceanic conditions during this pivotal interval. Samples were collected from Wrangell–St. Elias National Park and Preserve, offering unique insights into the environmental changes that preceded one of Earth's most significant mass extinctions.

McCabe, K., & Gill, B. (2026). Deoxygenation in the Equatorial Panthalassan Ocean Predated the End-Triassic Mass Extinction [Dataset]. figshare. https://doi.org/10.6084/M9.FIGSHARE.31286599