Fig. 1: Geobal paleogeography of the Late Triassic (~200 Ma).

Adapted from Ron Blakey, http:// https://deeptimemaps.com/, © 2016 Colorado Plateau Geosystems Inc. Yellow stars represent the study sites, including. The Haojiagou section (~60°N, high latitude) on the North China Craton, and the Qilixia section (~30–40°N, low/middle latitude) on the South China Craton. Circles and squares represent other marine and continental sections, respectively, for which mercury data have been generated, including Hg concentrations and isotopes for Nevada5, 36, St. Audrie’s Bay34, 36, and Levanto36; and Hg concentrations for Arroyo Malo34, Astartekløft34, Igounane34, Kuhjoch34, Partridge Island34; Stenlille-1/Stenlille-446, Rødby-146, Norra Albert/Albert-146, Csővár47, Arroyo Alumbre9, Lombardy Basin36, Mt. Sparagio36, and Haojiagou48.