Extended Data Fig. 1: Stratigraphic section of the Lower Wayao Member (LWM) of the Falang Formation. | Nature

Extended Data Fig. 1: Stratigraphic section of the Lower Wayao Member (LWM) of the Falang Formation.

From: A Triassic stem turtle with an edentulous beak

Extended Data Fig. 1

The section was found at Heshangjing, Baiyuncun of Xinpuxiang in Guanling of Guizhou Province, near the locality of E. sinensis. The Guanling biota originates in the lower part of the upper unit in the LWM. The LWM is about 14.5 m thick in this section, nearly 2.5 m thicker than that of the Wolonggang quarry section near the village of Xiaowa (Supplementary Information). The block of the black shaly marlstone containing E. sinensis is full of small bivalves, whereas the block of thin marlstones containing O. semitestacea has large bivalves (species of Halobia and Daonella) and also scattered ammonites (species of Trachyceras and Paratrachyceras). The horizon where E. sinensis originated is 7.5 m below the one that contained O. semitestacea but slightly above the dark grey, marly, laminated micritic limestones that produce abundant skeletons of ichthyosaurs, thalattosaurs and placodonts as well as other fossils (Supplementary Information).

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