Fig. 1: Locality and stratigraphy of the investigated Xiliangsi Formation, Fanjiagou section, Middle Ordovician, Shaanxi, China. | Communications Biology

Fig. 1: Locality and stratigraphy of the investigated Xiliangsi Formation, Fanjiagou section, Middle Ordovician, Shaanxi, China.

From: Unveiling the early evolution of black corals

Fig. 1

a Geological maps showing the investigated Fanjiagou locality, the lower right thumbnail is adopted from a standard map of China (GS-2016-1549, Ministry of Natural Resources of China). b Stratigraphic column of the Xiliangsi Formation, Fanjiagou section. c, d Field images of the Fanjiagou section bearing nodule limestones (the yellow arrow in d) where the investigated black coral fossils of Sterictopathes seira sp. nov. were recovered. The index graptolite Unduloraptus austrodentatus indicating the bottom of the Darriwilian Stage, ELI-FJG01320 (e) ELI-FJG01285 (f). Scale bars: e, f = 500 μm.

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