Zircon U–Pb results for the Cézarenque gneiss samples. (a,b) Tera–Wasserburg diagrams (²³⁸U/²⁰⁶Pb vs. ²⁰⁷Pb/²⁰⁶Pb). Error ellipses/ages are quoted at the 95% confidence level. Analyses were not corrected from common Pb. (c,d) Individual Furongian–Lower Ordovician ²⁰⁶Pb/²³⁸U dates (grey bars) and their distributions represented as Kernel Density Estimates (with an adaptative bandwidth). Only concordant data were considered. (e) Radial plot and Maximum Likelihood Age estimate for sample 18CEZ01 (see Vermeesch, 2021).