Figure 1
From: Timing of the Brunhes-Matuyama transition constrained by U-series disequilibrium
(a) The sampling location, Irdi, close to the city of Erfoud in southeastern Morocco (photo generated from https://earth.google.com/web/, version 9.2.80.4). (b,d,e) Different types of travertine samples encountered, showing anarchic growth with pure calcite layers alternating with clay levels, especially in the upper part. (c) Some sections of the 12.6 m-long extracted core, with the substratum at the base (left to right: top to bottom of the core; base at far right in the image).
