Fig. 3
From: The formation of authigenic deposits during Paleogene warm climatic intervals: a review
Palaeogeographic map of Paleocene showing distribution of glauconite–phosphorite, glauconite–lignite and glauconite–oolitic ironstone associations (adapted from Boucot et al. 2013). Note that extensive glauconite–phosphorite association formed along the northern margin of African shelf. Further note that glauconite–lignite association remained confined to tropical climatic zones (numbers correspond to those provided in Table 1)