Fig. 2 in Orthid brachiopods from the Middle Ordovician of the Central Iberian Zone, Spain

Fig. 2. Generalised stratigraphical columns of the Middle Ordovician rocks in the southern Central Iberian Zone, representatives of the three main areas (A–C) represented on Fig. 1, to show the vertical distribution of the studied brachiopod taxa. The left−hand column indicates the equivalence between the global chronostratigraphy and the north−Gondwanan regional scheme. Abbreviations: AQ, Armorican Quartzite; GF, Guindo Formation; Fe, thin oolithic ironstone bed. Note that the stratigraphic range of the graptolite biozones are directly annotated on the left side of each column.