Fig. 4 in Recurrent volcanic activity recorded in araucarian wood from the Lower Cretaceous Springhill Formation, Patagonia, Argentina: Palaeoenvironmental interpretations

Fig. 4. XRD and SEM/EDS mineralogical and chemical analysis of Agathoxylon mendezii sp. nov. (MPM­PB­15596), Estancia El Álamo, Santa Cruz Province, Argentina, Berriasian–Valanginian. A. XRD pattern of the bulk sample showing quartz composition of the trunk. B. XRD pattern of the clay fraction showing no presence of clay minerals in the trunk. C, D. SEM of cross­field pits and tracheids in radial section. Note that quadrangular and rectangular areas correspond to the spot analysis shown in E–I. E–I. EDS patterns of xylem elements. E. Parenchyma ray cell wall. F. Inner aperture in cross­field pits. G, H. Tracheids cell walls. I. Tracheid pit cavity. All the EDS patterns are showing Si and O components.