Table 2: Metamorphic processes preserved in early Archean supracrustal rocks of the Barberton Greenstone Belt, South Africa GroschEugene G. 2018 Kromberg metamorphic grade recalculated using chlorite compositions from Grosch <i>et al</i>. (2012) and the recently published chlorite geothermometry method of Bourdelle <i>et al</i>. (2013) that does not require estimates of XFe<sup>3+</sup>.