Figure 6: (a) The marble abacus under examination, Archaeological Site of Amphiareion in Oropos, Greece; SEM images of marble sample under examination showing (b, c) biopitting and microcolonial fungi (MCF) of the black yeast type; (d) biopitting and fresh breaking cleavage; (e) biofilm, pollen grain, and filaments of actinomycetes; and (f) lichen fungal mycelium, fungal hyphae, biofilm, and pitting.