English: Cyanobacterial microfossils
Clusters of variably packed cyanobacterial remains of the annulated tubular microfossil Oscillatoriopsis longa (Gum quarry, Kinnekulle, Västergötland, Sweden; Cambrian Series 3, Guzhangian Stage, Agnostus pisiformis Biozone). A, UB W 459, loosely arranged cylindrical tubes (upwards arrows) set in a phosphatic matrix (downwards arrows). B, UB W 460, flexuous and sinuous specimens intertwined with one another; note the close association of filaments with significantly different size diameter (arrows). C, UB W 461, cyanobacterial remains embedded into a phosphatic matrix; upward arrow points to an empty semi-circular sheath, whereas downwards arrow indicates a solid rod-shaped microfossil interpreted as possible remains of a trichome. D, UB W 462, cluster with short fragments of closely packed and curved tubular microfossils. E, UB W 463, broad and straight tubes running subparallel to one another. F, UB W 464, comprising several flexuous fragments of variable length. G, UB W 465, broad and slightly curved tubes of variable length. H, UB W 466, 3 mm long flexuous tubes associated with much shorter fragments (arrows). I–J, clusters with enrolled specimens; I, UB W 467; J, UB W 468. Scale bars represent: 200 μm (A–D, F, H, I); 100 μm (E, G, J).