Figure from A Jurassic prehnite vein intruding the Permian-Triassic boundary at Graphite Peak, Antarctica

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Figure 2. Field photo ( A ) and photomicrograph under crossed nicols ( B ) of prehnite-vein near the boundary of the Buckley and Fremouw Formations at Graphite Peak, Antarctica. The subhorizontal prehnite vein is at the white arrow ( A ) in a vertical section that has been cleared of scree and swept clean with a broom. Bar scales are 1 m (for A ) and 1 mm (for B ).