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Volume 91, Number 5
May 2021

ISSN: 1527-1404
EISSN: 1938-3681
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Cover Image
Cover Image
COVER EXPLANATION.—Cross section (3 cm thickness) of a microbial flat in Paso Seco (Argentina), northern Patagonia. A vertebrate footprint compressed the microbial layers below. At the top, a sand ripple (0.5 mm height) formed over a planar microbial layer. See Cuadrado et al., this issue.
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