fucoids

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Trace fossil — Chirotherium footprints in a Triassic sandstone … Wikipedia
Fucoidal — Fu*coid al, a. 1. (Bot.) Fucoid. [1913 Webster] 2. (Geol.) Containing impressions of fossil fucoids or seaweeds; as, fucoidal sandstone. [1913 Webster] … The Collaborative International Dictionary of English
Brown algae — Temporal range: 150–0 Ma[1][2] … Wikipedia
Fucales — Taxobox name = Fucales image caption = Ascophyllum nodosum domain = Eukaryota regnum = Chromalveolata phylum = Heterokontophyta classis = Phaeophyceae ordo = Fucales ordo authority = Kylin subdivision ranks = Families subdivision =… … Wikipedia
fucoid — 1. adjective a) Resembling or relating to seaweeds of the genus Fucus. The first cell division in zygotes of the fucoid brown alga Pelvetia compressa is asymmetric ... b) Of sandstone: containing seaweed like markings. The Fucoid beds are quite… … Wiktionary

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