Invertebrate ichnofossils and rhizoliths associated with rhizomorphs from the Marília Formation (Echaporã Member), Bauru Group, Upper Cretaceous, Brazil

The Marília Formation (Bauru Group, Upper Cretaceous, Brazil) has furnished a large array of vertebrate fossils. However, its ichnological and botanical contents are poorly explored to date. Here we report findings of invertebrate trace fossils (Beaconites isp., Skolithos isp., and Taenidium barrett...

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Bibliographic Details
Published in:Journal of South American earth sciences 2017-12, Vol.80, p.529-540
Main Authors: Mineiro, Adriano Santos, Santucci, Rodrigo Miloni, da Rocha, Dulce Maria Sucena, de Andrade, Marco Brandalise, Nava, William Roberto
Format: Article
Language:English
Subjects:
Ectomycorrhiza
Meniscate burrows
Paleosol
Saprotrophs
Scoyenia ichnofacies
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Summary:The Marília Formation (Bauru Group, Upper Cretaceous, Brazil) has furnished a large array of vertebrate fossils. However, its ichnological and botanical contents are poorly explored to date. Here we report findings of invertebrate trace fossils (Beaconites isp., Skolithos isp., and Taenidium barretti), rhizoliths associated with rhizomorphs with preserved hyphae, and fossil roots from the Echaporã Member, Marília Formation, São Paulo State, Brazil. The association of trace fossils suggest they can be regarded to the Scoyenia Ichnofacies. The rhizoliths indicate that at least two types of herbaceous/arbustive plants inhabited the area, one of them living in the vadose zone and the other one with roots closer to the water table, under arid/semiarid conditions. Sedimentological analyses suggest the studied outcrop comprises fluvial deposits, with predominance of sand bars that underwent different and relatively long periods of subaerial exposure. •Invertebrate ichnofossils are regarded to the Scoyenia Ichnofacies.•At least two different herbaceous/shrub plants were present in the Echaporã Member.•Rhizomorphs with preserved hyphae are associated to some rhizolith types.
ISSN:0895-9811
1873-0647
DOI:10.1016/j.jsames.2017.10.010