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Taenidium barretti ichnofabric and rainfall seasonality:Insights into dryland suites of Scoyenia ichnofacies

Journal of Palaeogeography 2023年第1期12卷 28-49页

作者： Diego Luciano Nascimento Renata Guimaraes Netto Alessandro Batezelli Francisco Sergio Bernardes Ladeira Daniel Sedorko ICHNOS Research Group Geology Graduate ProgramUnisinos UniversityAv.Unisinos95010 Sao LeopoldoRS93022-750Brazil Campinas State University Geology and Natural Resources DepartmentZeferino Vaz University CityBarao GeraldoCampinasSP13083-970Brazil Laboratory of Pedology(LABPED) Department of GeographyGeosciences InstituteGeosciencesState University of CampinasCampinasSP13083-855Brazil Museu Nacional Departamento de Geologia e PaleontologiaUniversidade Federal do Rio de Janeiro.Horto BotanicoParque Quinta da Boa VistaR.Gen.Herculano Gomes1340Sao CristovaoRio de JaneiroRJ20940-040Brazil

The present work analyzes the monotypic Taenidium barretti ichnofabric developed in abandoned channels and floodplains to understand its paleoecological significance in highly seasonal fluvial *** data come from the Cretaceous paleosols of the Marília Formation(Bauru Basin,SE Brazil),in which the *** ichnofabric and rhizoliths represent the biotic *** larvae are considered to be the most likely *** tracemakers in these *** intensity and recurrence of bioturbation suggest that the windows of opportunity for beetle population growth were very short and controlled by the progressive substrate desiccation after flood *** characteristics of the trace fossil assemblage suggest soil colonization by r-strategic organisms triggered by flooding events that provided the resource inputs necessary for their living during rainy *** results also show that in fluvial systems with high discharge variations,the boundaries between a“pre-desiccation suite”and a“desiccation suite”in the Scoyenia ichnofacies can be diffuse due to the short duration of colonization windows and progressive terrestrialization of floodplains and ***,the frequency of flooding events,the lowered water table,and the rapidity of substrate desiccation constrained colonization by other burrowers and may be considered as firstorder factors controlling the generation of a monotypic *** ***,the monotypic Taenidium ichnofabric in the Scoyenia ichnofacies context is an ichnomarker of brief windows for colonization in highly seasonal environments.

关键词： Ichnology Paleopedology Continental ichnofacies Meniscate burrows Ichnofabric

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