The armored burrow Nummipera eocenica from the upper Eocene San Jacinto Formation,Colombia: morphology and paleoenvironmental implications |
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| Authors: | Gabriel Mendoza-Rodríguez Luis A Buatois Daniel Rincón-Martínez M Gabriela Mángano Claudia Baumgartner-Mora |
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| Institution: | 1. Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK, Canada;2. gam102@mail.usask.ca;4. Gerencia de Desarrollo Tecnológico, Centro de Innovación y Tecnología, ICP-Ecopetrol S.A. Piedecuesta-Santander, Bucaramanaga, Colombia;5. Institute of Earth Sciences (ISTE), Université de Lausanne, Lausanne, Switzerland |
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| Abstract: | AbstractThe ichnospecies Nummipera eocenica occurs in thick-bedded, tabular bioclastic massive sandstone of the upper Eocene San Jacinto Formation in the San Jacinto Fold Belt Basin, Colombia. Nummipera eocenica is a vertical to oblique burrow locally displaying a conical shape. The lining structure of the specimens studied consists of uniformly distributed lepidocyclinids and operculinids, with tests typically dipping towards the burrow wall, and well-compacted lining. The burrow infill is identical to the host rock, a bioclastic sandstone with abundant bivalve fragments. The diagnosis of Nummipera is emended to include as components of burrow lining all representatives of the Subclass Rotaliana characterized by being lenticular to discoidal in shape. In the San Jacinto Formation, Nummipera eocenica is present in the transition between deltaic mouth-bar and carbonate platform deposits. |
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| Keywords: | Armored burrows ichnology San Jacinto Fold Belt Basin larger benthic foraminifera |
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