Conifer fossil woods from the Santa Marta Formation (Upper Cretaceous), Brandy Bay,James Ross Island,Antarctica |
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| Institution: | 1. Department of Geology and Physics, University of Southern Indiana, 8600 University Blvd., Evansville, IN 47712, USA;2. Curator of Fossil Wood, Crater Rock Museum, 2002 Scenic Ave, Central Point, OR 97502, USA;1. Museo de Múzquiz, A. C., Zaragoza 209, C.P. 26340 Melchor Múzquiz, Coahuila, Mexico;2. Laboratorio de Ecología, Departamento de Zoología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340 Ciudad de México, Mexico |
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| Abstract: | Conifer fossil woods from the Santonian to lower Campanian Santa Marta Formation are anatomically studied in detail. The wood flora is dominated by conifers, mainly Araucariaceae. Conifer fossil woods represent 84% of the samples (26 of 31) of the assemblage. The remaining samples are dicotyledon woods which are not included in this study. Woods are mostly calcified and preservation is often excellent. Fossil woods include three species of Agathoxylon, Phyllocladoxylon antarcticum, Cupressinoxylon hallei and a new species of Cupressinoxylon, C. rotundum Pujana sp. nov. The conifer-dominated forests are consistent with the pollen and macrofloras previously described from sediments of the same stratigraphic unit. This fossil wood assemblage contributes to understand the floristic changes that took place in the Cretaceous forests. |
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| Keywords: | Fossil wood Wood anatomy Secondary xylem Systematics Antarctica Upper Cretaceous |
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