Coniferous woods from the Albian (Piedra Clavada Formation) of Argentine Patagonia

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Palaeoworld Pub Date : 2024-11-19 DOI:10.1016/j.palwor.2024.11.004

Cosme F. Rombola , Roberto R. Pujana , Daniela P. Ruiz , Inés Aramendía

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引用次数: 0

Abstract

Five samples of silicified fossil woods were collected from the Lower Cretaceous Piedra Clavada Formation, Santa Cruz Province, Argentina. The preservation of the fossil woods varies. Two very poorly preserved specimens are classified as “indeterminate conifers”. Based on the wood anatomy of the remaining specimens, we identified two taxa: Brachyoxylon patagonicum (one specimen), possibly related to the extinct conifer family Hirmeriellaceae, and cf. Brachyoxylon/Agathoxylon (two specimens), possibly related to the Hirmeriellaceae or the Araucariaceae. All samples have distinct growth ring boundaries, indicating annual seasonality. Furthermore, the curvature of the rings and the minimum estimated diameter suggest that the woods came from mature trees. Decay patterns resembling those induced by contemporary xylophagous fungi were identified in one specimen. The presence of fossil woods possibly related to the Hirmeriellaceae and Araucariaceae in the Piedra Clavada Formation is consistent with previous palynological studies of this stratigraphic unit. These records support the dominance of conifers in the Early Cretaceous forests of Argentine Patagonia.

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来源期刊

Palaeoworld PALEONTOLOGY-

CiteScore

4.00

自引率

5.90%

发文量

期刊介绍： Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata