New records of Upper Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

IF 1.8 3区地球科学 Q2 PALEONTOLOGY Acta Palaeontologica Polonica Pub Date : 2022-01-01 DOI:10.4202/app.00939.2021

Laura Vallejos Leiz, A. Crisafulli, Gnaedinger Silvia

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引用次数: 1

Abstract

We report gymnospermous wood found in sandstone and siltstone beds of the Upper Triassic Hilario Formation, Sorocayense Group at Hilario Creek located in San Juan province, Argentina. The identified xylotaphoflora comprises Baieroxylon cicatricum (Ginkgoales) and a new species of Protophyllocladoxylon (Coniferales), it constitutes the first reports of these taxa from the Triassic in Argentina. Protophyllocladoxylon hilarioense sp. nov. differs from the other species by the following combination of anatomical characters: radial pits araucarian, mixed and some with abietinian tendency, uni-biseriate; contiguous, separated; tangential pits uni-biseriate; cross-field pits are simple elliptic, oblique, one to two in number and low uni-biseriate rays. The growth rings in the reported woods show a gradual transition from earlywood to latewood, suggesting little change in the climatic conditions experienced during their growth. The type of growth rings observed is consistent with a humid but seasonally dry subtropical climate. These woods are representatives of the arboreal stratum of a mesophytic association.

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阿根廷上三叠统木材新记录及其生物地层学、古气候和古生态意义

本文报道在阿根廷圣胡安省Hilario Creek地区Sorocayense群上三叠统Hilario组砂岩和粉砂岩层中发现裸子植物木材。经鉴定的xylotaphoflora包括Baieroxylon cicatricum(银杏属)和Protophyllocladoxylon(针叶树属)一新种，是阿根廷三叠纪首次报道的xylotaphoflora。hilarioense protophylocladoxylon sp. 11 .不同于其他种的解剖特征组合如下:径向凹穴雌雄同体，混合或部分有直立倾向，单双系;连续的,分开的;切向凹坑单双列;交叉场凹坑是简单的椭圆形，斜的，一到两个数量和低单双缝射线。所报道的树木的年轮显示了从早木到晚木的逐渐过渡，表明在其生长过程中经历的气候条件几乎没有变化。观察到的年轮类型与湿润但季节性干燥的亚热带气候相一致。这些树木是叶生植物群落中乔木层的代表。

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来源期刊

Acta Palaeontologica Polonica 地学-古生物学

CiteScore

2.80

自引率

5.60%

发文量

审稿时长

12.5 months

期刊介绍： Acta Palaeontologica Polonica is an international quarterly journal publishing papers of general interest from all areas of paleontology. Since its founding by Roman Kozłowski in 1956, various currents of modern paleontology have been represented in the contents of the journal, especially those rooted in biologically oriented paleontology, an area he helped establish. In-depth studies of all kinds of fossils, of the mode of life of ancient organisms and structure of their skeletons are welcome, as those offering stratigraphically ordered evidence of evolution. Work on vertebrates and applications of fossil evidence to developmental studies, both ontogeny and astogeny of clonal organisms, have a long tradition in our journal. Evolution of the biosphere and its ecosystems, as inferred from geochemical evidence, has also been the focus of studies published in the journal.