A unique Late Cretaceous fossil wood assemblage from Chilean Patagonia provides clues to a high-latitude continental environment

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2023-12-13 DOI:10.1002/spp2.1536

Leandro C. A. Martínez, Marcelo Leppe, Leslie M. E. Manríquez, Juan Pablo Pino, Cristine Trevisan, Joseline Manfroi, Héctor Mansilla

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Abstract

Fossil plants, including large trunks, stems, some branches, and twigs, were collected from the Maastrichtian (68.9 Ma), upper Dorotea Formation in the Magallanes–Austral Basin, 16 km north of the Cerro Guido–Las Chinas complex in the southern Chilean Magallanes region. These fossil trunks range from 0.2 to 2.2 m in length. Petrographic slides were made in three sections (transverse, radial and tangential) and analysed under a light microscope to study the permineralized fossils. The woods and stems belong to Austroginkgoxylon gen. et sp. nov., Agathoxylon antarcticum, Podocarpoxylon paradoxi sp. nov., Podocarpoxylon mazzonii, Palmoxylon subantarcticae and Notomalvaceoxylon magallanense gen. et sp. nov. The growth rings of gymnosperms and anatomical characters of angiosperms were analysed to obtain palaeoecological data. Interactions between gymnosperm roots growing into the secondary xylem of an angiosperm (nurse logs) are recorded. The data obtained from the fossil woods suggest warm and humid conditions in this southern South American locality during the Late Cretaceous, providing a unique opportunity to study continental environments at high southern latitudes, which are poorly represented on a global scale.

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智利巴塔哥尼亚独特的晚白垩世木材化石群提供了高纬度大陆环境的线索

在智利马加兰山脉南部 Cerro Guido-Las Chinas 建筑群以北 16 公里处的马加兰山脉-澳大利亚盆地马斯特里赫特期（68.9Ma）多罗特亚地层上部采集到了植物化石，包括大型树干、茎、部分树枝和小树枝。这些化石树干长度从 0.2 米到 2.2 米不等。我们制作了三个切面（横向、径向和切向切片）的岩相切片，并在光学显微镜下进行分析，以研究过矿化的化石。木材和茎分别属于 Austroginkgoxylon gen.通过分析裸子植物的生长年轮和被子植物的解剖特征，获得了古生态学数据。记录了长入被子植物次生木质部的裸子植物根之间的相互作用。从化石林中获得的数据表明，在晚白垩世期间，南美洲南部地区气候温暖湿润，这为研究在全球范围内代表性较差的南高纬度大陆环境提供了一个独特的机会。

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来源期刊

Papers in Palaeontology PALEONTOLOGY-

CiteScore

4.50

自引率

4.30%

发文量

期刊介绍： Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.