Quaternary petrified trunks from Kamphaeng Phet, Thailand: Implications for past climate and preservation

IF 1 4区 地球科学 Q4 PALEONTOLOGY Annales de Paleontologie Pub Date : 2024-01-01 DOI:10.1016/j.annpal.2023.102655
Nareerat Boonchai , Parichat Kruainok , George Mustoe , Suphunnee Chokkhun , Thanit Nonsrirach , Yupa Thasod , Marc Philippe , Paul J. Grote , Yongdong Wang
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Abstract

Petrified trunks in Mueang Kamphaeng Phet District, upper Central Thailand, were unearthed in Quaternary deposits on the western rim of the Ping River. The sediments consist mainly of semi-consolidated gravel, sand, silt, and clay, indicating that the woods were transported by the ancient Ping River. Macroscopic features revealed that preservation of these fossils (e.g., intercellular spaces, iron oxides, quartz crystals, colors, and weathering conditions) shared many similarities to some petrified trunks in Tak Province. We investigated both large (approx. 0.50–0.7 m wide, at least 10–20 meters long) and small fragments of fossils for both wood anatomical features and mineralogy. Diffuse porosity with indistinct growth rings and wide vessels at low densities suggest a tropical lowland forest paleoenvironment. Parenchyma patterns are aliform to confluent, banded, and diffuse-in aggregate. At least four distinct types of wood were recognized from this site. Among them, three wood types originate from legume trees (Fabaceae), while the fourth is from a eudicotyledonous tree. Two of the three legumes show closest resemblance to a tall (canopy emergent) legume tree, Koompassia cf. malaccensis Maingay ex Benth. and one resembles the legume Koompassia cf. malaccensis or cf. Pahudioxylon bankurensis Chowdhury, Ghosh, et Kazmi. The other legume-like wood shows banded parenchyma. Petrified wood from Kamphaeng Phet is correlative with other Quaternary paleofloras found in Northern Thailand in both preservation and taxa. The past climate, as inferred according to the Köppen-Geiger classification, was possibly similar to modern-day tropical rainforests (Af) in southern Thailand, Malaysia, and Indonesia in contrast to the modern vegetation in Mueang District, Kamphaeng Phet that is a mixed deciduous and dry dipterocarp forest where the modern climate in the area is tropical wet and dry (Aw).

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泰国 Kamphaeng Phet 的第四纪石化树干:对过去气候和保存的影响
泰国中上游 Mueang Kamphaeng Phet 县的石化树干出土于平河西缘的第四纪沉积物中。沉积物主要由半固结的砾石、沙、粉砂和粘土组成,表明这些木材是由古平河搬运而来的。宏观特征显示,这些化石的保存(如细胞间隙、氧化铁、石英晶体、颜色和风化条件)与德省的一些石化树干有许多相似之处。我们对大型(宽约 0.50-0.7 米,长至少 10-20 米)和小型化石碎片进行了木材解剖学特征和矿物学调查。弥漫的多孔性、不清晰的生长环和低密度的宽大血管表明这里是热带低地森林古环境。母质形态为鳞片状至汇合状、带状和扩散聚集状。该遗址至少发现了四种不同类型的木材。其中,三种木材来自豆科植物,第四种来自真叶树。这三种豆科植物中有两种与一种高大(树冠萌发)的豆科植物--Koompassia cf. malaccensis Maingay ex Benth.最相似,一种与豆科植物 Koompassia cf. malaccensis 或 cf. Pahudioxylon bankurensis Chowdhury, Ghosh, et Kazmi 相似。另一种类似豆科植物的木材显示出带状的实质组织。Kamphaeng Phet 的石化木材与泰国北部发现的其他第四纪古植物在保存和分类方面都具有相关性。根据 Köppen-Geiger 分类法推断,过去的气候可能与泰国南部、马来西亚和印度尼西亚的现代热带雨林(Af)相似,而 Kamphaeng Phet Mueang 区的现代植被则是落叶林和干燥的双子叶混交林,该地区的现代气候为热带湿润干燥气候(Aw)。
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来源期刊
Annales de Paleontologie
Annales de Paleontologie 地学-古生物学
CiteScore
1.70
自引率
10.00%
发文量
8
审稿时长
>12 weeks
期刊介绍: Créées par Marcellin Boule en 1905, les Annales de Paléontologie publient 4 numéros par an traitant des fossiles animaux et végétaux, dans tous les domaines de la paléontologie incluant : -La Paléoanatomie- La Paléohistologie- La Morphologie fonctionnelle- La Systématique- L''Évolution- La Paléoécologie ... et toute les contributions susceptibles d''améliorer la compréhension des organismes et des environnements éteints.
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editorial board A new species of the genus Pseudaturoidea Shimansky, 1975 (Pseudonautilidae, Nautiloidea) from the Lower Cretaceous of south-eastern France First record of serpulids from the Cretaceous (Maastrichtian) of Türkiye Extirpation of the currently endangered mollusc Patella ferruginea through the Mediterranean during the Pleistocene: A matter of human harvesting or environmental factors? A palaeobiological revision of the species Ammonites flexisulcatus d’Orbigny, 1840 (Ammonoidea) from the upper Aptian of southern France
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