Cocoseae:印度中部中央邦德干 K-Pg 植物区系中的一种主要类人猿棕榈元素

IF 1.9 3区 地球科学 Q1 GEOLOGY Cretaceous Research Pub Date : 2024-08-09 DOI:10.1016/j.cretres.2024.105974
Sanchita Kumar , Steven R. Manchester , Mahasin Ali Khan
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引用次数: 0

摘要

在这里,我们报告了大量具有独特发芽孔的化石果实以及石化茎干的发现,这些果实在形态和解剖学上与 Arecoideae 亚科现生棕榈属 Cocoseae Mart.从印度中部中央邦 Dindori 地区 Umariya Ryt.村的 Deccan Intertrappean Beds(晚马斯特里赫纪-早丹纪沉积物;约 66-65 Ma)中发现了被归类为 Palmocarpon drypeteoides (Mehrotra, Prakash, and Bande) 曼彻斯特等人的过矿化果实和子房室铸件,以及 Palmoxylon sp.的茎。通过使用微型计算机断层扫描(mCT)和标准薄片方法,我们首次观察到这些棕榈果化石具有宿存的基部三叉花被。这些化石以及其他文献报道表明,茧状棕榈在中央邦德干岩间地层的类茧棕榈中占主导地位。目前,现代亲缘植物并不生长在同一地区,但它们出现在印度东南部和东部的热带森林以及其他地区,包括南美洲、亚洲、欧洲和非洲的部分地区。蝶形花掌的扩张和消退很可能与气候变化同时发生。在同一化石地点发现的茧状化石(目前和之前报道的化石)以及之前描述的热带元素表明,在沉积期间存在热带气候条件。我们还重新审视了茧状棕榈的历史植物地理学。
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Cocoseae: A dominant arecoid palm element in the Deccan K-Pg flora of Madhya Pradesh, Central India

Here, we report the occurrence of a large number of fossil fruits with distinctive germination pores along with a petrified stem, resembling morphologically and anatomically the extant palm tribe Cocoseae Mart. ex Dumort. of the subfamily Arecoideae. The permineralized fruits and locule casts, assigned to Palmocarpon drypeteoides (Mehrotra, Prakash, and Bande) Manchester et al., and the stem of Palmoxylon sp. were recovered from the Deccan Intertrappean Beds (late Mastrichtian–early Danian sediments; c. 66–65 Ma) of Umariya Ryt. village in Dindori District, Madhya Pradesh, Central India. Using micro–computed tomography (mCT) and standard thin section methods, we observed for the first time that these fossil palm fruits have a persistent basal trimerous perianth. These fossils, along with other reports in the literature, suggest that cocosoid palms were dominant among the arecoid palms of the Deccan Intertrappean beds in Madhya Pradesh. At present, the modern relatives do not grow in the same area but they occur in tropical forests of southeastern and eastern India as well as other regions including parts of South America, Asia, Europe, and Africa. The expansions and retraction of the cocosoid palms likely coincide with climate change. The recovery of cocosoid fossils (present and earlier reported) and previously described tropical elements from the same fossil locality suggest the existence of tropical climatic conditions during the period of depositions. We also revisit the historical phytogeography of the cocosoid palms.

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来源期刊
Cretaceous Research
Cretaceous Research 地学-地质学
CiteScore
4.10
自引率
19.00%
发文量
235
审稿时长
12 weeks
期刊介绍: Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.
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