A diverse assemblage of Late Eocene woods from Oregon, western USA

Q3 Earth and Planetary Sciences Fossil Imprint Pub Date : 2022-01-01 DOI:10.37520/fi.2021.022

E. Wheeler, S. Manchester

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引用次数: 3

Abstract

Well-preserved silicified woods from a site near the town of Post, Oregon, western USA, provide insights into the late Eocene vegetation and climate ca. 36 million years and data for comparing with both older and younger wood floras regionally and globally. The composition of this wood flora, taken into consideration along with taxa identified from silicified fruits and seeds of the same locality, provides a more complete picture of the former vegetation. We recognize woods belonging to the families Anacardiaceae (Pistacia terrazasae sp. nov.), Cannabaceae (Celtis popsii sp. nov.), Cercidiphyllaceae (Cercidiphyllum cf. alalongum R.A.Scott et E.A.Wheeler), Fagaceae (Fagus dodgeii sp. nov., Lithocarpoxylon ashwillii sp. nov., Lithocarpoxylon sp., Quercus sp.), Hamamelidaceae (Hamamelidoxylon crystalliferum sp. nov., H. cf. suzukii E.A.Wheeler et T.A.Dillhoff), Juglandaceae (Pterocaryoxylon sp.), Malvaceae (Wataria kvacekii n. sp.), Platanaceae (Platanoxylon cf. haydenii (Felix) Süss et Müll.-Stoll, Platanus sp.), Sapindaceae (Acer, 2 spp.), Trochodendraceae (Trochodendron beckii (Hergert et H.K.Phinney) R.A.Scott et E.A.Wheeler). This assemblage, which we refer to as the Post Hammer flora (UF 279), is comparable in age to the nearby Teater Road flora known mainly from fossil leaf impressions. Comparing the functional traits of the Hammer woods to the older Clarno Nut Beds woods attests to changing climate in the region, including an increase in seasonality.

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美国西部俄勒冈州晚始新世木材的多样化组合

美国西部俄勒冈州波斯特镇附近的一处遗址保存完好的硅化木材，提供了大约3600万年始新世晚期植被和气候的见解，以及与区域和全球较老和较新木材区系进行比较的数据。考虑到这一木材植物群的组成，以及从同一地点的硅化果实和种子中鉴定的分类群，提供了一个更完整的以前植被的画面。我们认识到的树木属于槭树科(Pistacia terrazasae sp. 11 .)，大麻科(Celtis popsii sp. 11 .)，桦树科(Cercidiphyllum cf. alalongum R.A.Scott et E.A.Wheeler)，壳壳树科(Fagus dodgeii sp. nov.， Lithocarpoxylon ashwillii sp. nov.， Lithocarpoxylon sp.， Quercus sp.)，金线梅科(Hamamelidoxylon crystalliferum sp. nov.， h.c.f uzukii e.a.w wheeler et t.a.d ilhoff)，枣树科(Pterocaryoxylon sp.)， malvacekii (Wataria kvacekii n. sp.)，Platanoxylon (Platanoxylon cf. haydenii (Felix) s ss et m ll.;-Stoll, Platanus sp.)， Sapindaceae (Acer, 2 sp.)， Trochodendron beckii (Hergert et H.K.Phinney) R.A.Scott et E.A.Wheeler)。这个组合，我们称之为Post Hammer植物群(UF 279)，在年龄上与附近的Teater Road植物群相当，这些植物群主要来自化石叶片印象。将Hammer森林的功能特征与更古老的Clarno Nut Beds森林进行比较，证明了该地区气候的变化，包括季节性的增加。

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来源期刊

Fossil Imprint Earth and Planetary Sciences-Stratigraphy

CiteScore

1.70

自引率

0.00%

发文量

期刊介绍： Fossil Imprint (formerly Acta Musei Nationalis Pragae, Series B – Historia Naturalis) is an international, open access journal, publishing original papers and reviews of any length from all areas of paleontology and related disciplines, such as palaeoanthropology, biostratigraphy, palynology, and archaeobotany/zoology. All taxonomic groups are treated, including plants, invertebrates, vertebrates, microfossils, and ichnofossils, with a special emphasis on terrestrial and post-Palaeozoic marine biota. We encourage the publication of international meetings as well as special thematic issues. The aim of the journal is to spread the scientific knowledge with no restrictions, and to allow access to it to any interested person. Each article includes information about the date of receiving, accepting and issue.