New fossil woods from the middle Eocene climate optimum of north-central Turkey

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY
Ünal Akkemik, Özlem Toprak, Dimitra Mantzouka
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Abstract

The middle Eocene climate optimum, a crucial greenhouse event in Earth’s life history, occurred approximately 40 Ma. Fossil wood identifications of middle Eocene age reveal important evidence for the terrestrial tropical/subtropical conditions during this period. The purpose of the present study is to identify new fossil woods from the middle Eocene of north-central Turkey and to evaluate the paleoclimate and paleovegetational history of the north-central Turkey based on new records. Seven fossil woods were collected from the middle Eocene Göynücek Volcanics of the Çekerek Formation (Sarıkaya village, close to Çekerek, Yozgat). Two new species Akkemik and Mantzouka, n. sp., and Akkemik and Mantzouka, n. sp., are described, together with two more coniferous species cf. () and cf. . Although dealing with a rather low number of fossil wood findings, indistinct boundaries of the tree rings, low xeromorphy ratios and high conductivity values in these two new fossil angiosperm species and less visible and indistinct boundaries in the two fossil coniferous species may reflect the warm, humid tropical conditions of the middle Eocene of north-central Turkey. The results are consistent with our former paleoecological evaluation based on the fossil woods including Akkemik and Mantzouka in from the same geological unit and from the same area.
土耳其中北部中始新世最佳气候的新木材化石
中始新世最佳气候期是地球生命史上一个关键的温室事件,大约发生在 40 Ma。中始新世的木化石鉴定揭示了这一时期陆地热带/亚热带条件的重要证据。本研究的目的是鉴定土耳其中北部中始新世的新木材化石,并根据新记录评估土耳其中北部的古气候和古植被历史。研究人员从切凯雷克地层的中始新世戈伊努切克火山岩(位于约兹加特省切凯雷克附近的萨勒卡亚村)中采集了七种木化石。描述了两个新种 Akkemik 和 Mantzouka,n. sp.,以及 Akkemik 和 Mantzouka,n. sp.,还有两个针叶树种 cf. ()和 cf. ()。虽然发现的木化石数量较少,但这两个新的被子植物化石物种的树木年轮边界不清晰、异形比低和电导率值高,以及两个针叶树化石物种的边界不明显和不清晰,可能反映了土耳其中北部始新世中期温暖潮湿的热带条件。这些结果与我们之前根据同一地质单元和同一地区的化石树林(包括 Akkemik 和 Mantzouka)进行的古生态评估结果一致。
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来源期刊
Palaeoworld
Palaeoworld PALEONTOLOGY-
CiteScore
4.00
自引率
5.90%
发文量
95
期刊介绍: Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata
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