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Song, Hanzhang [1], Naugolnykh, Sergey [2], Liu, Xiaoyan [3], Jin, Jianhua [1].

Fertile Woodwardia from the middle Eocene of South China and its implications for palaeogeography and palaeoclimate.

Extant species of Woodwardia Sm. are distributed throughout Central and North America, Europe and the temperate to tropical areas in Asia. The fossil records of this genus were found throughout the Paleogene and the Neogene  of North America, Europe and Asia. However, the well-preserved fertile pinna fossils of this genus have not been reported in South China so far. In this paper, a new Woodwardia species is described from the middle Eocene of Changchang Basin, Hainan Island, South China. Macromorphological and micromorphological features of the fertile pinna show straight pinna rachis, alternate, subtriangular pinnules, acute pinnule apex, almost entire or slightly undulate pinnule margins, long-ovoid sori, stalked sporangia and spores with ridges on sporoderm surface, which are characterized in detail. Generally, the present fossil is most similar to the extant species Woodwardia japonica (L.f.) Sm., which prefer to grow in a warm or moist environment. The discovery of this new species from the Changchang Basin of Hainan Island indicates that this genus has been distributed in the low-latitude tropical regions of South China as early as the middle Eocene. Combine with the study of ferns from the same site estimated before, it is supposed that the climate of Paleo-Hainan landscape corresponding to the time of forming of the Changchang Formation was warm and humid, similar to the conditions of this region in the present time.

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1 - Sun Yat-sen University, State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School Of Life Sciences, 135 Xingangxi Road, Guangzhou, Guangdong, 510275, China
2 - Geological Institute of Russian Academy of Sciences, Contract affiliation: Kazan Federal University, Republic of Tatarstan, Russia, Moscow, 119017, Russia
3 - South China Normal University, School Of Geography, No.55, West Of Zhongshan Avenue, Tianhe District, Guangzhou, 44, 510631, China

Hainan Island
South China.

Presentation Type: Oral Paper
Session: PL2, Paleobotany: Cookson Student Presentations - Session II
Location: /
Date: Monday, July 19th, 2021
Time: 12:30 PM(EDT)
Number: PL2001
Abstract ID:1006
Candidate for Awards:Isabel Cookson Award,Maynard F. Moseley Award

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