Late Cretaceous flora of the Hidden Lake Formation,James Ross Island (Antarctica), its biostratigraphy and palaeoecological implications |
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| Affiliation: | 1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China;2. Earth Sciences, Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, IL 60605, USA;3. Qingdao Research Institute of Geotechnical Prospecting and Surveying, Qingdao 266030, China;4. School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China;5. Chicago Botanic Garden, Glencoe, IL 60022, USA;6. Oak Spring Garden Foundation, Upperville, VA 20184, USA;7. Yale School of the Environment, Yale University, New Haven, CT 06511, USA;1. School of Earth Sciences, The University of Melbourne, Victoria 3010, Australia;2. GHD, 5 Church St, Traralgon, Victoria 3844, Australia;1. National Museum Prague, Václavské nám. 68, 115 79 Praha, Czechia;2. University of Coimbra, MARE - Marine and Environmental Sciences Centre, Largo Marquês de Pombal, 3030-790 Coimbra, Portugal;3. Fernando Pessoa University, Praça 9 de Abril, 4249-004 Porto, Portugal |
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| Abstract: | Plant fossils from the volcano-clastic marine deposits of the Coniacian Hidden Lake Formation of James Ross Island in Antarctica are described based on their macromorphology. Stratigraphic positions of fossiliferous horizons and details of the lithostratigraphic situation of the middle part of the Hidden Lake Formation are published for the first time. The flora consists primarily of leaf impressions and petrified wood. There are also small amounts of mesofossils, dispersed cuticles and charcoalified wood. The megafossils typically occur fragmented, underpinning their allochtonous origin. The plants are described in systematical order. This contribution in contrast to earlier observations reports a high diversity of pteridophytes (11 taxa) and conifers (6 taxa). Angiosperms representing families Nothofagaceae, Atherospermataceae, probably Lauraceae and Sterculiaceae are the most abundant and common plant groups of the flora (12 taxa). The presence of the tropical fern family Marattiaceae and rarity of the genus Nothofagus are of interest, arguing for the prevalence of a warm temperate to tropical humid climate during the Coniacian in this part of Antarctica. |
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| Keywords: | Antarctica Macroflora Coniacian Gustav group |
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