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Late Cretaceous Mega-, Meso-, and Microfloras from Lower Silesia

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Late Cretaceous Mega-, Meso-, and Microfloras from Lower Silesia Late Cretaceous mega-, meso-, and microfloras from Lower Silesia ADAM T. HALAMSKI, JIŘÍ KVAČEK, MARCELA SVOBODOVÁ, EWA DURSKA, and ZUZANA HEŘMANOVÁ Halamski, A.T., Kvaček, J., Svobodová, M., Durska, E., and Heřmanová, Z. 2020. Late Cretaceous mega-, meso-, and microfloras from Lower Silesia. Acta Palaeontologica Polonica 65 (4): 811–878. Late Cretaceous plants from the North Sudetic Basin (Lower Silesia, south-western Poland) are reviewed on the basis of megaflora from 17 localities (270 identifiable specimens), mesoflora from two localities, and microflora from four localities. Major sites are Rakowice Małe and Bolesławiec. Eight megafloral assemblages are distinguished (Assemblage 1, Turonian; Assemblages 2, 3, lower–middle Coniacian; Assemblages 4, 5, upper Coniacian?–lower Santonian?; Assemblages 6–8, lower–middle Santonian); the bulk of the palaeoflora is from Assemblages 4–6 and 8. Megaflora consists of 29 taxa (6 ferns, 4 conifers, and 19 angiosperms). Geinitzia reichenbachii is the most common species. Dryophyllum westerhausianum (Richter, 1904) Halamski and Kvaček comb. nov. is a trifoliolate leaf re-interpreted as a representative of Fagales. Three species of Dewalquea are distinguished: Dewalquea haldemiana, Dewalquea insignis, and Dewalquea aff. gelindenensis. Platanites willigeri Halamski and Kvaček sp. nov. is characterised by trifoliolate leaves, the median leaflet of which is ovate, unlobed, with a serrate margin, and cuneate base. Palaeocommunities inferred from the megafossil record include: a back swamp forest dominated by Geinitzia, with abundant ferns; a Dryophyllum-dominated riparian forest; a forest with Dewalquea and Platanites willigeri possibly located in the marginal part of the alluvial plain; dunes with D. haldemiana and Konijnenburgia; a fern savanna with patches of Pinus woodlands. Palynoassemblage A from the Nowogrodziec Member, studied mostly at Rakowice Małe and Żeliszów, consists of 126 taxa, including 105 terrestrial palynomorphs (54 bryophyte, lycophyte, and pteridophyte spores, 16 gymnosperms, 35 angiosperms). The mega- and mesofossil records are dominated by angiosperms; the palynoassemblages are dominated by ferns. Palaeocommunities represented solely by the microfossil record are halophytic (with Frenelopsis and unconfirmed presence of Nypa) and pioneer vegetation. Palaeocommunities are intermediate in general character between those pre-dating the Cretaceous Terrestrial Revolution and modern, angio- sperm-dominated vegetation. In comparison to older plant assemblages from contiguous areas laurophylls are much rarer; this might correspond to a real phenomenon of exclusion of lauroids from Santonian riparian forests. The studied assem- blage is more similar to younger palaeofloras than to older ones; this might be interpreted as stabilisation of communities after a period of pronounced change related to the rise to dominance of the angiosperms. In contrast to widespread endemism among vertebrates of the European Archipelago, the plant cover consists mostly of species that are widely distributed. Key words: Angiospermae, Leptosporangiatae, palaeobotany, palynology, taxonomy, Coniacian, Santonian, Poland. Adam T. Halamski [[email protected]], Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland. Jiří Kvaček [[email protected]] and Zuzana Heřmanová [[email protected]], National Museum, Václavské náměstí 68, 115 79 Praha 1, Czech Republic. Marcela Svobodová [[email protected]], Institute of Geology of the Czech Academy of Sciences, Department of Paleobiology and Paleoecology, Rozvojová 269, 165 00 Praha 6, Czech Republic. Ewa Durska [[email protected]], Faculty of Geology, University of Warsaw, ul. Żwirki i Wigury 93, 02-089 Warszawa, Poland. Received 4 March 2020, accepted 6 August 2020, available online 13 November 2020. Copyright © 2020 A.T. Halamski et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. portant in the early days of palaeobotany (Goeppert 1844: Introduction 161–163). The first fossil vegetal remains ever figured as such may have been Carboniferous plants from Silesia (Volkmann The region of Lower Silesia (Dolny Śląsk, Niederschlesien 1720) and plant fossils from Lower Silesia were discussed by in former German literature, south-western Poland) was im- Schlotheim (1820), Sternberg (1821), and Rhode (1821–1823). Acta Palaeontol. Pol. 65 (4): 811–878, 2020 https://doi.org/10.4202/app.00744.2020 812 ACTA PALAEONTOLOGICA POLONICA 65 (4), 2020 Late Cretaceous plant assemblages from Silesia range from overview of “nearly finished works” on that subject was the Cenomanian (Goeppert 1841; Niebuhr 2019) through published as a summary of a lecture given on 1st November the Turonian (Macko 1963; Płachno et al. 2018), Coniacian 1865 (Goeppert 1866a). A paper on Cretaceous index plants (Velenovský 1883; Langenhan and Grundey 1891; Frič 1897; (Goeppert 1886b) included data from a few localities in Halamski and Kvaček 2015) to the Santonian (Roemer 1889; Lower Silesia (“Geinitzia cretacea” Ulina, Nowogrodziec, Halamski et al. 2018b). Bolesławiec, Rakowice Małe; “Cunninghamites oxycedrus” The aim of the present paper is the systematic descrip- Rakowice Małe; “Credneria sp.” Wartowice Nowe (erro- tion of plant fossils and palaeoecological reconstruction of neously as Cenomanian); “Debeya serrata” Ołdrzychów, communities found in outcrops situated in the North Sudetic probably erroneously for Ulina; “Gleichenia dresleriana” Basin (study area ca. 300 km2) and ranging from Turonian environs of Lwówek). However, no systematic treatment to Santonian in age. The assemblages consist of mega-, has ever appeared, so Goeppert’s identifications cited by meso- and microfossils; a complete treatment of the mega- Geinitz (1849–1850), Williger (1882: 84, 86–89, 94, 102, flora and a synopsis of the microflora are provided, whereas 104–108), and after him by Scupin (1913: 65) and Milewicz mesofossils have been treated separately (Heřmanová et al. (1997: 31), are in some cases nomina nuda. They are dis- 2019; ZH, JK, ATH, and Jiřina Dašková, unpublished ma- cussed in the systematic part of the present paper. terial), so only a general account of the mesoassemblage is Cretaceous angiosperms from the North Sudetic Basin given here. were first recorded in print by Drescher (1863) from the “Schichten von Neu-Warthau” (Assemblage 2 herein). Institutional abbreviations.—BGR, Bundesanstalt für Geo- Among several dozens of animal taxa he mentioned also wissenschaften und Rohstoffe, Berlin-Spandau, Germany; “Credneria denticulata Z.” and the conifer “Geinitzia creta- MB, Museum für Naturkunde, Berlin, Germany; MGUWr, cea Endl.” (Drescher 1863: 311). Geinitzia was also reported Muzeum Geologiczne Uniwersytetu Wrocławskiego, from Ołdrzychów by Klocke (1864: 262). Wrocław, Poland; MMG, Museum of Mineralogy and The paper by Williger (1882), although devoted pri marily Geology, Senckenberg Natural History Collections Dres- to stratigraphy and the fossil fauna of the North Sudetic den, Germany; NMP, National Museum, Prague, Czech Basin, is nonetheless of special importance, insofar as in Republic; ZPAL, Institute of Paleobiology, Polish Academy several cases it has been the only source providing detailed of Sciences, Warsaw, Poland. lists of plant taxa coming from single outcrops, allowing thus to supplement, or even to correct, laconic or partly false Other abbreviations.—≡, homotypic synonym (ICN, Art. labels. The debt of the present authors to Gustav Williger 14.4); auct., auctorum (Latin: of authors), for a taxon of un- is expressed in naming Platanites willigeri Halamski and certain authorship; coll., collection (referring to an owner, Kvaček sp. nov. in his honour. not necessarily the collector); ICN, International Code of Roemer (1886, 1889) studied fossil plants from the ce- Nomenclature for algae, fungi, and plants; leg. legit (Latin: ramic clays mined in the suburbs of Bolesławiec. He de- collected), indicating the collector; s.n., sine numero (Latin: scribed seven taxa in total, including one new species without number, for a specimen belonging to an established (Menispermites bunzlavensis Roemer, 1889). Unfortunately, collection but lacking an inventory number; ubi syn., ubi only a small part of his collection could be found in MGUWr, synonymia (Latin: where the synonimy [can be found]), for whereas the rest (including types and most of figured speci- a reference containing an extensive synonymy list. mens) seems to be lost. An important collection of plant fossils from the North Sudetic Basin was assembled in the Löwenberger Historical background Gymnasium (secondary school at Lwówek Śląski), at least in part by the teacher and cantor Ernst Friedrich Dresler, If one disregards data on the geology of the area along the author of a local flora (Dresler 1883). These specimens the Kwisa river forming the easternmost extremity of are the basis of lists given by Goeppert (1866a), Williger Lusatia then belonging to the state of Saxony, provided by (1882) and Scupin (1913), but, as mentioned previously, no Charpentier (1778), the earliest geological description of systematic treatment of them has ever been published. The the North Sudetic Basin was given by von Raumer (1819: collection was acquired by
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