Abstract
Vase-shaped microfossils (VSMs) described herein mainly occur as isolated individuals in thin bedded siltstone and silty carbonate of the Gaojiashan Member of the upper Ediacaran Dengying Formation (ca. 551–541 Ma). Although these fossils are abundant, chained tests or other types of colonial aggregates have not been observed. Specimens in the siltstones can easily be isolated from the host rocks by ultrasonic vibrators. Compared with the co-occurring fossils Gaojiashania and Conotubus, VSMs are rarely pyritized, yet they are always three-dimensionally persevered with little deformation, suggesting that their tests were sturdy and possibly mineralized. Petrological observation and elemental mapping reveal two types of tests that are respectively calcareous and siliceous in composition. Calcareous tests typically consist of two to three crypto-crystal laminae, somewhat resembling bilamellar walls of foraminifers. Siliceous tests consist of fine-grained particles agglutinated with siliceous cement, similar to agglutinated walls of foraminifers. The Gaojiashan VSMs are broadly similar, at least in gross morphology, to the testate amoebae-like VSMs, but their relative large sizes (600–2400 μm) and possibly mineralized (rather than organic) tests argue against this comparison. They also show some similarities to other protozoans, especially tintinnids. However, tintinnids have robust pesudochitinous loricae consisting of both secreted and agglutinated materials. Moreover, tintinnid loricae differ in shape from the Gaojiashan VSM tests in having a constricted aboral end (sometimes with a caudal appendix) and a flaring oral opening. If the Gaojiashan VSMs are indeed related to foraminifers, they indicate that foraminifers were important players in late Ediacaran communities.
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References
Gaucher C, Sprechermann P. Upper Vendian skeletal fauna of the Arroyo del Sodado Group, Uruguay. Beringeria, 1999, 23: 55–91
Culver S J. Early Cambrian foraminifera from West Africa. Science, 1991, 254: 689–691
McIlroy D, Green O R, Brasier M D. Palaeobiology and evolution of the earliest agglutinated Foraminifera: Platysolenites, Spirosolenites and related forms. Lethaia, 2001, 34: 13–29
Lipps J H, Rozanov A Y. The Late Precambrian-Cambrian agglutinated fossil Platysolenites. Palaeontol J, 1996, 10: 687–697
Knoll A H, Vidal G. Late Proterozoic vase-shaped microfossils from the Visingsö Beds, Sweden. Geol Föreningen Stockholm Förhandl, 1980, 102: 207–211
Porter S M, Knoll A H. Testate amoebae in the Neoproterozoic Era: Evidence from vase-shaped microfossils in the Chuar Group, Grand Canyon. Paleobiology, 2000, 26: 360–385
Bloeser B, Schopf J W, Horodyski R J, et al. Chitinozoans from the Late Precambrian Chuar Group of the Grand Canyon, Arizona. Science, 1977, 195: 676–679
Bloeser B. Melanocyrillium, a new genus of structurally complex Late Proterozoic microfossils from the Kwagunt Formation (Chuar Group), Grand Canyon, Arizona. J Paleontol, 1985, 59: 741–765
Horodyski R J. A new occurrence of the vase-shaped fossil Melanocyrillium and new data on this relatively complex Late Precambrian fossil. Geol Soc Amer Abstr Programs, 1987, 19: 707
Horodyski R J. Paleontology of Proterozoic shales and mudstones: Examples from the Belt Supergroup, Chuar Group and Pahrump Group, western USA. In: Nagy B, Leventhal J S, Grant R F, eds. Metalliferous Black Shales and Related Ore Deposits. Precambrian Res, 1993, 61: 241–278
Knoll A H, Calder S. Microbiotas of the late Precambrian Ryssö Formation, Nordaustlandet, Svalbard. Palaeontology, 1983, 26: 467–496
Porter S M, Meisterfeld R, Knoll A H. Vase-shaped microfossils from the Neoproterozoic Chuar Group, Grand Canyon: A classification guided by modern testate amoebae. J Paleontol, 2003, 77: 409–429
Yin L M. Late Precambrian microfossils from Diaoyutai Formation, Eastern Liaoning, China. Paper for the 5th International Conference. Nanjing: Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 1980. 18
Zang W L, Walter M R. Late Proterozoic and Early Cambrian microfossils and biostratigraphy, northern Anhui and Jiangsu, centraleastern China. Precambrian Res, 1992, 57: 243–323
Duan C H, Cao F. New discovery of vase-like fossils from Eastern Yangtze Gorges, Hubei. Period Tianjin Institute Geol Mineral Resources, 1989, (21): 130–147
Wu X H, Wang S Y. Possible phosphatized protozoan fossils from the late Neoproterozoic Doushantuo phosphorites in Guizhou Province. Acta Micropalaentol Sin, 2004, 21: 194–198
Li Y, Guo J F, Zhang X L, et al. Vase-shaped microfossils from the Ediacaran Weng’an biota, Guizhou, South China. Gondwana Res, 2008, 14: 263–268
Ren C Y, Liu L Q, Zhou Y H, et al. Vase-shaped Microfossils from Weng’an Biota. J Earth Sci Environment, 2008, 30: 249–252
Zhang L Y, Li Y. The Late Sinian vasiform microfossils of Ningqiang, Shaanxi Province. Period Xi’an Institute Geol Min Resources, 1991, (31): 77–86
Zhang L Y. A new progress in research on vase-shaped microfossils from the Dengying Formation of Sinian in southern Shaanxi Province. Acta Geol Gansu, 1994, 3: 1–8
Xue Y S, Zhou C M, Tang T F. New material of animal fossils from the Upper Sinian of the Yangtze Region, southern China. Acta Palaeontol Sin, 2002, 41: 137–141
Duan C H, Cao F, Zhang L Y. Vase-shaped microfossils from top of the Dengying Formation in Xixiang, Shaanxi. Acta Micropalaeontol Sin, 1993, 10: 397–408
Cao F, Duan C H, Zhang L Y. The discovery and significance of the vase-shaped microfossils in Meishucunian stage in Ningqiang, Shaanxi. Geol Rev, 1995, 41: 355–362
Cao F. Study on the vase-shaped microfossils in China. Acta Micropalaeontol Sin, 1998, 15: 404–416
Zhang Z Y. Comments on the “Vase-shaped microfossils“ from the Doushantuo Formation of the eastern Yangtze Gorges. Acta Micropalaeontol Sin, 1994, 11: 369–371
Qian Y, Zhang S B. Small shelly fossils from the Xihaoping Member of the Dongying Formation in Fangxian county of Hubei Province and their stratigraphic significance. Acta Palaeontol Sin, 1983, 22: 82–94
Duan C H. Vase-like fossils of Precambrian in Hubei, Fangxian. Period Tianjin Institute Geol Mineral Resources, 1986, (13): 87–120
Geng L Y, Zhang S B. Early Cambrian problematic fossils from Fangxian, Hubei, China. In: Stratigraphy and Paleontology of Systemic Boundaries in China. Precambrian-Cambrian Boundary (1). Nanjing: Nanjing University Publishing House, 1977. 523–536
Zhao Z Q, Xing Y S, Ding Q X, et al. The Sinian System of Hubei. Wuhan: China University of Geosciences Press, 1988. 1–205
Qian Y, Sun W G, He D G, et al. Restudy on “vase-shaped microfossils“ from the Lower Cambrian Xihaoping Member in south Shaanxi and west Hubei. Acta Micropalaeontol Sin, 2000, 17: 317–326
Zhang L Y. A discovery and preliminary study of the Late Sinian stage Gaojiashan Biota from Ningqiang county, Shaanxi. Bull Xi’an Institute Geol Mineral Res Chin Acad Geol Sci, 1986, 13: 67–88
Cai Y, Hua H, Xiao S, et al. Biostratinomy of the late Ediacaran pyritized Gaojiashan Lagerstätte from southern Shaanxi, South China: Importance of event deposits. Palaios, 2010, 25: 487–506
Vénéc-Peyré M T, Jaeschke-boyer H. Application de la microsonde moléculaire à laser à Pétude du test de quelques Foraninifères cslcaires. Copt Rend Acad Sci Paris-Sér D, 1978, 287: 607–609
Milliken K L, Choh S J, Papazis P, et al. “Cherty” stringers in the Barnett Shale are agglutinated foraminifera. Sediment Geol, 2007, 198: 221–232
Schieber J. Discovery of agglutinated benthic foraminifera in Devonian black shales and their relevance for the redox state of ancient seas. Palaeogeogr Palaeocl Palaeoecol, 2009, 271: 292–300
Miller W III. Giant bathysiphon (Foraminiferida) from Cretaceous turbidites, Northern California. Lethaia, 1988, 21: 363–374
Streng M, Babcock L E, Hollingsworth J S. Agglutinated protists from the Lower Cambrian Nevada. J Paleontol, 2005, 79: 1214–1218
Hansen H J. Test structure and evolution in the Foraminifera. Lethaia, 1977, 122: 173–182
Pawlowski J, Holzmann M, Berney C. The evolution of early Foraminifera. Proc Natl Acad Sci, 2003, 100: 11494–11498
Langer M R. Origin of foraminifera: Conflicting molecular and paleontological data? Mar Micropaleontol, 1999, 38: 1–5
Flügel E. Microfacies of Carbonate Rocks—Analysis, Interpretation and Application. Berlin: Springer, 2004. 976
Marszalek D S. Calcisphere ultrastructure and skeletal aragonite from the alga Acetabularia antillana. J Sediment Petrol, 1975, 45: 266–271
Samtleben C, Munnecke A, Bickert T, et al. Shell construction, assemblage and species dependent effects on the C/O-isotopic composition of brachiopods—Examples from the Silurian of Gotland. Chem Geol, 2001, 175: 61–107
Kazmierczak J. Volvocacean nature of some Paleozoic nonradiosphaerid calcispheres and parathuramminid “foraminifera”. Acta Paleontol Pol, 1976, 10: 73–85
Kazmierczak J, Ittekkot V, Degens E T. Biocalcification through time: Environmental challenge and cellular response. Paläontol Zeitschrift, 1985, 59: 15–33
Ausich W I, Bottjer D J. Sessile invertebrates. In: Briggs D E G, Crowther P R, eds. Palaeobiology II. Oxford: Blackwell, 2001. 384–386
Clapham M E, Narbonne G M. Ediacaran epifaunal tiering. Geology, 2002, 30: 627–630
Yuan X, Xiao S X, Parsley R L, et al. Towering sponges in an Early Cambrian Lagerstätte: Disparity between non-bilaterian and bilaterian epifaunal tiers during the Neoproterozoic-Cambrian transition. Geology, 2002, 30: 363–366
Clapham M E, Narbonne G M, Gehling J G. Paleoecology of the oldest known animal communities: Ediacaran assemblages at Mistaken Point, Newfoundland. Paleobiology, 2003, 29: 527–544
Vermeij G J. Evolution and Escalation. Princeton: Princeton University Press, 1987
Bengtson S, Yue Z. Predatorial borings in late Precambrian mineralized exoskeletons. Science, 1992, 257: 367–369
Hua H, Pratt B R, Zhang L Y. Borings in Cloudina shells: Complex predator-prey dynamics in the terminal Neoproterozoic. Palaios, 2003, 18: 454–459
Van Cappellen P. Biomineralization and global biogeochemical cycles. Rev Mineral Geochem, 2003, 54: 357–381
Westbroek P, Brown C W, Bleijswijk J V, et al. A model system approach to biological climate forcing: The example of Emiliania huxleyi. Global Planet Change, 1993, 8: 27–46
Bengtson S, Conway M S. Early radiation of biomineralizing phyla. In: Lipps J H, Signor P W, eds. Origin and Early Evolution of Metazoa. New York: Plenum Press, 1992. 447–481
Bengtson S. Mineralized skeletons and early animal evolution. In: Briggs D E G, ed. Evolving Form and Function: Fossils and Development. New Haven, CT: Yale Peabody Museum Publications, 2005. 101–124
Grant S W F. Shell structure and distribution of Cloudina, a potential index fossil for the terminal Proterozoic. Am J Sci, 1990, 290-A: 261–294
Amthor J E, Grotzinger J P, Schröder S, et al. Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman. Geology, 2003, 31: 431–434
Hua H, Chen Z, Yuan X, et al. Skeletogenesis and asexual reproduction in the earliest biomineralizing animal Cloudina. Geology, 2005, 33: 277–280
Hua H, Chen Z, Yuan X. The advent of mineralized skeletons in Neoproterozoic Metazoa: New fossil evidence from the Gaojiashan Fauna. Geol J, 2007, 42: 263–279
Bowring S A, Grotzinger J P, Condon D J, et al. Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman. Am J Sci, 2007, 307: 1097–1145
Francis A M, Cohen P A, Dudás F Ö, et al. Early Neoproterozoic scale microfossils in the Lower Tindir Group of Alaska and the Yukon Territory. Geology, 2010, 38: 143–146
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Hua, H., Chen, Z., Yuan, X. et al. The earliest Foraminifera from southern Shaanxi, China. Sci. China Earth Sci. 53, 1756–1764 (2010). https://doi.org/10.1007/s11430-010-4085-x
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DOI: https://doi.org/10.1007/s11430-010-4085-x