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Closterium Thailandicum N Tropical palynofloras from Middle Miocene Chiang Muan basin, Phayao, Thailand Wickanet Songtham1, Benjavun Ratanasthien2 and Dallas C. Mildenhall3 1 Bureau of Geological Survey, Department of Geological Resources, Rama VI Road, Ratchathevee, Bangkok 10400, Thailand 2 Department of Geological Sciences, Faculty of Science, Chiang Mai University, Chiang Mai 50200 Thailand 3 Institute of Geological and Nuclear Sciences, Lower Hutt, P.O. Box 30-368 New Zealand Á¦¼­´µ °¡¦¦Å¤oÁ ¦°µÂ°o Án ¸¥¤nª ´®ª¡³Á¥µ´ ª·Á« ¦¦¦¤1, ÁȪ¦¦ ¦´Á­¸¥¦2 ¨³ Dallas C. Mildenhall3 1 ­Îµ´¦¸ª¥µ· ¦¤¦´¡¥µ¦¦¸ ¡¦³¦µ¤¸É 6 ¦µÁª¸ ¦»Á¡¤®µ¦ 10400 2 £µª·µ¦ª¸ ·¥µ ³ª·¥µ«µ­¦r ¤®µª·¥µ¨´¥Á¸¥Ä®¤n ´®ª´Á¥Ä®¤¸ n 50200 3 Institute of Geological and Nuclear Sciences, Lower Hutt, P.O. Box 30-368 New Zealand ABSTRACT Sporomorphs from sediments of Middle Miocene Chiang Muan basin include abundant Crassoretitriletes vanraadshoovenii, Actinastrum bansaense n. sp., and Closterium thailandicum n. sp., and common Dipterocarpaceae, Lagerstroemia, Ilexpollenites, Botryococcus, Myrtaceidites, and Combretum with rare forms of Florschuetzia, Homonoia, Calophyllum, Striatriletes susannae, and Mimosoideae. There are abundant Laevigatosporites haardtii fern spores in some horizons with various forms of as yet unidentified tricolporate and tricolpate pollen. The sporomorphs, representing tropical palynofloras derived from tropical monsoon forests, accumulated mainly in lacustrine depositional environments. Origins and distributions of the families Dipterocarpaceae and Myrtaceae are discussed and new criteria elucidating their paleophytogeographic histories in relation to northern Thailand are proposed. ´¥n° Á¦¼­´µ °¨³°°Á­¦ ­°¦r ¨³­µ®¦nµ¥µ³°­¤´¥Å¤Ã°¸°¨µµÂ°nÁ¸¥ ¤nªÃÁnoª¥­°¦r ° Crassoretitriletes vanraadshoovenii ­µ®¦nµ¥Êεº Actinastrum bansaense n. sp. ¨³ Closterium thailandicum n. sp. °µ¸Ê¥´¡ Dipterocarpaceae, Lagerstroemia, Ilexpollenites, Botryococcus, Myrtaceidites ¨³ Combretum ÅoÃ¥´ÉªÅ ­nª¸É ¡Á¡¸¥Á¨Èo°¥ÅoÂn Florschuetzia, Homonoia, Calophyllum, Striatriletes susannae ¨³ Mimosoideae ¡­°¦r ° Laevigatosporites haardtii °¥nµ¤µ¤µ¥Äµ´Ê³°¦nª¤´ Á¦¼­´µ°¸®¨µ¥·¸ÉÁ}¦¼Â ° tricolpate ¨³ tricolporate ¹É¥´ª··´¥·Å¤nÅo Á¦¼­´µ´¨nµª¤µµiµÅ¤oÁ ¦o°¦°Ç°nÃ¥­³­¤³°Ä­£µ¡Âª¨o°¤Â¸É ¨»n¤Êε ´Â¨³³Á¨­µÊεº MATERIALS AND METHODS Eighty-two sedimentary samples including claystone and coal were collected from Chiang Muan coal pit totally 120 meters in thickness. Standard acid maceration process was applied to extract sporomorphs from the samples. The light microscopy and scanning electron microscopy were used to investigate and describe the sporomorph morphologies. RESULT Most palynofloras from Chiang Muan sediments contained identifiable tropical elements and abundant freshwater green algae. Three palynological acme zones are defined - Closterium thailandicum Acme Zone, Crassoretitriletes vanraadshoovenii Acme Zone, and Actinastrum bansaense Acme Zone - from the base to the top. 1. Closterium thailandicum Acme Zone, new zone This zone is dominated by the freshwater alga Closterium thailandicum. Some cenobia of the colonial chlorophycean alga Botryococcus and fossil spores Striatriletes susannae (van der Hammen), related to the extant aquatic fern Ceratopteris thalictoides (L.), family Parkeriaceae, also occur. These freshwater elements occur in association with several forms of pollen from predominantly tropical plants, including Calophyllum, Combretum, Florschuetzia, Homonoia, Ilexpollenites, Lagerstroemia, and Mimosaceae. This zone reflects a freshwater depositional environment surrounded by tropical rainforests. The climate was tropical. 2. Crassoretitriletes vanraadshoovenii Acme Zone, new zone This zone is dominated by Crassoretitriletes vanraadshoovenii, the ancestral spores of the extant fern Lygodium microphyllum Link., with several forms of tropical pollen. These include cf. Bauhinia, Calophyllum, Combretum, Homonoia, Hopea, Ilexpollenites, Lagerstroemia, Myrtaceidites (Myrtaceae), cf. Shorea with abundant Laevigatosporites haardtii R. Pot. et Venitz spores, of uncertain, but probably mixed botanical affinity, in some horizons. The pollen and spore assemblages from this zone come from tropical rainforests. Climate during deposition was tropical. 3. Actinastrum bansaense Acme Zone, new zone This zone contains almost entirely cells from the freshwater alga Actinastrum bansaense. Pollen and spores are absent but some indeterminate fungal spores are present. This zone is interpreted as an ancient freshwater lake. The abundant occurrence of freshwater algae probably resulted from algal bloom events during sedimentation of the overburden, but why spores and pollen are not preserved is not known unless they were differentially oxidized out of the sediment or completely overwhelmed by the abundance of algal material. DISCUSSION Chiang Muan sediments yielded some distinctive sporomorph forms representing tropical megathermal floras dominated by members of the family Dipterocarpaceae. The origin and distribution through time of this family has often been debated. Dipterocarps today have their greatest diversity in Southeast Asian rain forests. They also occur in some parts of India and Sri Lanka. Two genera, Marquesia and Monotes, occur in tropical Africa (Bancroft, 1933, 1935), and one genus, Pakaramaea, occurs in northern South America (Morley 2000). Morley (2000) maintained that the family did not originate in Southeast Asia, but in either South America or Africa and that their descendants have not substantially changed their paleoecological preferences. However, a new revision was recently made placing African and American dipterocarps into a new family, Monotaceae, comprising two subfamilies Monotoideae (Monotes and Marquesia) and Pakaramaeoideae (Pakaramaea). Therefore, dipterocarps (senso stricto) today survive just in the western region of Wallace’s line including western Indonesia, the Melasian archipelagoes, Southeast Asian mainland, India and Sri Lanka. Monotes is characterized by endoapertures meanwhile Dipterocarpaceae is tricolpate. On the basis of aperture characteristics, it is believed that Dipterocarpaceae is more primitive than the Monotes. Dipterocarps were clearly extensively represented in the monsoon forests of the Sunda region during the Late Oligocene and Early Miocene (Morley, 2000). Meanwhile, dipterocarps first appeared in India during Neogene (Lakhanpal and Guleria, 1987; Prasad and Prakash, 1987; Antal and Awasthi, 1993; Prasad, 1993, 1994) and without any record of dipterocarps from the Paleogene of India (Antal and Prasad, 1996). Thus it is possible that the family originated in Southeast Asia and later expanded to India via Thailand and Myanmar sometime in the Early Miocene which was previously proposed by Antal and Prasad (1996). The occurrence of dipterocarpaceous pollen, Hopea and cf. Shorea, from the Middle Miocene Chiang Muan sediments reveals that the dipterocarp vegetation developed under a tropical monsoon climate. Myrtaceidites is also an important fossil sporomorph with a distinctive morphology found primarily in the family Myrtaceae, making it easy to tracing the family’s origin and distribution through time. Chaimanee and others (2003) reported abundant fossil Myrtaceae pollen from Chiang Muan sediments, which they related to Syzygium, and claimed that the dominance of this pollen type and the swampy environment indicated a dispersal corridor to Africa. Myrtaceae is a family of trees and shrubs found in the tropics, subtropics, Polynesia, and temperate Australia and New Zealand comprising 140 genera and 3000 species and including the well known gum tree, eucalyptus. Syzygium is native to Australia, New Zealand and elsewhere, as well as Southeast Asia including Thailand. There are many native species of Syzygium reported from northern Thailand (Gardner and others, 2000) including the Chiang Muan area. Accordingly, there is no reason to regard these Syzygium-like sporomorphs from Chiang Muan sediments as indicating an African connection. In addition, most myrtaceous pollen from Tertiary sediments have been identified only at the family level and assigned the fossil form generic name Myrtaceidites, and it appears impossible to accurately determine botanical affinity to the generic level in many cases (Martin, 1978). Use of the scanning electron microscope to accurately identify the botanical affinity of myrtaceous fossil pollen is possible in some cases and probably impossible in others where the pollen morphology of the family is so conservative and the pollen grains so small. Some species of Syzygium are distinctive in that this pollen type often has a more triangular appearance in polar view with more acute angles and an ectexinous polar island reduced to scabrae and granules (McIntyre, 1963 [as Eugenia]; Martin, 1978) than other myrtaceous grains. It is not known when Myrtaceae first appeared in Thailand but it is at least Early Miocene (Watanasak, 1988). The first appearance of Myrtaceae pollen types in Australia and New Zealand in the Paleocene (Stover and Partridge, 1973; Mildenhall, 1980; Raine, 1984) probably represents its worldwide first appearance. Therefore, the presence of this Gondwanan family in northern Thailand in the Miocene may relate to the tectonic movement of the Indian subcontinent. India used to be a part of Gondwana, together with Australia, and broke up when it moved northward acting as a Noah’s ark (Morley, 2000) carrying the southern fauna and flora, including the Myrtaceae, northward. India collided and welded onto South Asia during the Eocene
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