CAJ | 학술논문

化石采自甘肃省兰州盆地咸水河组底部, 经研究认为有29种, 归属20属12科。它们是：樟科Lauraceae (Daphnogene), 木通科Lardizabalaceae (Akebia), 小檗科Berberidaceae (Berberis), 榆科Ulmaceae (Planera, Ulmus, Zelkova),桦木科Betulaceae (Alnus,Carpinus),杨梅科 Myricaceae(Myrica),杨柳科Salicaceae (Populus,Salix),紫金牛科Myrsinaceae(Ardisia),蔷薇科Rosaceae (Prunus, Sorbus, Sorbaria, Spiraea),豆科 Leguminosae (Gleditsia, Sophora),漆树科 Anacardiaceae (Rhus),忍冬科Caprifoliaceae(Viburnum)等。经植物区系组成与叶相分析显示, 该植物区系的大多数成员是落叶阔叶乔、灌木, 少数为常绿灌木。其中特殊的分子是Rhus turcomanica Korov. ex Vassilvesk, 该成分是早第三纪中、晚期的标志化石植物。另一化石植物Sorbaria callicomifolia Kornilova 曾出现在中亚的早渐新世, 最晚至早中新世。同一层位采集的孢粉样分析结果显示：该组合仅约20种, 种类相对贫乏, 并以被子植物的花粉占优势。其中出现裸子植物的麻黄粉, 被子植物的白刺粉及蒿粉等, 这几个类型均指示沉积时期经历干旱气候。综合植物大化石及孢粉分析研究, 均出现一些指示气候为亚热带干旱或周期性干旱气候的特点, 并据Rhus turcomanica出现的最晚记录, 推测咸水河组底部的地质时代大约是早渐新世晚期。
화석채자감숙성란주분지함수하조저부, 경연구인위유29충, 귀속20속12과。타문시：장과Lauraceae (Daphnogene), 목통과Lardizabalaceae (Akebia), 소벽과Berberidaceae (Berberis), 유과Ulmaceae (Planera, Ulmus, Zelkova),화목과Betulaceae (Alnus,Carpinus),양매과 Myricaceae(Myrica),양류과Salicaceae (Populus,Salix),자금우과Myrsinaceae(Ardisia),장미과Rosaceae (Prunus, Sorbus, Sorbaria, Spiraea),두과 Leguminosae (Gleditsia, Sophora),칠수과 Anacardiaceae (Rhus),인동과Caprifoliaceae(Viburnum)등。경식물구계조성여협상분석현시, 해식물구계적대다수성원시락협활협교、관목, 소수위상록관목。기중특수적분자시Rhus turcomanica Korov. ex Vassilvesk, 해성분시조제삼기중、만기적표지화석식물。령일화석식물Sorbaria callicomifolia Kornilova 증출현재중아적조점신세, 최만지조중신세。동일층위채집적포분양분석결과현시：해조합부약20충, 충류상대빈핍, 병이피자식물적화분점우세。기중출현라자식물적마황분, 피자식물적백자분급호분등, 저궤개류형균지시침적시기경력간한기후。종합식물대화석급포분분석연구, 균출현일사지시기후위아열대간한혹주기성간한기후적특점, 병거Rhus turcomanica출현적최만기록, 추측함수하조저부적지질시대대약시조점신세만기。
Fossil plants from the lower part of Xianshuihe Formation in the Lanzhou Basin, Gansu Province were studied. The flora contains 29 species, representing 20 genera and 12 families, which include Lauraceae (Daphnogene), Lardizabalaceae (Akebia), Berberidaceae (Berberis), Ulmaceae (Planera, Ulmus, Zelkova), Betulaceae (Alnus,Carpinus), Myricaceae(Myrica), Salicaceae (Populus,Salix), Myrsinaceae(Ardisia), Rosaceae (Prunus, Sorbus, Sorbaria, Spiraea), Leguminosae (Gleditsia, Sophora), Anacardiaceae (Rhus), Caprifoliaceae(Viburnum). An analysis of the floristic elements and their foliar physiognomy shows that most members of the flora are deciduous broad-leaved trees or shrubs with a few evergreen shrubs. The most noteworthy species is Rhus turcomanica which was present in the Middle Eocene to Late Eocene of Central Asia (Kazakhstan, Turkmenistan). Generally, Rhus turcomanica occurred at the same beds as Palibinia, an extinct fossil plant whose presence indicates a subtropical dry climate. Another species, Sorbaria callicomifolia Kornilova was present from the Early Oligocene to Early Miocene of Central Asia (Kazakhstan and Turkmenistan). According to an analysis of spores and pollen, this flora contains over 20 species. It is predominated by the angiosperm pollen. There appeared Ephedripites and Nitrariadites which were important elements in the dry area. Ephedripites was found from the Upper Cretaceous to Early Tertiary. Nitrariadites occurred in the Late Miocene, whereas Rhus turcomanica and Sorbaria callicomifolia were both reported in the subtropical dry area from the Middle Eocene to Early Oligocene. The latest record of Rhus turcomanica is from the Middle Eocene to Early Oligocene of Central Asia. The presence of this element in the lower part of Xianshuihe Formation may indicate that its age is the latest stage of the Early Oligocene.