New Occurrence and Significance of Middle Triassic Luoping Biota from Luxi County, Yunnan Province
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摘要: 罗平生物群是我国著名的三叠纪海相生物群，时代为中三叠世安尼期Pelsonian亚期，主要分布在云南罗平县城周围大洼子、九光村等地.在泸西地区中三叠统关岭组二段发现了海生爬行类、鱼类、节肢动物、棘皮动物、软体动物、腕足动物、植物等罗平生物群化石类型，初步研究显示泸西地区罗平生物群化石构成面貌与罗平基本一致，但新发现的盾鳞化石是罗平生物群层位软骨鱼类的首次报道.在泸西白水塘中三叠统关岭组二段剖面中识别出了Nicoraella germanicus、Nicoraella cf.kockeli和Neogondolella? bifurcata等牙形石类型，构成面貌特征表明其归属于中三叠世安尼期Pelsonian亚期，与罗平地区地层时代相当.泸西地区罗平生物群化石的发现扩大了罗平生物群的分布范围，其中新发现的盾鳞化石为研究华南中三叠世软骨鱼类提供了新材料.Abstract: The Luoping Biota is a famous Triassic marine fossil Lagerstätten in the world, and its age is assigned to Pelsonian, Anisian, Middle Triassic. Previously the fossils of the Luoping Biota were reported only from the area around the Dawazi, Jiuguang villages in the Luoping County. Here it reports the discovery of abundant fossils, including marine reptiles, fishes, athropods, echinoderms, mollusks and plants from Member Ⅱ of the Guanling Formation in Luxi County, Yunnan Province. The fossil assemblage in Luxi County is similar to that of the Luoping Biota. However, the placoid scales found in Luxi represent the first report of Chondrichthyes from the Luoping Biota. Conodont Nicoraella germanicus, Nicoraella cf. kockeli and Neogondolella? bifurcate, were recognized from the Baishuitang section, indicating an age of Plesonian, Anisian, Middle Triassic, which is equal to that of Luoping Biota. The fossil locality found in Luxi is of great significance in understanding the spatial distribution of the Luoping Biota. This work also provides new materials for studying the Middle Triassic Chondrichthyes in South China.
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Key words:
- Middle Triassic /
- conodont /
- placoid scale /
- Luoping Biota /
- Luxi County /
- paleontology
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图 2 滇黔桂地区中三叠世安尼期岩相古地理背景
据冯增昭等（1997）和孙媛媛等（2009）修改. 1.康滇古陆；2.滨岸；3.台地相；4.局限台盆；5.斜坡；6.南盘江盆地
Fig. 2. The paleogeography map of Middle Triassic (Anisian) in the neighboring area of Yunnan, Guizhou and Guangxi
图 3 泸西白水塘剖面层序地层划分及化石分布
HST.高位体系域；TST.海侵体系域；SB2.Ⅱ型层序界面；CS.凝缩段；mfs.最大海泛面；OP.开阔台地；RP.局限台地；IPB.局限台盆
Fig. 3. Sequence stratigraphy classification and fossil distribution of the Baishuitang section, Luxi County
图 4 白水塘剖面层序界面
a.第37层包卷层理；b. 36~37层最大海泛面; c.第47层顶部层序界面；d.第54层纹层状泥晶灰岩
Fig. 4. Sequence boundary of the Baishuitang section
图 5 白水塘剖面36层牙形石
a.德国尼古拉刺，右侧视；b.科克尔尼古拉刺相似种，右侧视.图中比例尺为200 μm
Fig. 5. Conodonts in bed 36 of Baishuitang section
图 6 泸西地区罗平生物群典型分子
a.巴拉顿菊石未定种Balatonites sp.，右侧视；b.小型中华龙鱼，右侧视；c.新鳍鱼类，右侧视；d.玉带鱼未定种，左侧视；e.泸西伊吉虾，左侧视；f.白氏原双节虫，右侧视；g.混鱼龙，左侧视；h.幻龙，右侧视；i.肋鳞鱼未定种，左侧视；j.海百合茎；k.褶翅蛤未定种Myophoria sp.；l.舌形贝未定种Lingula sp.；m.粪化石
Fig. 6. Typical fossils from Luxi County
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