陕北横山晚三叠世造迹鱼类恢复

王丽芳; 卢宗盛; 龚道好; 陈斌; 李富强

陕北横山晚三叠世造迹鱼类恢复

1.
中国地质大学研究生院, 湖北武汉 430074
2.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

国家自然科学基金项目 49972086

国家自然科学基金项目 40372011

CNPC储层重点实验室“陆相沉积遗迹组构研究及其在高分辨率层序地层分析中应用”项目 200033

详细信息

作者简介:
王丽芳(1982-), 女, 硕士研究生, 研究方向为古生物学、沉积地质学.E-mail: lfwang11@163.com

中图分类号: Q915
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出版历程
- 刊出日期: 2008-02-25

Restoration of Late Triassic Fish Trace Makers in Hengshan County, Shaanxi Province, China

1.
Graduate School, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 运用遗迹化石恢复造迹动物的形态结构是古遗迹学研究的难点.近年来在陕北横山晚三叠世地层中发现大量完好的鱼类游泳遗迹, 能较好地恢复造迹鱼类鳍的着生位置及相关形态结构, 确定造迹鱼的类型.通过游泳遗迹的形态结构与鱼类形态结构相互关系的分析, 建立了游泳遗迹形态结构参数与造迹鱼类形态结构参数之间的数学关系式.通过计算显示同一遗迹种的鱼鳍间距与鱼体长度比值一定, 这与现代鱼类形体特征一致.应用该方法恢复了研究区两遗迹种的造迹鱼类, 其中Undichna britannica造迹鱼类的尾鳍和臀鳍间距与体长之比为0.3, 臀鳍和胸鳍间距与体长之比为0.45~0.5, 尾鳍和腹鳍间距与体长之比为0.49~0.5, 与邻区相同层位发现的鱼类实体化石Wayaobulepis zichangensis相关特征一致.另一遗迹种Undichna tricosta恢复的尾鳍和臀鳍间距与体长之比约为0.35, 可能与本区相同层位发现的Saurichthys huanshenensis特征相似.
- 遗迹化石 /
- 鱼类 /
- 游泳遗迹 /
- 晚三叠世 /
- 陕西北部
Abstract: It is a palaeoichnological puzzle to restore the biological morphology of the trails makers by analyzing trace fossils. Many intact fish swimming trail fossils, which can reflect some biologic features of the trace-maker fish, such as body length, distribution of fish fins, shape and structure of fish fins, have been unearthed recent years from the Late Triassic of Hengshan County, Shaanxi Province. The mathematical formulations based on the analysis of the relationship between the morphological feature parameters of trace and trace producers indicate that, the certain ratio of the distance of fish fins and body length is consistent with that of modern fish. The result of the calculation of the data from fish swimming traces shows that, the trace Undichna britannica was made by these fishes, whose distance between caudal fin and anal fin is 0. 3 of the body length, the distance between anal fin and pectoral fins is 0. 5 of the body length, and the distance between caudal fin and ventral fins is between 0. 49-0. 5 of the body length. These features are consistent with the those of a fossil fish, named Wayaobulepis zichangensia sp. nov. in the stratum in close proximity to the trace fossil. The ratio of the distance between caudal fin and anal fin, resulted from the other trace Undichna tricosta, is about 0. 35, which is similar with the features of the fossil fish named Saurichthys huanshenensis in the same stratum.
- trace fossil /
- fish swimming trails /
- Late Triassic /
- northern Shaanxi /

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图 1 陕北横山晚三叠世4种鱼类游泳遗迹（据卢宗盛和陈斌, 1998；卢宗盛等, 2003a, 2003b；Lu et al., 2004资料综合）

（a）Undichna britannica；（b）U.tricosta；（c）U.prava；（d）U.bina；Ct.尾鳍刻画的波线；At.臀鳍刻画的波线；Vt.腹鳍刻画的波线；Pt.胸鳍拖拽痕；Am.腹部突起物拖拽痕

Fig. 1. Four kinds of fish swimming trails in Late T riassic of Hengshan, Shaanxi Province, China

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图 2 新采集的鱼类游泳遗迹(标本采自卢宗盛和陈斌(1998)文献中庙沟剖面第7层)

a.Undichna tricosta标本号：05W-1；b. U. britannica标本号：05W-2(B, C)

Fig. 2. Fish swimming trails collected recently

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图 3 鱼体运动部位划分

P.胸鳍; V.腹鳍; A.臀鳍; C.尾鳍；LI.尾部；L2.躯干部

Fig. 3. The division of movement section on fish body

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图 4 鱼鳍着生位置与遗迹参数的几何关系

a.鱼游泳时，鳍相对位置图解; b.尾鳍与臀鳍位置关系图解；c.臀鳍与腹鳍位置关系图解；d.鱼类游泳迹波线相位差与鳍位差关系示意图.C、A、V、P分别为尾、臀、腹、胸鳍的触底点；A_C、A_A、A_V、A_P分别为尾、臀、腹、胸鳍刻画波线的振幅；ΔS_CA、ΔS_AV、ΔS_VP分别为尾鳍与臀鳍、臀鳍与腹鳍、腹鳍与胸鳍间距在遗迹中轴线方向上的投影长度，本文称其为鳍位差；φ为尾部摆角，ψ为躯干部摆角；L_CA、L_AV分别为尾鳍与臀鳍、臀鳍与腹鳍的间距；Ct.尾鳍刻画的波线；At.臀鳍刻画的波线; Vc.腹鳍刻画的平行双波线的中迹线; Pc. —对近平行的胸鳍拖拽痕的中迹线；ω_CA、ω_AV、ω_VP、ω_AP分别为尾鳍与臀鳍、臀鳍与腹鳍、腹鳍与胸鳍、臀鳍与胸鳍、波线间的相位差

Fig. 4. Geometric relationship between the location of fins and trace parameters

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图 5 遗迹化石Undichna britannica恢复的鱼体特征与实体化石量度的鱼体特征对比

▲由遗迹U.britannica计算的尾鳍和臀鳍间距与体长之比；●由遗迹U. britannica计算的臀鳍和胸鳍间距与体长之比；+由遗迹U. tricosta计算的尾鳍和腹鳍间距与体长之比；△实体化石Wayaobulep is z ichangensis量度的尾鳍与臀鳍间距与体长之比；O陕北相同层位发现的实体化石Wayaobulepis zichangensis量度的臀鳍和胸鳍间距与体长之比

Fig. 5. Features comparison between fish body restored by trace fossils and fish body measured by substantial fossils Undichna britannica

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图 6 造迹鱼类部分形体特征复原及与邻区同层位实体化石对比

(a)由遗迹Undichna britannica恢复的造迹鱼类；(b)实体化石Wayaobulepis zichangensis的复原图(据苏德造，1999)；(c)由遗迹Undichna tricosta恢复的造迹鱼类

Fig. 6. The restoration of the building-trace fish body features and the comparison with the substantial fish fossil in the same age

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表 1 遗迹标本测量数据及计算的鱼体特征（单位：cm）

Table 1. Measurement data of trace fossils and the calculation of fish-body features

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