The discovery of dinosaurs from the Middle Jurassic Xintiangou Formation in Xinjin Township Yunyang Chongqing and its sedimentary environment
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摘要:
在重庆市云阳县新津乡中侏罗统新田沟组中发现了大量恐龙化石，且恐龙化石产出层位呈现出与双壳类、鱼类、龟鳖类和蛇颈龙类化石整体混杂埋藏的特征，这是新田沟组中首次发现。通过野外实测剖面、岩石特征、沉积构造、古生物特征、粒度特征，初步判定研究区新田沟组为滨-浅湖亚相沉积，局部为洪泛亚相。重庆地区新田沟组古生物化石组合的首次发现为四川盆地中生代古生物化石及其古环境的研究提供了更多依据。
Abstract:Recently, a large number of dinosaur fossils were found in the Middle Jurassic Xintiangou Formation in Xinjin Township, Yunyang County, Chongqing, and the dinosaur fossils were intermixed with fishes, turtles, plesiosaurs and bivalves.This is the first discovery in the Xintiangou Formation.The Xintiangou Formation in the study area is preliminarily determined to be a littoral-shallow lake subfacies and partly a flood-pan subfacies, as shown by field measured section, rock features, sedimentary structure, paleontological features and grain size characteristics.The discovery of the fossil assemblage of Xintiangou Formation in Chongqing area provides more evidence for the study of Mesozoic fossil and paleoenvironment in the Sichuan basin.
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Key words:
- Chongqing /
- Middle Jurassic /
- Xintiangou Formation /
- dinosaur /
- sedimentary environment
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表 1 生物生存环境统计结果
Table 1. Statistic table of living environment of organisms
生物类别 陆地 沼泽 滨岸
(河滩、湖滨)浅水
(河、湖)鱼类[23] √ 龟鳖类 √ √ √ 蛇颈龙类 √ 恐龙类 √ 双壳类 √ 叶肢介 √ 植物化石类 √ √ 
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表 2 新田沟组样品粒度测量结果
Table 2. Table of particle size measurement results of the Xintiangou Formation samples
样品号 岩性 平均值Mz 标准偏差σ 偏度SK 峰度K Y1 Y2 YP01-04-B1b1 细砂岩 2.62 0.53 0.08 1.02 79.79 -2.06 YP01-09-B1b1 中砂岩 1.31 0.44 -0.02 1.10 53.22 -1.17 YP01-10-B1b1 极细砂岩 3.34 1.23 0.39 3.34 220.56 -14.05 YP01-12-B1b1 粗砂岩 0.42 0.42 0.01 1.06 37.96 -1.42 YP01-13-B1b1 粗砂质中砂岩 1.25 0.49 0.01 1.08 55.51 -1.74 YP01-14-B1b1 极细砂细砂岩 3.01 1.29 0.36 3.54 228.49 -15.31 YP01-15-B1b1 极细砂岩 3.67 1.21 0.40 3.47 225.11 -13.57 YP01-16-B1b1 中砂岩 1.79 1.47 0.45 4.38 259.21 -20.41 YP01-17-B1b1 极细砂岩 3.22 0.60 0.14 1.09 96.77 -2.87 YP01-19-B1b1 粗砂质中砂岩 1.18 0.40 0.12 1.11 51.70 -1.60 YP01-20-B1b1 极细砂岩 3.61 1.30 0.37 4.06 249.39 -15.39 YP01-21-B1b1 细砂质中砂岩 1.97 1.34 0.43 4.86 246.54 -17.04 YP01-22-B1b1 粗砂质中砂岩 1.19 0.41 0.10 1.04 50.73 -1.57 YP01-23-B1b1 极细砂岩 3.49 1.22 0.44 3.64 227.76 -14.02 YP01-24-B1b1 不等粒砂岩 5.09 2.43 0.60 1.98 515.19 -53.12 YP01-26-B1b1 中砂岩 1.47 0.45 0.11 1.23 61.07 -1.83 YP01-27-B1b1 细砂质中砂岩 1.77 1.49 0.47 3.32 243.53 -21.08 YP01-28-B2b2(1) 中砂岩 1.58 0.51 0.06 1.15 64.19 -2.07 YP01-28-B2b2(2) 中砂岩 1.73 0.50 0.19 1.12 67.67 -2.57 YP01-29-B1b1 极细砂岩 3.41 0.56 0.09 1.17 97.27 -2.16 YP01-30-B1b1 细纱中砂岩 2.01 1.36 0.43 4.02 235.17 -17.54 YP01-32-B1b1 极细砂质细砂岩 3.02 1.11 0.44 3.47 200.41 -11.92 平均值 2.37 0.94 0.26 2.38 162.15 -10.66
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