山东诸城棠棣戈庄早白垩世晚期恐龙足迹化石新发现及其意义
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摘要
新近野外调查发现,山东诸城西北棠棣戈庄下白垩统大盛群发育蜥脚类恐龙足迹化石,其赋存于大盛群田家楼组紫红色细砂岩、泥质粉砂岩、粉砂质泥岩和黄绿色粉砂岩韵律层中。研究区共发现29个恐龙足迹化石,其中有23个构成1条半圆形行迹,初步研究确定造迹者为蜥脚类恐龙,个体较小、身长3～4m、处于漫步状态。根据岩层中共生发育的小型槽状交错层理、板状交错层理、爬升波纹层理、水平层理、雨痕、泥裂等沉积构造,认为研究区下白垩统大盛群为滨浅湖沉积,可进一步划分出砂质滩坝、滩坝边缘、沙泥混合滩及泥滩等沉积微相,恐龙足迹化石产在砂质滩坝微相细砂岩、粉砂岩层面上。河湖相细砂岩、粉砂岩有利于恐龙足迹化石赋存,也暗示蜥脚类恐龙喜好在湖岸边活动,表明生活习性与生存环境具有一定的相互制约关系。
In recent field investigation,sauropod footprint fossils were found in the Lower Cretaceous Dasheng Group Tianjialou Formation which consists of red sandstone,argillaceous siltstone,silty mudstone,yellowish green silty sandstone at Tangdigezhuang Village of Zhucheng,Shandong Province.There were 29 dinosaur footprints found in study area,and 23 footprints of them formed a semicircle trackway from northeast to southwest.Characteristics of the footprints suggest that they were made by a sauropod with 3-4 meter long,when walking slowly along lakeshore.The footprint-bearing layer of the Dasheng Group includes small trough cross-bedding,tabular cross-bedding,climbing ripple bedding,horizontal bedding, rain marks and mud cracks,indicating a sedimentary environment of shore-shallow lake.Sandy beach bar,beach bar edge,sand and mud mixed beach, mudflats,etc. , are subdivided,and dinosaur footprints are on the surface of the fine sandstone and siltstone of sandy beach bar.In terms of the above mentioned,the favorable preservation environment of dinosaur footprints is fluvial and shore-shallow lake. Meanwhile,characteristics of dinosaur footprints and the sedimentary environment of footprint-bearing rock indicate a relationship of mutual restriction between the dinosaurs living habits and environment.
In recent field investigation,sauropod footprint fossils were found in the Lower Cretaceous Dasheng Group Tianjialou Formation which consists of red sandstone,argillaceous siltstone,silty mudstone,yellowish green silty sandstone at Tangdigezhuang Village of Zhucheng,Shandong Province.There were 29 dinosaur footprints found in study area,and 23 footprints of them formed a semicircle trackway from northeast to southwest.Characteristics of the footprints suggest that they were made by a sauropod with 3-4 meter long,when walking slowly along lakeshore.The footprint-bearing layer of the Dasheng Group includes small trough cross-bedding,tabular cross-bedding,climbing ripple bedding,horizontal bedding, rain marks and mud cracks,indicating a sedimentary environment of shore-shallow lake.Sandy beach bar,beach bar edge,sand and mud mixed beach, mudflats,etc. , are subdivided,and dinosaur footprints are on the surface of the fine sandstone and siltstone of sandy beach bar.In terms of the above mentioned,the favorable preservation environment of dinosaur footprints is fluvial and shore-shallow lake. Meanwhile,characteristics of dinosaur footprints and the sedimentary environment of footprint-bearing rock indicate a relationship of mutual restriction between the dinosaurs living habits and environment.
引文
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李建军,巴特尔,张维虹,等.2006.内蒙古查布地区下白垩统巨齿龙足印化石[J].古生物学报,45(2):221-234.
李建军,白志强,Lockley M G,等.2010.内蒙古乌拉特中旗恐龙足迹研究[J].地质学报,84(5):723-742.
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李日辉,张光威.2000.莱阳盆地莱阳群恐龙足迹化石的新发现[J].地质论评,46(6):605-610.
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李素,周瑶琪,姚旭,等.2012.鲁东诸城地区恐龙足迹化石和原形恢复研究[J].地质论评,58(3):434-443.
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柳永清,旷红伟,彭楠,等.2011.山东胶莱盆地白垩纪恐龙足迹与骨骼化石埋藏沉积相与古地理环境[J].地学前缘,18(4):9-24.
彭冰霞,杜远生,李大庆,等.2004.甘肃永靖盐锅峡早白垩世翼龙足迹的发现及意义[J].地球科学,29(1):21-24.
山东省第四地质矿产勘察院.2003.山东省区域地质志[M].山东济南:山东省地图出版社,1-970.
施炜,张岳桥,董树文,等.2003.山东胶莱盆地构造变形及形成演化:以王氏群和大盛群变形分析为例[J].地质通报,22(5):325-334.
司双印.2002.山东省大盛群孢粉组合及其年代地层意义[J].地层学杂志,26(2):126-129.
汤加富,李怀坤,娄清.2003.郯庐断裂南段研究进展与断裂性质讨论[J].地质通报,22(6):426-436.
陶卫卫,唐永光,曹丽丽,等.2012.山东省临沭县常林钻石省级地质公园地质遗迹资源类型与评价[J].山东地质,(2):25-28.
王全伟,阚泽忠,梁斌,等.2005.四川天全地区晚三叠世地层中发现恐龙足迹化石[J].地质通报,24(12):1179-1180.
王先美,钟大赉,王雪松,等.2007.沂沭断裂带早白垩世晚期伸展的低温年代学证据[J].地质科学,42(4):625-638,778.
王勇生,朱光,宋传中,等.2006.大别山东端郯庐断裂带由走滑向伸展运动转换的40Ar-39Ar年代学记录[J].地质科学,41(2):242-255.
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