COLLABORATIVE RESEARCH: Paleoenvironments and Patterns of Vertebrate Evolution in the Early Cretaceous of Texas

合作研究：德克萨斯州早白垩世的古环境和脊椎动物进化模式

• 批准号: 9206691
• 负责人: Dale Winkler
• 金额: $ 6.4万
• 依托单位: Southern Methodist University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-06-15 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206691&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Paleoenvironments; Patterns; Vertebrate

This analysis will test the roles of paleoenvironmental distribution and adaptation in the evolutionary origins of tetrapod lineages and the causes of local patterns of faunal turnover in the Texas Early Cretaceous. The well preserved vertebrate fauna being produced from a sequence spanning as much as 15 my includes diverse fishes, amphibians, lacertilians, dinosaurs, and mammals, many of which are new. Faunas are found in the intercalated marine and terrestrial sediments of the Comanche Series, in habitats ranging from open marine shelf to inland semi-arid floodplain. Abundances of vertebrate taxa through the section will be analyzed quantitatively to determine the relationships of taxa to specific environments and their patterns of change through the section. Paleoenvironments will be assessed based on the sedimentary context of vertebrate localities. Building upon samples already in hand the stratigraphic and paleoenvironmental diversity of the vertebrate record will be further developed through a program of screen washing and through quarrying where feasible. Search efforts will focus on poorly sampled stratigraphic intervals in central Texas and on more inland environments preserved to the west and south.

该分析将测试古环境分布和适应在四足动物谱系的进化起源中的作用，以及德克萨斯州早期白垩纪的局部动物周转率的原因。 保存完好的脊椎动物动物群是由多达15个的序列产生的，其中包括多样化的鱼类，两栖动物，Lacertilians，恐龙和哺乳动物，其中许多都是新的。 在Comanche系列的插入式海洋和陆地沉积物中发现了动物区系，在从开放式船舶架到内陆半干旱洪泛区等栖息地。 通过本节进行脊椎动物分类单元的丰富性，将进行定量分析，以确定分类单元与特定环境的关系及其通过本节的变化模式。 将根据脊椎动物区域的沉积环境评估古环境。 在脊椎动物记录的地层和古环境多样性的基础上，将通过屏幕洗涤程序和可行的采石场进一步开发。 搜索工作将集中在得克萨斯州中部和西部和南部保留的更多内陆环境中采样不良的地层间隔。