A Lower to Middle Jurassic Terrestrial Vertebrate Assemblageand its Implications for the Post-Triassic Radiation of Tetrapods

中侏罗世陆生脊椎动物组合及其对后三叠世四足动物辐射的影响

• 批准号: 8917386
• 负责人: David Fastovsky
• 金额: $ 11.92万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-15 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917386&HistoricalAwards=false
• 关键词: Lower; Middle; Jurassic; Terrestrial; Vertebrate

PI will study the implications of an exceptional Lower or Middle Jurassic vertebrate assemblage for the diversification of terrestrial tetrapods following the mass extinction(s) at the end of the Triassic. The vertebrate assemblage, from the La Boca Formation, Huizachal Canyon, Tamaulipas, Mexico, affords a unique test of whether rapid adaptive radiation, commonly inferred to follow mass extinctions, occurred in post-Triassic global vertebrate faunas. Preliminary work indicates that: a)based upon vertebrate biostratigraphy, the age of the assemblage (which includes new taxa) is ambiguously Lower or Middle Jurassic; and b)the assemblage accumulated under unique depositional conditions, in a structurally complex setting that hinders simple lithostratigraphic correlations. To integrate the Huizachal assemblage into a reconstruction of post-Triassic tetrapod diversification, PI will a)study the systematic paleontology of the assemblage, including a phylogenetic characterization; b)establish a lithostratigraphy for Huizachal Canyon involving the reconstruction of sedimentary environments; and c)constrain the age of the Huizachal assemblage by means other than vertebrate biostratigraphy. Having accomplished these prerequisites, they will integrate results into phylogenetically-based compilations of post-Triassic terrestrial diversity, to test the idea that the early Jurassic was characterized by a rapid radiation of terrestrial vertebrates.

PI将研究特殊较低或 中侏罗世脊椎动物组合的多样性 大灭绝结束后的陆地四足动物 三叠纪时期 来自拉博卡的脊椎动物群 形成，Huizachal峡谷，塔毛利帕斯州，墨西哥，提供了一个独特的 快速适应性辐射，通常被推断为 发生在后三叠纪全球 脊椎动物群 初步工作表明： a）根据脊椎动物生物地层学， 组合（其中包括新的分类群）是模棱两可的低或 中侏罗世;以及 B）独特沉积条件下的组合 在结构复杂的环境中， 岩石地层对比 将惠扎哈尔的组合整合到一个重建中 后三叠纪的四足动物多样化，PI将 a）研究该组合的系统古生物学， 包括系统发育特征; B）建立惠扎查尔峡谷的岩石地层学 涉及沉积环境的重建;以及 c）通过以下方法限制Huizachal组合的时代 除了脊椎动物生物地层学。 完成这些先决条件后，他们将整合 结果变成了基于遗传学的后三叠纪 陆地生物多样性，来验证早侏罗世 其特点是地球上的快速辐射 脊椎动物