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首页> 外文期刊>Acta Palaeontologica Polonica >The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic-Jurassic boundary
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The sauropodomorph biostratigraphy of the Elliot Formation of southern Africa: Tracking the evolution of Sauropodomorpha across the Triassic-Jurassic boundary

机译：南部非洲艾略特形成的Sauropodomorph生物数据库：跟踪豆科河横跨三叠纪侏罗纪边界的演变

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摘要

The latest Triassic is notable for coinciding with the dramatic decline of many previously dominant groups, followed by the rapid radiation of Dinosauria in the Early Jurassic. Among the most common terrestrial vertebrates from this time, sauropodomorph dinosaurs provide an important insight into the changing dynamics of the biota across the Triassic-Jurassic boundary. The Elliot Formation of South Africa and Lesotho preserves the richest assemblage of sauropodomorphs known from this age, and is a key index assemblage for biostratigraphic correlations with other similarly-aged global terrestrial deposits. Past assessments of Elliot Formation biostratigraphy were haimpered by an overly simplistic biozonation scheme which divided it into a lower "Euskelosaurus" Range Zone and an upper Massospondylus Range Zone. Here we revise the zonation of the Elliot Formation by: (i) synthesizing the last three decades' worth of fossil discoveries, taxonomic revision, and lithostratigraphic investigation; and (ii) systematically reappraising the strati graphic provenance of important fossil locations. We then use our revised stratigraphic information in conjunction with phylogenetic character data to assess morphological disparity between Late Triassic and Early Jurassic sauropodomorph taxa. Our results demonstrate that the Early Jurassic upper Elliot Formation is considerably more taxonomically and morphologically diverse than previously thought. In contrast, the sauropodomorph fauna of the Late Triassic lower Elliot Formation remains relatively poorly understood due to the pervasive incompleteness of many key specimens, as well as the relative homogeneity of their diagnostic character suites. Our metrics indicate that both Elliot Formation and global sauropodomorph assemblages had greater morphological disparity within the Early Jurassic than the Late Triassic. This result is discussed in the context of changing palaeoclimatic conditions, as well as macroevolutionary events associated with the end-Triassic extinction.
机译：最新的三叠系是值得的，因为许多以前占主导地位的戏剧性衰落，其次是早期侏罗纪的恐龙快速辐射。在此时最常见的陆地脊椎动物中，Sauropodomorph恐龙在三叠系 - 侏罗纪边界上提供了对生物群的变化动态的重要洞察。南非和莱索托的艾略特形成留下了该年龄段已知的最富有的Sauropodomorphs，并且是与其他类似年龄的全球陆地沉积物的生物数据库相关性的关键指标组合。过去的艾略特形成生物组织的评估是通过过度简单的生物分布方案来处理，该方案将其分成较低的“Euskelosaurus”范围区和上部纸张范围区。在这里，我们通过以下方式修改艾略特地区的分区：（i）综合过去三十年的化石发现，分类改革和岩石思想调查; （ii）系统地重新评估重要化石地点的Strati图形出处。然后，我们将修订的地层信息与系统发育性格数据结合使用，评估晚期三叠系和早期侏罗纪养老素植物分类群之间的形态差异。我们的结果表明，早期的侏罗纪上艾略特形成比以前思想的差异性和形态学相当多样化。相比之下，由于许多关键样本的普遍性不完全，以及它们的诊断性格套件的相对均匀性，晚期三叠系较低的艾略尔米特的Sauropodomorph群体仍然持续较差。我们的指标表明，艾略特形成和全球Sauropodomorph组合在早期的侏罗纪中的形态差异比晚三叠纪在内。该结果在改变古信草条件的背景下讨论，以及与结束三叠灭绝相关的宏观调度事件。

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