The age of the Tashinga Formation (Karoo Supergroup) in the Mid-Zambezi Basin, Zimbabwe and the first phytosaur from mainland sub-Saharan Africa
The age of the Tashinga Formation (Karoo Supergroup) in the Mid-Zambezi Basin, Zimbabwe and the first phytosaur from mainland sub-Saharan Africa
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DOI：
10.1016/j.gr.2019.12.008
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发表时间：
2020-05-01
影响因子：
6.1
通讯作者：
Choiniere, Jonah N.
中科院分区：
文献类型：
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作者：
Barrett, Paul M.;Sciscio, Lara;Choiniere, Jonah N.
由于缺乏共同的索引化石和关键地层的放射性同位素年代，南部非洲和东部非洲卡鲁年龄盆地内的大陆序列之间的关联很困难。在这里，我们描述了卡里巴湖东南岸线的四个地点。津巴布韦。在中赞比西盆地内，从非正式的塔欣加组（上卡鲁群）中产生植龙类（原龙形目：植龙亚目）材料。这些植物龙遗骸是第一批从撒哈拉以南非洲大陆发现的遗骸，代表着该类群的主要地理范围延伸至南部高纬度地区。此外，源自碎屑锆石的 LA-ICPMS 最大沉积年龄为 209.2 +/- 4.5 Ma（诺里安晚期/雷蒂安早期），为这些地点提供了第一个绝对年龄估计。植龙类与肺鱼和变龙科两栖动物有关，构成陆生生物群的一部分，这是南部非洲晚三叠世以前未记录的生物群落。 (C) 2020 年国际冈瓦纳研究协会。由 Elsevier B.V. 出版。保留所有权利。
Correlations between continental sequences within the Karoo-aged basins of southern and eastern Africa are difficult due to the dearth of shared index fossils and a lack of radioisotopic dates for key formations. Here we describe four sites along the southeastern shoreline of Lake Kariba. Zimbabwe. within the Mid-Zambezi Basin, that yield material of phytosaurs (Archosauromorpha: Phytosauria) from within the informal Tashinga Formation (Upper Karoo Group). These phytosaur remains are the first to be recovered from sub-Saharan mainland Africa, representing a major geographic range extension for this group into high southern latitudes. Furthermore, an LA-ICPMS maximum depositional age of 209.2 +/- 4.5 Ma (late Norian/early Rhaetian) derived from detrital zircons provides the first absolute age estimate for any of these sites. The phytosaurs are associated with lungfish and metoposaurid amphibians, forming part of a terrestrial-aquatic dominated biota, a previously undocumented biome from the Late Triassic of southern Africa. (C) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.