During the Devonian, the Gondwana supercontinent was in a paleogeographic position in high-latitudes, close to the South Pole. The arrangement of continents, tectonic activity, climate fluctuations, and the evolution of marine life played an important role in the marine ecosystems during this period. Conodont occurrences in high-latitudes are scarce. In the Upper Devonian (Frasnian/Famenian) of western Gondwana, conodonts have been found in anoxic black-shale deposits associated with maximum flooding surface (MFS) of a distal platform, in the Barreirinha Formation of the Amazonas Basin and Jandiatuba Formation of the Solimões Basin, in northern Brazil. The fauna is characterized by low diversity and well-preserved platform and ramiform elements of , sp. aff. , sp. and sp. in the Amazonas Basin and sp., sp., sp. and sp. in the Solimões Basin. The conodont faunal association and sedimentary succession suggest a marine ingression in cool water conditions to the Devonian sea of the Amazonian region.

中文翻译：

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巴西亚马逊和索利莫斯盆地泥盆纪牙形石侵入冈瓦纳西部的海洋记录

泥盆纪时期，冈瓦纳超大陆处于高纬度、靠近南极的古地理位置。大陆排列、构造活动、气候波动以及海洋生物的演化等对这一时期的海洋生态系统发挥了重要作用。高纬度地区的牙形刺很少见。在冈瓦纳西部的上泥盆统（弗拉斯尼阶/法门阶），在亚马逊盆地的巴雷里尼亚地层和索里莫斯的扬迪亚图巴地层中与远端平台最大淹没面（MFS）相关的缺氧黑色页岩沉积物中发现了牙形刺。盆地，位于巴西北部。该动物区系的特点是多样性低、平台和枝状元素保存完好。亲。 ，sp。和sp。在亚马逊盆地和 sp.，sp.，sp。和sp。位于索利莫斯盆地。牙形刺动物群群和沉积演替表明，在冷水条件下，海洋侵入亚马逊地区的泥盆纪海。