Abstract Vertebrates that inhabited northern South America few million years after the Cretaceous-Paleogene (K-Pg) event are still poorly known. Here I present remains of turtles and crocodylomorphs from the lower to middle Paleocene, Lisama Formation of Colombia; representing the first record of Paleocene vertebrates for the Middle Magdalena Valley Basin, and one of the earliest Paleocene northern South American faunas. Although it is impossible to establish detailed systematic paleontology due to their fragmentary preservation, I demonstrate that bone cells (osteocytes) are preserved in some of these fragments.

中文翻译：

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哥伦比亚中马格达莱纳河谷盆地古新世 Lisama 地层的第一批脊椎动物遗骸

摘要 在白垩纪-古近纪 (K-Pg) 事件发生后几百万年居住在南美洲北部的脊椎动物仍然鲜为人知。在这里，我展示了哥伦比亚 Lisama 组从下古新世到中古新世的海龟和鳄鱼的遗骸；代表了中马格达莱纳河谷盆地古新世脊椎动物的第一个记录，也是南美北部最早的古新世动物群之一。尽管由于它们的碎片保存而无法建立详细的系统古生物学，但我证明在其中一些碎片中保存了骨细胞（骨细胞）。