In the Eocene deposits of Northwestern Argentina, the order Cingulata was recognized in the sedimentary levels of the upper and lower sections of the Lumbrera (Salta Province), Geste (Catamarca and Salta provinces), Quebrada de Los Colorados (Salta Province), and Casa Grande (Jujuy Province) formations. The traditional biochronological scheme associated the Geste Formation to the Mustersan SALMA (37.3–35.4 Ma; Priabonian), the lower section of the Lumbrera Formation to the Vacan Subage (44–46 Ma; Lutetian) of the Casamayoran SALMA, and the fossiliferous levels of the remaining units to the Barrancan Subage (39–42 Ma; Bartonian) of the Casamayoran SALMA. Nevertheless, recent dating obtained for the top of the lower section of the Lumbrera Formation supports a new geochronological framework for Northwestern Argentina, which changes the temporal assignation of the taxa that have been collected in this section, going from the Vacan Subage to the Itaboraian SALMA, affecting also the biochronology of the Quebrada de Los Colorados and the upper section of the Lumbrera formations, which are now constrained between 46 and 40 Ma (Lutetian). In this contribution, we present a new cingulate assemblage based on osteoderms collected in the basal levels of the Quebrada de Los Colorados Formation at Los Cardones National Park, Calchaquí Valley (Salta, Northwestern Argentina), which is constituted by a new taxon plus Pucatherium parvum and Parutaetus punaensis. In addition, we discuss all the Eocene cingulate associations reported for Northwestern Argentina taking into consideration the new geochronological framework.

在阿根廷西北部始新世矿床中，在 Lumbrera（萨尔塔省）、Geste（卡塔马卡省和萨尔塔省）、Quebrada de Los Colorados（萨尔塔省）和 Casa 的上部和下部沉积层中发现了 Cingulata 目格兰德（胡胡伊省）队形。传统的生物年代学方案将 Geste 组与 Mustersan SALMA（37.3-35.4 Ma；Priabonian）、Lumbrera 组的下部与 Casamayoran SALMA 的 Vacan Subage（44-46 Ma；Lutetian）以及剩余的单元到 Casamayoran SALMA 的 Barrancan Subage（39-42 Ma；Bartonian）。尽管如此，最近获得的 Lumbrera 组下部顶部的测年支持了阿根廷西北部的新地质年代框架，这改变了在本节中收集的分类群的时间分配，从 Vacan Subage 到 Itaboraian SALMA，也影响了 Quebrada de Los Colorados 和 Lumbrera 地层上部的生物年代学，它们现在被限制在46 和 40 Ma (Lutetian)。在此贡献中，我们提出了一种新的扣带回组合，该组合基于在 Calchaquí 山谷（萨尔塔，阿根廷西北部）Los Cardones 国家公园的 Quebrada de Los Colorados Formation 的基础水平收集的骨皮，它由一个新的分类群加上 现在限制在 46 到 40 Ma（Lutetian）之间。在此贡献中，我们提出了一种新的扣带回组合，该组合基于在 Calchaquí 山谷（萨尔塔，阿根廷西北部）Los Cardones 国家公园的 Quebrada de Los Colorados Formation 的基础水平收集的骨皮，它由一个新的分类群加上 现在限制在 46 到 40 Ma（Lutetian）之间。在此贡献中，我们提出了一种新的扣带回组合，该组合基于在 Calchaquí 山谷（萨尔塔，阿根廷西北部）Los Cardones 国家公园的 Quebrada de Los Colorados Formation 的基础水平收集的骨皮，它由一个新的分类群加上Pucatherium parvum和Parutaetus punaensis。此外，考虑到新的地质年代框架，我们讨论了阿根廷西北部报告的所有始新世扣带回关联。