Alfredo E. Zurita , Carlos A. Luna , Francisco Cuadrelli , Daniel Barasoain , Ricardo H.A. Gómez , Omar Medina , Ángel R. Miño-Boilini
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引用次数: 0
Abstract
Since the XIX century, the mammalian palaeofauna that inhabited the Pleistocene (ca. 2.6–0.0011 Ma) of South America is well known in several regions of this subcontinent, especially in the lowlands and at high latitudes. However, there is an imbalance in our knowledge of the diversity achieved by this palaeofauna, especially in the highlands of the current territory of Bolivia, known mainly from the Tarija Valley. With the aim of improving this situation, this paper presents and describes new fossil localities yielding Pleistocene mammals from the northern Department of Chuquisaca, in the Eastern Cordillera and Subandean geological provinces (ca. 2500–3500 m.a.s.l.). These localities include Sucre (S), Yampárez (Ya), Yotala (Yo), Redención Pampa (Rp), Potolo (P), Quila Quila (Q), Maragua (M), and Padilla (Pa), from which eight taxa have been identified: Xenarthra: Panochthus sp. (Rp, Ya), Glyptodon jatunkhirkhi (Yo, Rp), Pampatherium sp. (Rp), Tolypeutes cf. T. matacus (Rp), Megatherium sp. (P); Perissodactyla: Equus sp. (Yo, Rp, Q, M); Artiodactyla: Lama guanicoe (Rp); Proboscidea: Cuvieronius hyodon (Rp). The results show that so far G. jatunkhirkhi is endemic to the Eastern Cordillera and Subandean ranges, while it is reported the first Pleistocene record of Tolypeutes (Chlamyphoridae) for Bolivia, previously restricted to the Early Holocene, in addition to the first mandibular remains of G. jatunkhirkhi, which allows a better characterization of this species. Overall, the recognized assemblages suggest the presence of open and arid/semiarid environments, taking into account the presence of two living sensitive species, i.e. Tolypeutes T. cf. matacus and L. guanicoe. The large number of specimens recorded shows the high fossil potential of some localities in northern Chuquisaca.
期刊介绍:
Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields:
-Economic geology, metallogenesis and hydrocarbon genesis and reservoirs.
-Geophysics, geochemistry, volcanology, igneous and metamorphic petrology.
-Tectonics, neo- and seismotectonics and geodynamic modeling.
-Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research.
-Stratigraphy, sedimentology, structure and basin evolution.
-Paleontology, paleoecology, paleoclimatology and Quaternary geology.
New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.