M. Reguero, D. Tineo, Paula Bona, L. Pérez, G. Vergani, Gloria González Ruiz, D. Poiré
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引用次数: 1
摘要
在玻利维亚查科前陆盆地北部的地质研究中,发现了来自晚渐新世-晚中新世Petaca组的新化石。在玻利维亚的Subandean地区发现的哺乳动物化石很少。我们报道了一份来自里奥格兰德河阿巴波的Hegetotheriinae (Notoungulata, Typotheria)的部分完整下颌骨。该标本(yppb - litl - al -005)在大小和牙齿形态上与晚新世(Deseadan南美陆地哺乳动物时代,SALMA) - santa rucian(早中新世)Prohegetotherium schiaffinoi (Kraglievich 1932)非常接近,来自Fray Bentos(乌拉圭和阿根廷),Salla(玻利维亚),Divisadero largo - potrerilllos和Quebrada Fiera(阿根廷)。然而,下颌特征,如沿其长度方向高度变化明显,向后增加的形状,突出的咬嵴,深的下颌沟,下颌骨腹缘明显增厚,表明该标本与schiaffinoi和其他hegegetotheriini之间的差异。yplb - litl - pal -005与P. schiaffinoi的亲缘关系表明,Petaca组上部地层(在Abapo)的年龄为渐新世晚期至中新世早期,比先前确定的该单元顶部地层(晚中新世)的年龄要大,并证实了类群分布在南纬~ 36°至~ 17°之间。
A singular Hegetotheriinae (Notoungulata, Typotheria) from the late Oligocene-Early Miocene of the Subandean Region of Bolivia
Abstract Geological studies in the northern sector of the Chaco foreland Basin, Bolivia, yielded new fossils coming from late Oligocene-late Miocene of the Petaca Formation. Few fossil mammals were known from the Subandean Region of Bolivia. We report a partially complete mandible of a hegetotheriid Hegetotheriinae (Notoungulata, Typotheria) from Abapo (Rio Grande River). The specimen (YPFB-LIT-PAL-005) is very close in size and dental morphology to the late Oligocene (Deseadan South American Land Mammal Age, SALMA) — Santacrucian (early Miocene) Prohegetotherium schiaffinoi (Kraglievich 1932) from Fray Bentos (Uruguay and Argentina), Salla (Bolivia), Divisadero Largo-Potrerillos and Quebrada Fiera (Argentina). However, mandibular characteristics, as the shape with a marked change in height along its length, increasing towards the back, a prominent masseteric crest, a deep mandibular groove, and a remarkable thickening of the ventral rim of the mandible, indicate differences between this specimen and Prohegetotherium schiaffinoi and the other Hegetotheriinae. The affinity of YPFB-LIT-PAL-005 with P. schiaffinoi suggests a late Oligocene to early Miocene for the upper bearing horizon of the Petaca Formation (in Abapo), an older age than previously assigned to the top of this unit (late Miocene), and confirms the taxon distribution between ∼ 36 ° to ∼ 17 ° south latitude.
期刊介绍:
The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history.
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