Alba David M, Robles Josep M, Casanovas-Vilar Isaac, Beamud Elisabet, Bernor Raymond L, Cirilli Omar, DeMiguel Daniel, Galindo Jordi, Llopart Itziar, Pons-Monjo Guillem, Sánchez Israel M, Vinuesa Víctor, Garcés Miguel
Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/ Columnes s/n, Campus de la UAB, 08193 Cerdanyola del Vallès, Barcelona, Spain.
Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/ Columnes s/n, Campus de la UAB, 08193 Cerdanyola del Vallès, Barcelona, Spain.
J Hum Evol. 2022 Sep;170:103237. doi: 10.1016/j.jhevol.2022.103237. Epub 2022 Aug 18.
The Abocador de Can Mata (ACM) composite stratigraphic sequence (els Hostalets de Pierola, Vallès-Penedès Basin, NE Iberian Peninsula) has yielded a diverse primate assemblage from the late Aragonian (Middle to Late Miocene). Detailed litho-, bio-, and magnetostratigraphic control has enabled an accurate dating of these fossil remains. Comparable data, however, were lacking for the nearby locality of Can Mata 1 (CM1), which yielded a dryopithecine canine of a female individual. Given the lack of hipparionin equids and giraffids, CM1 has been correlated to the latest Aragonian (Mammal Neogene [MN] zone MN7+8). Here we revise the age of CM1 based on fieldwork and associated paleomagnetic samplings undertaken in 2018-2021. Our results extend the ACM composite sequence upward and indicate that CM1 correlates to the earliest Vallesian (MN9). The updated ACM sequence has a thickness of ∼300 m and comprises 12 magnetozones correlated to subchrons C5Ar.1r to C5n.2n (∼12.6-11.1 Ma; latest MN6 to earliest MN9, late Aragonian to earliest Vallesian). CM1 is correlated to C5r.1r (11.146-11.056 Ma), with an interpolated age of 11.11 Ma, thus postdating the dispersal of hipparionin horses into the Vallès-Penedès Basin-which is correlated to the previous subchron C5r.1n, with an interpolated age of 11.18 Ma, and by definition marks the beginning of the Vallesian. CM1 also minimally postdates the earliest record of giraffids at ACM-representing their earliest well-dated occurrence in the basin-being correlated to C5r.1n with an interpolated age of 11.11 Ma. We conclude that CM1 has an earliest Vallesian (MN9) age of ∼11.1 Ma, intermediate between the Aragonian dryopithecins and the Vallesian hispanopithecins. Ongoing paleontological surveillance at ACM thus offers the prospect to yield additional earliest Vallesian ape remains, which are essential to clarify their taxonomic allocation as well as to confirm whether hispanopithecins evolved locally from dryopithecins rather than immigrating from elsewhere during MN9.
卡恩·马塔洞穴（ACM）复合地层序列（位于西班牙伊比利亚半岛东北部瓦列斯-佩内德斯盆地的皮耶罗拉的霍斯塔莱茨）产出了来自阿拉贡晚期（中新世中期至晚期）的多样灵长类动物组合。详细的岩性、生物和磁地层控制使得能够对这些化石残骸进行精确测年。然而，附近的卡恩·马塔1号地点（CM1）却缺乏可比数据，该地点出土了一具雌性个体的森林古猿犬齿。鉴于缺乏上新马类马科动物和长颈鹿科动物，CM1已被关联到阿拉贡晚期最新阶段（哺乳动物新近纪[MN]带MN7+8）。在此，我们基于2018 - 2021年进行的野外工作和相关古地磁采样，对CM1的年代进行了修订。我们的结果将ACM复合序列向上延伸，并表明CM1与瓦列西安期最早阶段（MN9）相关。更新后的ACM序列厚度约为300米，包括12个磁区，与亚时标C5Ar.1r至C5n.2n相关（约1260 - 1110万年前；MN6晚期至MN9早期，阿拉贡晚期至瓦列西安期最早阶段）。CM1与C5r.1r相关（1114.6 - 1105.6万年前），插值年龄为1111万年前，因此晚于上新马类马科动物扩散到瓦列斯-佩内德斯盆地的时间——该盆地与前一个亚时标C5r.1n相关，插值年龄为1118万年前，根据定义标志着瓦列西安期的开始。CM1也至少晚于ACM长颈鹿科动物的最早记录——这代表了它们在该盆地最早的可靠出现时间——与C5r.1n相关，插值年龄为1111万年前。我们得出结论，CM1的最早瓦列西安期（MN9）年龄约为1110万年前，介于阿拉贡森林古猿和瓦列西安西班牙古猿之间。因此，在ACM正在进行的古生物学监测有望发现更多瓦列西安期最早阶段的猿类残骸，这对于阐明它们的分类归属以及确认西班牙古猿是否在MN9期间从森林古猿本地演化而来而非从其他地方迁入至关重要。
