Sobre uma Edentata Milodontidae do Pleistoceno - sub-recente da Bahia, Brasil

O presente estudo é dedicado à descrição e comparação do rádio, esqueleto da mão e de partes do pé de um Glossotherium, achados numa gruta do Município de Morro do Chapeu (Bahia). A descrição osteológica recebeu ênfase especial visto não existir nenhum estudo em português sobre o tema. Após estudo comparativo detalhado, propõe-se a revalidação do sub-gênero Ocnotherium Lund, 1842 que constitui forma intertropical do gênero Glossotherium Owen, 1840. Nossa classificação baseia-se na que Hoffstetter estabeleceu em 1952. Concluindo pela não identidade específica e subgenérica da forma de Lagoa Santa com as formas argentinas, preferimos, por enquanto, identificar especificamente a forma que descrevemos como a mesma cujos restos foram coletados em Lagoa Santa por Lund e estudados por Winge (1915). A não presença na coleção de Lagoa Santa de elementos esqueletais homólogos com os aqui descritos impede comparação direta entre o nosso material e o que se conhece de Lagoa Santa. Isto, porém, não obsta a conclusão de que os elementos em causa sejam considerados como provenientes de uma mesma espécie de milodontídeos, que é reforçada pelo fato de que uns e outros procedem de uma mesma região geográfica de habitat ecológico idêntico.The following study is dedicated to a description and a comparison of the radius, the banes of hand and part of the foot of a Glossotherium, found in a cave near the town of Morro do Chapeu (Bahia). The osteological description had a special attention, due to a lack of works in portuguese about the subject. After a detailed comparative study, it is suggested the revalidation of the subgenus Ocnotherium Lund, 1842 which is a intertropical form of the genus Glossotherium Owen, 1840. Our classification in based on the one stablished by Hoffstetter in 1952. Concluding by the non specifical and subgenerical identity of the Lagoa Santa form with Argentinean ones, we prefer, for the time being, to identify specifically the form we describe here as the same one whose pieces Lund col lected in Lagoa Santa, and Winge studied in 1915. The non presence of similar skeletal elements in the Lagoa Santa collection similar to those here described does not permit us a direct comparison betwen our material and that known in Lagoa Santa. This, however, should not pose a problem to us conclude that the elements above described can be considered as belonging to the same species of milodontids. This assumption is based on the fact that both materials come from the same geographical region, in similar ecological ''habitat''

The timing of the postglacial marine transgression in the Ría de Ferrol (NW Iberia): a new multiproxy approach from its sedimentary infill

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUGThe Ría de Ferrol is a confined tide-dominated incised valley in the mesotidal passive Atlantic margin of NW Iberia. A new multidisciplinary approach enables a high-resolution reconstruction of the main environmental changes affecting this area during the Lateglacial and the Holocene. We defined the main seismic and sedimentary facies in the infill and selected different key points to be cored. A number of multiproxy analyses were performed on four sections of sediment (sedimentology, X-ray fluorescence, radiocarbon dating and palynological analyses). Physiography exerted a strong control on the evolution of the basin, as a rock-bounded narrow channel in the middle of the basin influenced the flooding of the ria during the postglacial marine transgression. Depositional environments shifted towards the east as the sea level rose and fluvial facies at the base were covered by facies from a tide-dominated estuary, which were predominant during most of the Holocene. Several layers of sediments from stagnant freshwater areas dominated by Juncus sp. were recovered at ca. −20.5 to −21, ca. −13.1 to −13.5, −12.5 to −12.8 and −12.1 to −13.5 m NMMA along the central axis of the embayment, and dated to be older than 10190–10290; 10790–10970; 7510–8220 and 7130–7830 cal yr BP. They may respectively represent a local stage of lowering sea-level dated at the end of the Lateglacial (i.e. the Younger Dryas), and different episodes of deceleration/stabilization of sea-level rise occurred during the early Holocene (i.e. the 11.4, 10.5, 9.3, 8.2 kyr Henrich events). Thus, for the first time in this region, we were able to generate a high-resolution spatial–temporal interpretation of environmental changes linked to the relative sea-level variations using subtidal sediments from the same sub-basin (and thus free of substantial/differential post-depositional deformations) that describes in detail the flooding of the ancient coastal plains of this region at the beginning of the Holocene.Ministerio de Economía y Competitividad | Ref. CGL2012-33584Ministerio de Economía y Competitividad | Ref. BES-2013-066901Xunta de Galicia | Ref. ED431C 2019/2

New multiproxy data obtained from the sedimentary fill of the Ría de Ferrol, NW Iberia

Financiado para publicación en acceso aberto: Universidade de Vigo/CISUGSeveral gravity cores and vibro-cores were recovered from selected sites in the inner sector of Ría de Ferrol, NW Iberia (Muñoz Sobrino et al., 2021) [1]. These sediment cores were obtained during the surveys ECOMER-2014 and ECOMER-2015, developed from 2014 to 2015 on-board the R/V Mytilus (Consejo Superior de Investigación Científica) and the Amarradores Mil (Amarradores del Puerto y Ría de Ferrol, S.L.), respectively. Sedimentary and other multiproxy data presented here belong to four selected sediment cores located in the innermost part of the study area. Two were recovered using a gravity corer and another two using a vibro-corer. The depth of the cores and samples obtained is referred to the NMMA (the mean sea level in Alicante), which is the Spanish orthometric datum. One half of each core was subjected to non-destructive analysis using an ITRAX core scanner providing X-ray fluorescence (XRF) elemental data. Particle size distribution was characterised by laser diffraction. For radiocarbon dating, well-preserved articulated valves, small remains of wood and very organic bulk sediment from one location free of biogenic gas were selected. Palynological analyses were performed on selected sections of the sediment. All samples were spiked with Lycopodium spores for absolute palynomorph estimation and analysed using 400x and 600x magnifications. The ratio of dinoflagellate cyst concentrations to pollen, fern spore and dinoflagellate cyst concentrations (D/P ratio, ranging between 0 and 1) was calculated for each sample to show the temporal variation. Combined seismic, lithological, elemental, chronological and palynological data enable reconstructing the environmental changes that occurred during the local marine transgression. Besides, the combination of evidence identified may also be applied to other areas or periods in order to perform local reconstructions of changing coastal ecosystems. This type of high-resolution spatial-temporal reconstructions of past changes in estuarine environments may be a valuable tool for modelling, predicting and managing the changes and threats linked to the global warming and sea-level rise associated.Ministerio de Economía y Competitividad | Ref. CGL2012-33584Ministerio de Economía y Competitividad | Ref. BES-2013-066901Xunta de Galicia | Ref. ED431C 2019/2

New multiproxy data obtained from the sedimentary fill of the Ría de Ferrol, NW Iberia

All the samples studied were collected during 2014 and 2015 at the innermost embayment of the Ría de Ferrol, a confined tide-dominated incised valley in the mesotidal passive Atlantic margin of NW Iberia. All the selected elemental datum from cores VC7, GC2X, GC2P and VC3 is available as supplementary data files (Supplementary S1 to S4). Those data summarise the geochemical evidence related to the changing marine/terrestrial influences recorded in each site cored. Raw data (counts) of pollen, non-pollen palynomorphs (NPP), and dinoflagellate cysts obtained in every section of sediment studied in cores VC7, GC2X, GC2P and VC3 are also available as supplementary data files (Supplementary S5 to S8). Other necessary data (sample weight, number of tablets added per sample, average of Lycopodium spores per tablet, and the exotic Lycopodium spores counts per sample) to calculate the absolute abundances and the Dinoflagellate cyst / Pollen ratios (D/P) in each sample are also reported