220 research outputs found
The Aragonian and Vallesian high-resolution micromammal succession from the Calatayud-MontalbĂĄn Basin (AragĂłn, Spain)
We present an updated taxonomy and faunal distribution of the micromammal fossil record from the Aragonian and lower Vallesian of the Calatayud-MontalbĂĄn Basin. The analysed record includes the orders Rodentia, Eulipotyphla, and Lagomorpha. The pattern of species turnover showsseven major faunal events,which are correlated to major climate changes based on marine stable oxygen and carbon isotope records. The episodesÎŽ 18OMi-2 and Mi-3 are significantly correlated with major micromammal turnover at the boundaries between lower and middle Aragonian and middle and upper Aragonian, respectively. Our resultssupport the existence of a selective turnover during the Aragonian and lower Vallesian
The Miocene mammal record of the VallĂšs-PenedĂšs Basin (Catalonia)
The land mammal record of the VallĂšs-PenedĂšs Basin (Catalonia, NE Spain) ranges from the early Miocene (Ramblian) to the late Miocene (Turolian), that is from about 20 to 7 Ma. Here we present an updated review of the mammal succession focusing on biochronology as well as on environmental and faunal changes. Based on faunal similarities with central Europe, we interpret this basin as a transitional zone between the forested environments of northern regions and the more arid landscapes of the inner Iberian Peninsula. The quality of the VallĂšs-PenedĂšs record and its chronostratigraphic control is clearly better for the late Aragonian and the Vallesian (between 12.6-9.0 Ma), especially for small mammals. Therefore, we analyze small mammal diversity dynamics during this interval. Contrary to previous analyses, which found an abrupt extinction event coinciding with the early/late Vallesian boundary (the Vallesian Crisis), our results show that this pattern is due to uneven sampling. Instead, taxonomic richness slowly decreased since the late Vallesian as a result of a series of extinctions that mostly affected forest-dwelling taxa
Reconciling the stratigraphy and depositional history of the Lycian orogen-top basins, SW Anatolia
Terrestrial fossil records from the SWAnatolian basins are crucial both for regional correlations and palaeoenvironmental reconstructions.
By reassessing biostratigraphic constraints and incorporating new fossil data, we calibrated and reconstructed the late Neogene
andQuaternary palaeoenvironments within a regional palaeogeographical framework. The culmination of the Taurides inSWAnatolia
was followed by a regional crustal extension from the late Tortonian onwards that created a broad array of NE-trending orogen-top
basins with synchronic associations of alluvial fan, fluvial and lacustrine deposits. The terrestrial basins are superimposed on the upper
Burdigalian marine units with a c. 7 myr of hiatus that corresponds to a shift from regional shortening to extension. The initial infill of
these basins is documented by a transition from marginal alluvial fans and axial fluvial systems into central shallow-perennial lakes
coinciding with a climatic shift from warm/humid to arid conditions. The basal alluvial fan deposits abound in fossil macro-mammals
of an early Turolian (MN11â12; late Tortonian) age. The Pliocene epoch in the region was punctuated by subhumid/humid conditions
resulting in a rise of local base levels and expansion of lakes as evidenced by marsh-swamp deposits containing diverse fossilmammal
assemblages indicating late Ruscinian (lateMN15; late Zanclean) ageWe are grateful for the support of the international
bilateral project between The Scientific and Technological Research
Council of Turkey (TUBITAK) and The Russian Scientific Foundation
(RFBR) with grant a number of 111Y192. M.C.A. is grateful to the
Turkish Academy of Sciences (TUBA) for a GEBIP (Young Scientist
Award) grant. T.K. and S.M. are grateful to the Ege University
Scientific Research Center for the TTM/002/2016 and TTM/001/2016
projects. M.C.A., H.A., S.M. and M.B. have obtained Martin and
Temmick Fellowships at Naturalis Biodiversity Center (Leiden). F.A.D.
is supported by a Mehmet Akif Ersoy University Scientific Research
Grant. T.A.N. is supported by an Alexander-von-Humboldt
Scholarship. L.H.O. received support from TUBITAK under the 2221
program for visiting scientists
Insectivores (Erinaceomorpha, Soricomorpha, Mammalia) from the Ramblian of tbe Daroca-Calamocha area
Se describen las asociaciones de insectĂvoros del estratotipo del Rambliense cerca de Calamocha (Teruel, España), junto de las de San Roque 4A y 4B, dos yacimientos Ramblienses del ĂĄrea-tipo del Aragoniense. Se describar dos especies nuevas, el erinacĂ©ido Galerix remmerti, y la musaraña Clapasorex alvarezae. Tanto el porcentaje de insectĂvoros como su diversidad son mayores en el Rambliense inferior que en el Rambliense superior. Esto indica condiciones mĂĄs hĂșmedas en la zona Z que en la zona A, lo cual contradice las reconstrucciones paleoambientales basadas en roedores.The insectivore assemblages from the Ramblian stratotype near Calamocha (Spain) are described, as well as those from San Roque 4A and 4B, two Ramblian localities near the Aragonian stratotype. Two new species are described, the erinaceid Galerix remmerti, and the shrew Clapasorex alvarezae. Both the percentages and the diversity of insectivores are higher in the Lower Ramblian, suggesting more humid conditions in zone Z than in zone A. This is in contradiction with the palaeoenvironmental reconstructions based on rodents
Trois millions dâannĂ©es de « musaraigne terrifiante » ( <i>Dinosorex</i>, Eulipotyphla, Mammalia) dans le MiocĂšne du bassin VallĂšs-PenedĂšs (Barcelone, Espagne)
Le genre dâHĂ©tĂ©rosoricidĂ© Dinosorex, de la pĂ©ninsule IbĂ©rique, est Ă©tudiĂ© en dĂ©tail pour la premiĂšre fois. La morphologie dentaire, ainsi que les mesures, correspondent Ă la description originale de lâespĂšce Dinosorex grycivensis Rzebik-Kowalska et Topachevsky, 1997, reconnue ainsi pour la premiĂšre fois en Europe du Sud-Ouest. La derniĂšre occurrence de Dinosorex dans le bassin VallĂšs-PenedĂšs coĂŻncide avec la transition du VallĂ©sien basal Ă terminal, et correspond Ă la premiĂšre occurrence du rongeur muridĂ© Progonomys, Ă environ 9,6 Ma. Cette extinction est aussi proche de la date estimĂ©e de la disparition dĂ©finitive du genre du registre fossile. Dâun point de vue Ă©volutif, il est remarquable quâaucun changement morphologique ne puisse ĂȘtre observĂ© dans plus de 40 sites couvrant 3 millions dâannĂ©es. Aussi remarquable, aucune occurrence indiscutable de D. grycivensis ne peut ĂȘtre mise en Ă©vidence en Europe centrale, ce qui permettrait de lier biogĂ©ographiquement les faunes ukrainiennes et ibĂ©riques. Ces rĂ©sultats soulignent clairement le besoin de rĂ©viser les autres formes europĂ©ennes pour placer les fossiles ibĂ©riques dans un plus large contexte, et pouvoir comprendre les facteurs dirigeant lâĂ©volution et lâextinction de la « musaraigne terrifiante ».For the first time, the heterosoricid genus Dinosorex from the Iberian Peninsula has been studied in detail. Dental morphology and measurements match the original description of the species Dinosorex grycivensis Rzebik-Kowalska and Topachevsky, 1997. This is the first time that the species is reported in southwestern Europe. Biostratigraphically, the last occurrences of Dinosorex in the VallĂšs-PenedĂšs basin coincide with the transition from early to late Vallesian, together with the first occurrences of the murid Progonomys, at about 9.6 Ma. This is close in time to the estimated moment of final extinction for the genus. From an evolutionary point of view, it is remarkable that in the more than forty localities in the VallĂšs-PenedĂšs Basin, spanning three million years, there are no apparent morphological changes. Notably, to date, no occurrences have been reported in central Europe that could link the Ukrainian and Iberian assemblages biogeographically. These results clearly highlight the need of revision of other European forms to place the Iberian finds in a broader scenario in order to fully comprehend the factors driving the evolution and ultimately extinction of the âterror-shrewsâ.</p
<i>Heterosorex</i> et Soricidae (Mammalia, Eulipotyphla) de la fissure Petersbuch 28 ; micro-évolution comme indicateur de mélange temporel ?
Le remplissage de la fissure bavaroise Petersbuch 28 (MiocĂšne infĂ©rieur, MN 3/4, Allemagne) a livrĂ© une faune diversifiĂ©e de musaraignes. Les taxons Soricella discrepans Doben-Florin, 1964 et Paenelimnoecus micromorphus (Doben-Florin, 1964) prĂ©sentent une distribution bimodale pour certaines variables dentaires que nous interprĂ©tons ici comme la consĂ©quence dâun intervalle de temps prolongĂ© dâaccumulation des fossiles. De mĂȘme, deux classes de taille dâincisives supĂ©rieures de Miosorex desnoyersianus (Lartet, 1851) ont Ă©tĂ© observĂ©es, suggĂ©rant Ă©galement la prĂ©sence de deux populations diachrones. En plus de ces espĂšces, le site a livrĂ© Heterosorex neumayrianus (Schlosser, 1887), lâunique hĂ©tĂ©rosoricidĂ© reprĂ©sentĂ©, Lartetium petersbuchense Ziegler, 1989, L. cf. prevostianum (Lartet, 1851) et Florinia stehlini (Doben-Florin, 1964). Ces soricidĂ©s confirment que lâĂąge de Petersbuch 28 correspond Ă un intervalle de temps proche de la transition MN3/MN4. Ce site comble ainsi une lacune entre les localitĂ©s de Wintershof-West et de Petersbuch 2. Les deux espĂšces de Lartetium Ziegler, 1989 sont considĂ©rĂ©es comme de probables immigrants.The Bavarian fissure filling Petersbuch 28 (Germany, Lower Miocene, MN 3/4) yielded a diverse assemblage of shrews. Soricella discrepans Doben-Florin, 1964 and Paenelimnoecus micromorphus (Doben-Florin, 1964) show bimodal size distributions in some dental elements, which is interpreted as the result of a small time averaging. Two upper incisor types of Miosorex desnoyersianus (Lartet, 1851) were found, also indicating two populations of slightly different times. Apart from these, the fissure yielded Heterosorex neumayrianus (Schlosser, 1887), the only heterosoricid present, Lartetium petersbuchense Ziegler, 1989, L. cf. prevostianum (Lartet, 1851) and Florinia stehlini (Doben-Florin, 1964). The shrews confirm that Petersbuch 28 represents a time period near the MN 3/MN 4 transition. Thus, it fills the gap between the classical localities of Wintershof-West and Petersbuch 2. The two species of Lartetium Ziegler, 1989 are possible immigrants.</p
- âŠ