Papers by Jean-Jacques Jaeger
Newsletters on Stratigraphy, Feb 3, 1993
Paléorient, 1983
L'âge du gisement d'Ubeidiya, récemment remis en cause, est discuté. Une estimation raiso... more L'âge du gisement d'Ubeidiya, récemment remis en cause, est discuté. Une estimation raisonnable permettrait de situer ce gisement dans un intervalle de temps compris entre 1 650 000 ans et 900 000 ans environ.
Journal of Vertebrate Paleontology, Jul 4, 2021
We describe several mammal taxa from the poorly known late Eocene locality of Bang Mark, Krabi Ba... more We describe several mammal taxa from the poorly known late Eocene locality of Bang Mark, Krabi Basin in southern Thailand. Most of them were unknown in that locality that now includes nineteen distinct taxa. The new material corresponds to dental remains that can be attributed to a carnivore, a dichobunid, ruminants, anthracotheres and perissodactyls. These remains provide information on the affinities of several genera that were uncertain so far. Archaeotragulus might be more closely related to Siamotragulus from the Miocene of Southeast Asia, Pakistan and East Africa, and the tragulid status of Krabitherium is supported by the morphology of its p4. We also describe the smallest known anthracothere, Geniokeryx nanus sp. nov., and a new species of eomoropid chalicothere, Eomoropus meridiorientalis sp. nov., that represents the first record of that family in the Krabi fauna. This work also supports the contemporaneity of Bang Mark with Wai Lek and Bang Pu Dam. the taxa that were described included a rodent, three primates, two suoids and two anthracotheres. We report here additional mammal remains collected from the Bang Mark pit. They can be attributed to a small caniformia, the dichobunid Progenitohyus, the tragulids Archaeotragulus and Krabitherium, the lophiomerycid Krabimeryx, the anthracotheriids Geniokeryx thailandicus and Anthracotherium chaimanei, and the rhinocerotid Guixia simplex. We also report the first occurrence of a new species of chalicotheriid perissodactyl in the Krabi Basin (and thus in the late Eocene of southern Asia), of a new genus and species of rhinocerotoid, and a new diminutive anthracothere is identified. METHODS Dental Terminology-The dental terminology used here follows Boisserie et al.
Buletin Persatuan Geologi Malaysia, Dec 1, 1999
Excavations undertaken since several years in the Eocene sites of the Krabi basin (southern Thail... more Excavations undertaken since several years in the Eocene sites of the Krabi basin (southern Thailand) has yielded six genera of reptiles and 31 different species of mammals, among which are several forms new to Southeast Asia. Nearly all vertebrate remains have been collected from lignite levels, and their study indicates a rather closed area submitted to a tropical climate. In addition to considerably increase our knowledge ofthe early Tertiary terrestrial vertebrate faunas of southern Asia, these Thai remains allow to propose an accurate age for this mammal fauna. They also can be related to known late Eocene and/or early Oligocene forms from Europe, North Mrica, Asia, or even North America. The study of the evolutionary stages ofthe different taxa of the Krabi fauna, and comparisons with other well dated mammalian faunas from Eurasia and North Mrica, led us to propose a late Eocene age for the mammal fauna (about ±37 to ±34 Ma). A magnetostratigraphic study has been carried out on the late Eocene fluviatilell acustrine Krabi deposit (southern Thailand). 87 samples in 43 different stratigraphic levels were collected from a thickness of 105 m of the section. These paleomagnetic samples were analysed, and they yielded a paleomagnetic direction. Rock magnetic experiments show that the NRM generally results from the presence of magnetite. The Krabi section that has been sampled displays only reverse polarity. The mean direction for reversed polarity samples was D = 192.34, I =-15.5 (N = 71, <X95 = 4.7, k = 14). The correlation to the Geomagnetic Polarity Time Scale (GPTS) relies on the biostratigraphic data previously proposed for the fauna found in the same section. These correlations have been achieved by comparing variations in the sedimentary rate derived from the alternative correlation. The proposed correlation puts Krabi section in the chron C13r (34.1 Ma) or C15r (35.14 Ma). This suggests sedimentation rates of 9.4 and 26 cm/ky respectively, but the second sedimentation rate is too high for this type of sediments (lignite). Hence, the most probable correlation for the Krabi section is with chron C13r (33.54-34.65 Ma).
Comptes Rendus Palevol, Mar 1, 2019
We describe two entelodontid upper premolars that were recovered from the late Eocene of the Krab... more We describe two entelodontid upper premolars that were recovered from the late Eocene of the Krabi coal mine in southern Thailand. The size and morphology of the material suggest that it can be referred to Entelodon aff. E. gobiensis, a species known from the late Eocene to the early Oligocene of northern Asia and southern China. The Thai material documents for the first time the southernmost occurrence of entelodontids in Asia during the Paleogene and also suggests that Eocene Southeast Asian mammal localities might potentially yield further entelodontid remains mostly associated with selenodont ungulates.
HAL (Le Centre pour la Communication Scientifique Directe), 2020
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires Comptes Rendus Palevol est une revue en flux continu publiée par les Publications scientifiques du Muséum, Paris et l'Académie des sciences, Paris
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
The anthracothere Siamotherium pondaungensis from the late middle Eocene Pondaung Formation in My... more The anthracothere Siamotherium pondaungensis from the late middle Eocene Pondaung Formation in Myanmar was known only from its upper dentition. Recent field work in the Pondaung deposits has led to the discovery of a juvenile fragmentary mandible preserving d3-d4, m1-m2 and erupting p3-p4. The morphology, structure and dimensions of these lower teeth (including simple and bunodont lower premolars with weakly developed talonids, lower molar trigonids and talonids of similar width, entoconid that lacks a postectoentocristid and slightly distal to the hypoconid) confirm their attribution to S. pondaungensis which is now documented by its almost complete dentition, and further demonstrate that this species clearly differs from all known dichobunoids, including Pak kokuhyus lahirii. Siamotherium pondaungensis is one of the Pondaung anthracotheres for which most complete cranial and dental material is known, and a phylogenetic analysis supports the basal-most position of Siamotherium within the hippopotamoids.
Journal of Vertebrate Paleontology, 2020
The Galericinae are a group of Erinaceidae that are currently distributed in Southeast and Easter... more The Galericinae are a group of Erinaceidae that are currently distributed in Southeast and Eastern Asia. Although galericines have an Asian origin, their fossil record in this region is scarce, which greatly limits the knowledge of the evolutionary history of this group. We describe here the first fossils of Eulipotyphla from the middle Miocene (13.4-13.2 Ma) of the Mae Moh Basin of northern Thailand, and assign the material to three taxa of Erinaceidae attributable to the Galericinae (Galerix rutlandae, Lantanotherium anthrace, sp. nov., and Lantanotherium sp.). The Mae Moh erinaceids present a Lantanotherium-Galerix association that is uncommon in the Miocene of Asia. Galerix rutlandae is a species formerly described in the Siwaliks of Pakistan and India, which reaffirms the strong affinities during the middle Miocene between the mammalian faunas of Southeast and Southern Asia. The discovery of two species of Lantanotherium in Mae Moh provides additional knowledge about the evolution in Asia of this widespread Miocene genus that had never been recorded in Southeast Asia. The presence of three Galericinae in Mae Moh Basin reinforces the hypothesis of a mainly closed and wet environment during the deposition of the K and Q lignite layers.
MorphoMuseuM, 2020
The present 3D Dataset contains the 3D models described and figured in the following publication:... more The present 3D Dataset contains the 3D models described and figured in the following publication: Grohé et al. 2020, the late middle Miocene Mae Moh Basin of northern Thailand: the richest Neogene assemblage of Carnivora from Southeast Asia and a paleobiogeographic analysis of Miocene Asian carnivorans. American Museum Novitates.
HAL (Le Centre pour la Communication Scientifique Directe), 1992
Bulletin du Service Géologique de l'Algérie, 2003
Neues Jahrbuch für Geologie und Paläontologie, Aug 1, 1990
European geosciences union general assembly, Apr 23, 2017
HAL (Le Centre pour la Communication Scientifique Directe), 2005
HAL (Le Centre pour la Communication Scientifique Directe), Oct 10, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Sep 24, 2012
HAL (Le Centre pour la Communication Scientifique Directe), Mar 11, 2013
HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2014
International audienc
Spiny miceofthegenus Acomys traditionally havebeenclassified asmembers oftheMurinae, asubfamily o... more Spiny miceofthegenus Acomys traditionally havebeenclassified asmembers oftheMurinae, asubfamily of rodents that also includes ratsandmicewithwhich spiny mice share acomplex setofmorphological characters, including a unique molar pattern. Theorigin andevolution ofthis molar pattern, documented bymanyfossils fromSouthern Asia, support thehypothesis ofthemonophyly ofAcomys andail other Murinae. Thisviewhasbeenchallenged byimmunolog- ical studies thathavesuggested thatAcomysisasdistantly related tomice(Mus) asareother subfamilies (e.g., hamsters: Cricetinae) ofthemuroidrodents. We present molecular evidence derived fromDNADNA hybridization datathat in- dicate that thespiny mouseAcomys andtwoAfrican genera of Murinae, Uranomys andLophuromys, constitute amonophyl- etic clade, aviewthat wasrecently suggested onthebasis of dental characters. However, ourDNADNA hybridization data alsoindicate thatthespiny mice(Acomys) aremoreclosely related togerbils (Gerbillinae) thantothetruemiceandrats (M...
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Papers by Jean-Jacques Jaeger