Lecture Note 434636 Foundations on Rock

หนึ่งผลงานหนึ่งอาจารย์ประจำปี 255

Surface mining and mine design

โครงการหนึ่งอาจารย์หนึ่งผลงา

Ostracodes (Crustacea) du Permien moyen et supérieur (Cisarulien-Guadalupien) de Thaïlande centrale (Bloc d’Indochine) : 2ème partie, ordres Podocopida, Platycopida et Myodocopida

Dans ce travail, nous documentons l’abondance des ostracodes marins d’âge Permien inférieur et moyen (Cisarulien-Guadalupien) du Bloc d’Indochine en Thaïlande centrale. Vingt localités situées dans les zones de Loei, Phetchabun et Nakhon Sawan-Lopburi ont été étudiées, et des échantillons de niveaux calcaires ont été prélevés. Parmi les 135 échantillons collectés, 82 ont fourni de nombreux ostracodes, bien préservés. Dans un précédent article, 39 espèces réparties dans 20 genres de l’ordre des Palaeocopida ont été décrites. Le présent travail constitue la seconde partie de cette recension de la faune d’ostracodes. 91 espèces des ordres Podocopida, Platycopida et Myodocopida sont décrites, dont quatorze nouvelles espèces : Bairdia khaokanaensis Chitnarin, n. sp., Bairdia incisedorsa Chitnarin, n. sp., Bairdia fontainei Chitnarin, n. sp., Bairdia songthami Chitnarin, n. sp., Bairdia grotei Chitnarin, n. sp., Petasobairdia campbelli Chitnarin, n. sp., Fabalicypris hathaithipae Chitnarin, n. sp., Silenites sureeae Chitnarin, n. sp., Acratia chongpani Chitnarin, n. sp., Acratia mongkoli Chitnarin, n. sp., Liuzhinia naramasei Chitnarin, n. sp., Baschkirina ruchae Chitnarin, n. sp., Basslerella wipanuae Chitnarin, n. sp., Basslerella naresi Chitnarin, n. sp. Une analyse des affinités paléogéographiques des ostracodes découverts montre de fortes relations avec ceux du Bloc de Chine du Sud dans la Paléo-Téthys.In the present contribution, we report abundant Early to Middle Permian (Cisarulian-Guadalupian) marine ostracods of the Indochina block from Central Thailand. Twelve localities in the Loei, Phetchabun, and Nakhon Sawan-Lopburi areas were investigated and limestone samples were collected. Out of 135 samples collected, 82 yielded abundant and nicely preserved ostracods. In a first paper, 39 species of 20 genera belonging to Order Palaeocopida were already described. Here is the second part of the ostracod fauna description with 91 species of the orders Podocopida, Platycopida and Myodocopida. Fourteen species are new and described here: Bairdia khaokanaensis Chitnarin, n. sp., Bairdia incisedorsa Chitnarin, n. sp. Bairdia fontainei Chitnarin, n. sp., Bairdia songthami Chitnarin, n. sp., Bairdia grotei Chitnarin, n. sp., Petasobairdia campbelli Chitnarin, n. sp., Fabalicypris hathaithipae Chitnarin, n. sp., Silenites sureeae Chitnarin, n. sp., Acratia chongpani Chitnarin, n. sp., Acratia mongkoli Chitnarin, n. sp., Liuzhinia naramasei Chitnarin, n. sp., Baschkirina ruchae Chitnarin, n. sp., Basslerella wipanuae Chitnarin, n. sp., Basslerella naresi Chitnarin, n. sp. An analysis of the palaeogeographic affinities of the recovered ostracods shows close relationships with those found from South China Block on the Paleo-Tethys realm

Permian ostracods from limestones associated with a coal deposit, Tak Fa Formation (Guadalupian), central Thailand

International audienceThis research aims to interpret depositional environment of limestones associated with coals found in Nong Phai District, Phetchabun Province, central Thailand based on microfacies and fossil ostracods. Core samples Tak Fa Formation, assigned to late Middle Permian, were obtained in course of subsurface prospecting. Most samples were muddy limestones. Two coal seams were found at 45- and 82-meters depth. Intercalations of limestones, sandstones, shales were found above the upper coal. Limestones classified as bioclastic wackestone and packstone contain brachiopod, ostracods, gastropods, dasyclad green algae, calcispheres and smaller foraminifers. Microfacies study suggest the inner part of homoclinal ramp, from shallow marine to shoal and restricted lagoon. Thirty-three limestone samples were processed by Hot Acetolysis: they provided thirty-four species belonging to 16 genera. The Bairdioidea is dominated while Hollinoidea, Kirkbyoidea, Kloedenelloidea occur in lower proportions. The occurrence of Paleodarwinula and Carbonita? at 13 meters depth suggests the influence of freshwater influence within a shallowing sequence. In conclusion, these limestones and coals from the Tak Fa Formation seem to have accumulated in shallow to transitional marine waters. These observations may relate to the regional sea level drop during late Middle Permian (Wordian-Capitanian), coals being deposited in lagoons developed during this period

Holocene ostracods (Crustacea) from a whale-fall excavation site from the Chao Phraya delta, Central Thailand

Late Holocene ostracods were recovered from marine sediments of the Chao Phraya delta at a whale-fall excavation site located fifteen kilometers on land in the Am Pang Subdistrict, Ban Paew District, Samut Sakhon Province, north of the Gulf of Thailand. Thirteen species belonging to seven genera are identified. The deposition environment of the succession is for the first time characterized. The ostracod assemblages suggest that the entire succession associated with the whale-fall deposited in a shallow marine environment such as estuary, bay, inner shelf, subtidal, under less than 20 meters water-depth, in brackish to normal salinity with high mud content and turbidity, on a muddy substrate. This analysis is an important step toward the first in-depth study of ostracods associated with modern and fossil shallow-water whale-falls

Early to Middle Permian ostracods (crustaceans) of Indochina terrane, central and northeastern Thailand: implication for palaeobiogeography.

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Ostracods (Crustacea) of the Early-Middle Permian from Central Thailand (Indochina block). Part I. Order Palaeocopida

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