Middle Permian Ostracods from Tak Fa Limestone, Phetchabun Province, Central Thailand

This paper presents the first Permian ostracod fauna discovered in Thailand. The ostracods are recovered from the Tak Fa Limestone (Middle Permian) in Phetchabun province, central Thailand. The ostracods belong to eight genera and 15 species. Four species are newly described: Sargentina phetchabunensis nov. sp., Geffenina bungsamphanensis nov. sp., Reviya subsompongensis nov. sp. and Bairdia takfaensis nov. sp. The ostracod assemblages characterize a shallow marine, near shore environment at the time of deposition. Except for one species, which shows palaeobiogeographical links between Central Thailand and South China, all the other species are endemic

Microbialites and associated facies of the Late Ordovician system in Thailand: paleoenvironments and paleogeographic implications

Department of Mineral Resources of Thailan

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

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

International audienc

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

International audienc

Invitation to Magnetism and Magentic Resonance

This paper constitutes an elementary introduction to magnetism and spin resonance