No description available.

No description available.

The project has involved the revision of the stratigraphy of the upper part of the Ordovician succession in central Portugal. Using evidence derived principally from the study of measured sections, with some limited geological mapping, this thesis first considers a new lithostratigraphy of the upper Ordovician deposits. The scheme presented includes four groups, twelve formations and eleven members. Most of the elements of the scheme are described here for the first time. The sedimentology of the deposits has been studied to allow an interpretation of the depositional environment. The history of sedimentation in the upper Ordovician is divided into three broad phases. In the first of these (phase A) storm-dominated deposition of detrital clastics took place on a wide, flat, shallow shelf. During the second phase (B) a localised area of igneous activity developed in the area of highest subsidence seen in the preceding phase. This igneous activity was accompanied by the deposition of some carbonate sediments. The third phase of deposition (C) is linked to the effects of the upper Ordovician glaciation. A review of most of the macrofauna recovered 1s given. The faunas of Portugal form a highly distinct and homogeneous "province" with those of Armorica, Spain, Sardinia. The palaeoecology of the faunas Montagne Noire and collected during this study are discussed. Thirteen broad associations (sensu Lockley 1983) are identified. Factors other than latitude-related influences play an important role in controlling the diversity, abundance and taxonomic constitution of the palaeocommunities. Twelve biozones are erected to cover the range of fossiliferous Ordovician strata examined in this project. The correlation between the biostratigraphie scheme erected herein and the international standard is discussed. An overview attempts to place the study area within the context of the peri-Gondwana shelf, and within the Variscan fold-belt.

No description available.

A taxonomic and biostratigraphic study of Middle Jurassic (mainly Bathonian) ostracods from southern England and northern France is here presented. A fauna of 111 species of 55 genera, belonging to the Order Podocopida, is described. Thirty four species, 3 genera, Strictocythere, Angliaecytheridea and Konarocythereis and 1 subgenus, Blanoacanthocythere, are new; a further 11 species are left under open nomenclature owing to lack of material. The biostratigraphic application of the ostracods is a continuation of the work of Bate (1978) in constructing a zonation scheme based on ostracods for the correlation of the English Bathonian. Such a zonation is necessary because of the rarity, and often absence, of ammonites within the Stage and because of the highly complex interfingering of facies belts, making correlation on lithologies very tenuous. The Zones are named, fully defined and applied to a much wider geographical area than before. These are the rimosa, confossa, polonica, blakeana, and falcata Zones, the lowermost rimosa Zone (commencing in the topmost Bajocian) being sub-divided into the rimosa, batei, and postangusta Subzones. Considered as time Zones they are shown to be highly reliable in dating sediments of varying facies and to permit a direct correlation of the beds in southern England with those of northern France. On the basis of the zonation two lithostratigraphic units in the French succession, the Calcaire de Reviers and the Caillasse de Fontaine-Henry are no longer considered valid as discrete units and are regarded as being equivalent to the Calcaire de Blainville and the Caillasse de Blainville respectively. Certain discrepancies in the ostracod faunas are seen between the areas sampled and these are used to construct a slightly modified palaeogeographic interpretation to that currently accepted.

Made available in DSpace on 2014-06-11T19:26:15Z (GMT). No. of bitstreams: 0 Previous issue date: 2003-04-14Bitstream added on 2014-06-13T18:29:46Z : No. of bitstreams: 1 longhim_me_me_rcla.pdf: 3997492 bytes, checksum: 0d698e3c432ce390fe5d3075c45a653d (MD5) / Realizou-se um estudo palinológico detalhado de ritmitos do Grupo Itararé inferior a médio (Supergrupo Tubarão) no entroncamento das rodovias SP-75 e SP-308, em Salto, SP (coord. UTM 23K 262,095kmE/ 7.432,774kmN). Os ritmitos correspondem a turbiditos com seixos caídos (dropstones), depositados em ambiente glacial, provavelmente marinho. Ocorrem parcialmente invertidos devido a deslizamentos gravitacionais subaquáticos. Incluem também megásporos, atribuíveis a licófitas, e musgos fósseis pouco transportados, derivados de possíveis tundras. São registradas 58 espécies de palinomorfos (29 de esporos, 26 de grãos de pólen, duas de algas e uma de possível acritarca). Dois gêneros e cinco espécies são inéditos na Bacia do Paraná: Jayantisporites Butterworth et al., 1964; Meristocorpus Playford & Dino, 2000; Apiculiretusispora tuberculata Azcuy, 1975; Apiculiretusispora alonso Ottone, 1989; Cyclogranisporites cf. C. microgranulatus (Menéndez & Azcuy) Archangelsly & Gamerro, 1979, Tetraporina punctata (Tiwari & Navale) Kar & Bose, 1976 e Hamiapollenites cf. H. insolitus (Bharadwaj & Salujha) Balme, 1970; a última já foi registrada no Grupo Itararé, porém sob outra denominação. A assembléia palinológica corresponde à Palinozona Crucisaccites monoletus de Souza & Marques-Toigo (2001), aproximadamente equivalente aos intervalos informais G (exceto sua porção basal) + H1 + H2 de Daemon & Quadros (1970). Comparações com assembléias gondvânicas, principalmente argentinas, confirmaram a idade neocarbonífera (Westphaliano final-Stephaniano) sugerida por Souza (2000) para a palinozona. / A detailed palynological study was done of the lower to middle Itararé Group (Tubarão Supergroup) rhythmites at the meeting of the SP-75 e SP-308 roads, in Salto, SP (UTM coord. 23K 262,O95kmE/7.432,77kmN). The rhythmites are turbidites with dropstones, from a probable marine glacial environment. They were partially inverted by subaquatie gravitational sliding. They also include little transported megaspores of lycopod affinity and fossil mosses from a possible tundra. A total of 58 palynomorph species were found (29 spore, 26 poilen, two alga! and one possible acritarcha species). Two genera and five species were identified for the first time in the Pai-anã Basin: Jayantisporites Butterworth et ai., 1964; Merístocorpus Playford & Dino, 2000; Apiculiretusispora tuberculata Azcuy, 1975; Apiculiretusispora alonso Ottone, 1989; Cyciogranisporites cf. C. microgranulatus (Menéndez & Azcuy) Archangelsly & Gamerro, 1979, Tetraporina punctata (Tiwan & Navale) Kar & Bose, 1976 and Hamiapoilenites cf. H. insolitus (Bharadwaj & Salujha) Balme, 1970. The last species was already known iii the Itararé Group, but under another designation. The palynological assembiage corresponds to the Crucísaccites monoletus Palynozone proposed by Souza & Marques-Toigo (2001), which is approximately equivalent to the informal biostratigraphic intervais G (except its basal portion) + H1 + H2 of Daemon & Quadros (1970). Comparísons with gondwanic assemblages, specially from Argentina, confirm the Late Carboniferous (late Westphalian-Stephanian) age suggested by Souza (2000) for the palynozone. Keywords: Palynology, Biostratigraphy, Upper Carboniferous, Paraná Basin, ltararé Group.

No description available.

No description available.

No description available.

Orientador: Rosemarie Rohn Davies / Banca: Mary Elizabeth C. Bernardes de Oliveira / Banca: Joel Carneiro de Castro / Resumo: Realizou-se um estudo palinológico detalhado de ritmitos do Grupo Itararé inferior a médio (Supergrupo Tubarão) no entroncamento das rodovias SP-75 e SP-308, em Salto, SP (coord. UTM 23K 262,095kmE/ 7.432,774kmN). Os ritmitos correspondem a turbiditos com seixos "caídos" (dropstones), depositados em ambiente glacial, provavelmente marinho. Ocorrem parcialmente invertidos devido a deslizamentos gravitacionais subaquáticos. Incluem também megásporos, atribuíveis a licófitas, e musgos fósseis pouco transportados, derivados de possíveis tundras. São registradas 58 espécies de palinomorfos (29 de esporos, 26 de grãos de pólen, duas de algas e uma de possível acritarca). Dois gêneros e cinco espécies são inéditos na Bacia do Paraná: Jayantisporites Butterworth et al., 1964; Meristocorpus Playford & Dino, 2000; Apiculiretusispora tuberculata Azcuy, 1975; Apiculiretusispora alonso Ottone, 1989; Cyclogranisporites cf. C. microgranulatus (Menéndez & Azcuy) Archangelsly & Gamerro, 1979, Tetraporina punctata (Tiwari & Navale) Kar & Bose, 1976 e Hamiapollenites cf. H. insolitus (Bharadwaj & Salujha) Balme, 1970; a última já foi registrada no Grupo Itararé, porém sob outra denominação. A assembléia palinológica corresponde à Palinozona Crucisaccites monoletus de Souza & Marques-Toigo (2001), aproximadamente equivalente aos intervalos informais G (exceto sua porção basal) + H1 + H2 de Daemon & Quadros (1970). Comparações com assembléias gondvânicas, principalmente argentinas, confirmaram a idade neocarbonífera (Westphaliano final-Stephaniano) sugerida por Souza (2000) para a palinozona. / Abstract: A detailed palynological study was done of the lower to middle Itararé Group (Tubarão Supergroup) rhythmites at the meeting of the SP-75 e SP-308 roads, in Salto, SP (UTM coord. 23K 262,O95kmE/7.432,77kmN). The rhythmites are turbidites with dropstones, from a probable marine glacial environment. They were partially inverted by subaquatie gravitational sliding. They also include little transported megaspores of lycopod affinity and fossil mosses from a possible tundra. A total of 58 palynomorph species were found (29 spore, 26 poilen, two alga! and one possible acritarcha species). Two genera and five species were identified for the first time in the Pai-anã Basin: Jayantisporites Butterworth et ai., 1964; Merístocorpus Playford & Dino, 2000; Apiculiretusispora tuberculata Azcuy, 1975; Apiculiretusispora alonso Ottone, 1989; Cyciogranisporites cf. C. microgranulatus (Menéndez & Azcuy) Archangelsly & Gamerro, 1979, Tetraporina punctata (Tiwan & Navale) Kar & Bose, 1976 and Hamiapoilenites cf. H. insolitus (Bharadwaj & Salujha) Balme, 1970. The last species was already known iii the Itararé Group, but under another designation. The palynological assembiage corresponds to the Crucísaccites monoletus Palynozone proposed by Souza & Marques-Toigo (2001), which is approximately equivalent to the informal biostratigraphic intervais G (except its basal portion) + H1 + H2 of Daemon & Quadros (1970). Comparísons with gondwanic assemblages, specially from Argentina, confirm the Late Carboniferous (late Westphalian-Stephanian) age suggested by Souza (2000) for the palynozone. Keywords: Palynology, Biostratigraphy, Upper Carboniferous, Paraná Basin, ltararé Group. / Mestre