Journal of Palaeosciences最新文献

{"title":"Aeschynomene tertiara, a new fossil wood from the Deccan Intertrappean beds at Mahurzari near Nagpur, India","authors":"U. Prakash","doi":"10.54991/jop.1962.613","DOIUrl":"https://doi.org/10.54991/jop.1962.613","url":null,"abstract":"A new species of Aeschynomene, A. tertiara is described here from the Intertrappean beds of Mahurzari near Nagpur. The present finding forms the first fossil record of this genus. It is represented by about 300 modern species and is chiefly a tropical genus with a few species occurring in warm temperate areas. About one half of the species are hydrophytes found in marshes, mud holes, wet meadows, and along stream banks.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129334317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Orientation of quartz grains in some Indian silicified woods","authors":"J. Sen.","doi":"10.54991/jop.1955.473","DOIUrl":"https://doi.org/10.54991/jop.1955.473","url":null,"abstract":"The quartz fabric of some underformed Indian silicified woods has been studied. All the fabric diagrams show girdles - preferred orientation girdling round the longitudinal axis of the tree trunks. The diagrams are of growth fabric determined by the anisotropy of the wood itself. The main principle involved is that the symmetry of the original wood structure should be preserved in the symmetry of the dimensional and the lattice patterns of the quartz fabric. \u0000The dissolved silicates enter the original wood through pore solution. They possibly crystallize by some sort of 'mimetic' crystallization.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"74 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114117249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Birbal Sahni","authors":"R.R. Sreshta","doi":"10.54991/jop.1952.404","DOIUrl":"https://doi.org/10.54991/jop.1952.404","url":null,"abstract":"<jats:p>na</jats:p>","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134264024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A petrified palm wood from the Deccan Intertrappean beds of Malchalma, Medak District, Andhra Pradesh, India","authors":"R. S. Patil","doi":"10.54991/jop.2008.260","DOIUrl":"https://doi.org/10.54991/jop.2008.260","url":null,"abstract":"<jats:p>na</jats:p>","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133274803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Third Proficiency Course on Modern Practices in Petroleum Exploration - A report","authors":"Subarna Tripathi","doi":"10.54991/jop.2007.66","DOIUrl":"https://doi.org/10.54991/jop.2007.66","url":null,"abstract":"<jats:p>NA</jats:p>","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122367040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palynostratigraphic, palaeoenvironmental and palaeogeographic significance of the Early Cretaceous palynoflora of Kachchh Basin, western India","authors":"Madhav Kumar","doi":"10.54991/jop.2018.48","DOIUrl":"https://doi.org/10.54991/jop.2018.48","url":null,"abstract":"Sediments of Bhuj Formation (Early Cretaceous) occur in the Kachchh Basin, western India containing abundant and diverse plant fossils. Sedimentary successions of the formation exposed along Pur River comprise variably thickened shale, carbonaceous shale, thin coal seam, siliceous clays, etc. and have yielded abundant megaspores, microspores, conifer pollen grains, dinoflagellate cysts and colonies of Botryococcus alga. Two palynozones are recognized in the recorded palynoassemblage, viz. Minerisporites cutchensis megaspore zone at the basal part, derived mostly from herbaceous vegetation growing along pro–deltaic swampy habitat. The succeeding Araucariacites australis zone in the upper part of the succession probably derived from conifer–dominated forest inhabited along the freshwater swamps, flourishing in a more humid and warm temperate climate. The palynofloras of both palynozones are biostratigraphically very significant indicating Late Aptian–Early Albian age of the succession. A majority of the palynotaxa recorded from the studied sedimentary succession show resemblance with the contemporaneous deposits of other Gondwana continents of the Southern Hemisphere.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123940233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Eocene calcareous Nannofossil Biostratigraphy and Taxonomy of onland Kutch Basin, western India","authors":"J. Rai","doi":"10.54991/jop.2007.61","DOIUrl":"https://doi.org/10.54991/jop.2007.61","url":null,"abstract":"Rich and diversified nannofossil assemblage comprising 110 species (13 new species and 8 new taxonomic combinations) and 4 calcareous dinoflagellates species are described from the type locality of Harudi Formation and Fulra Limestone Fonnation of Kutch Basin. The assemblage is dominated by the families Braarudosphaeraceae, Rhabdosphaeraceae and Calyptrosphaeraceae. All holococcolith genera except genus Peritrachelina are recorded in the assemblage. The assemblage is typically indicative of low-latitude, nearshore, shallow water environment and can be assigned to zone NP 17 Discoaster saipanensis Zone (Martini, 1971a emend. Rai, 1988). It also correlated with parts of both P 13 Orbulinoides beckmanni and P 14 Truncorotaloides rohri planktonic foraminifera Zones (Blow, 1969) and a part of D11 Dinoflagellate Zone (Costa & Manum in Vinken, 1988) of Bartonian age. Critical reappraisal of published fossil records including age diagnostic planktonic and larger foraminifera species and nannofossil data along with field observations of supratrappeans indicate, three discrete lithounits in ascending order viz., shale-marl-limestone upto terminal Fulra Limestone Formation.The proposed model questions the presence of marine sediments of Palaeocene, Lower Eocene and Lutetian age in onland Kutch Basin (Biswas & Raju, 1973; Biswas, 1992).","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"8 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124938224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstructing prehistoric environments in the Son and Belan valleys, north-central India: Retrospect and Prospect","authors":"Martin A. J. Williams","doi":"10.54991/jop.2021.19","DOIUrl":"https://doi.org/10.54991/jop.2021.19","url":null,"abstract":"Pioneering archaeological surveys in the Son and Belan valleys of north–central India in the 1970s revealed that these valleys had been occupied at least intermittently during the Lower Palaeolithic, Middle Palaeolithic, Upper Palaeolithic and Neolithic. Later work in the early 1980s provided a reliable stratigraphic framework for the prehistoric sites and also resulted in the chance discovery of volcanic ash erupted from Toba volcano in Sumatra, Indonesia, 74,000 years ago. The discovery of the first Quaternary volcanic ash ever found in India prompted a search for the ash across the Indian sub–continent. By the early 1990s it was apparent that the entire sub–continent had been covered in a layer of ash 10–15 cm thick. Later work showed that some of this ash had been reworked by runoff and soil creep soon after deposition and accumulated in topographic depressions and valley bottoms where it remained in a relatively pure state. However, some of the ash has been reworked more than once since first deposited. Use of the ash as an isochronous marker depends upon establishing whether it is still in primary context and if not the degree to which it has been mixed with younger sediment. A key and as yet unresolved issue is whether or not the eruption had a major or minor regional and global environmental (including climatic) impact. High resolution records from speleothems, pollen spectra, varved lake deposits and ice cores will be needed to answer this question. The presence of similar stone artefact assemblages above and beneath the ash tells us nothing useful about the actual environmental impact of the eruption.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116670986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Early Holocene pollen record of vegetation and climate history in response to the monsoonal activity in East Garo Hills, Meghalaya, India","authors":"S. K. Basumatary, S. Tripathi, S. K. Bera","doi":"10.54991/jop.2020.30","DOIUrl":"https://doi.org/10.54991/jop.2020.30","url":null,"abstract":"This study presents a palynological analysis in 2.0 m deep sedimentary soil profile procured from Rongre Swamp of East Garo Hills to document changes in vegetation and climate in response to the monsoonal activity since 10,640 cal. BP. Four palaeovegetation and climate zones were recorded based on the frequencies of major pollen taxa in the region. The first phase was around 10,640–7,540 cal. BP broadly shows the existence of tropical forest in the region under the onset of warm and humid climatic condition. Subsequently, between 7,540–5,490 cal. BP, the forest got enriched with increased values of tropical mixed deciduous and evergreen elements. The vegetation scenario as marked by both deciduous and evergreen elements in increased values support the warm and humid climate in response to the relatively high monsoonal activity. Accordingly, in the third phase between 5,490–1,120 cal. BP, the values of major arboreal pollen taxa, Shorea, Mesua, Elaeocarpus and Duabanga have declined as compared to the preceding phase in relation to the relatively less warm and humid climate than the preceding phase in the region. In the last phase around 1,120 cal. BP to present, the forest got deteriorated as evidenced by the decreased values of arboreal pollen taxa. This phase clearly depicts the high anthropogenic activity as evidenced by the abundance of cultural pollen like cereal and Brassica.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116508198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pollen evidence of vegetation succession, climatic changes and human impact in southern Madhya Pradesh during last ca 6,700 years","authors":"M. S. Chauhan, Yachana Bhandari, Anupam Sharma","doi":"10.54991/jop.2020.29","DOIUrl":"https://doi.org/10.54991/jop.2020.29","url":null,"abstract":"Pollen records of a 2.0 m deep sediment profile from Barehata Tal portray the vegetation scenarios and contemporaneous climatic events of southern Madhya Pradesh prior to Mid–Holocene. Between 6,700 and 6,015 cal yr BP, the region supported open mixed tropical deciduous forests comprising sparingly distributed trees, viz. Moringa oleifera, Acacia, Trewia nudiflora, Madhuca indica, Terminalia and Aegle marmelos under a warm and less–humid climate than today. The record of Cerealia pollen from the beginning of the pollen sequence denotes the cereal–based arable crop economy in the region. The lake did exist, but it was of small expanse as depicted by the deficient aquatic element, Potamogeton. Around 6,015 to 4,848 cal yr BP, the enhancement in Acacia, Moringa oleifera, Trewia nudiflora, Madhuca indica coupled with moderate increase in Terminalia, Aegle marmelos, Holoptelea, etc. suggest the proliferation of mixed deciduous forests with the arrival of a warm very humid climate attributed to active SW monsoon. The agrarian activities also intensified with the initiation of favourable climatic condition as testified by the increase in Cerealia and cropland weeds. The lake turned bigger in stretch as documented by the improvement in Potamogeton and Typha along with sporadic appearance of Zygnema. The abrupt decline in the number as well as frequencies of the trees existing earlier implies that the forest became sparse around 4,848 to 3,671 cal yr BP with the onset of a warm and dry climate, most likely due to weak SW monsoon. Between 3,671 and 2,450 cal yr BP, the expansion forests took place with the substantial rise of Acacia, Madhuca indica and Holoptelea and re–incursion of Tectona grandis, Buchanania lanzan, Schleichera oleosa, Schrebera, Aegle marmelos, Grewia, etc. This diversification of the forests signifies the advent of a warm and moderately–humid climate. There was augmentation in the agricultural practice and other human activities as evidenced from the consistent encounter of Cerealia and culture pollen. The lake attained a wider spread as a result of increased monsoon precipitation. Around 2,450 to 1,230 cal yr BP, the forests declined, which is manifested by the depletion in the prominent ingredients, excepting Grewia, Schleichera oleosa, Tectona grandis and Aegle marmelos. This change in the vegetation scenario reflects the prevalence of a warm and less–humid climate again. However, from 1,230 cal yr BP onwards, the enrichment of forests elucidates that a warm and humid climate prevailed in response to increased monsoon precipitation.","PeriodicalId":383463,"journal":{"name":"Journal of Palaeosciences","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127534966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}