{"title":"FELDSPARS IN THE TERRIGENOUS SEDIMENTARY ROCKS OF ESTONIA ACCORDING TO X-RAY STRUCTURAL ANALYSIS","authors":"T. Kallaste, E. Pirrus","doi":"10.3176/geol.1994.1.04","DOIUrl":"https://doi.org/10.3176/geol.1994.1.04","url":null,"abstract":"","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134562103","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}
O. Kossovaya, E. A. Guseva, Alexander E. Lukin, Andrei V. Zhuravlev
Biotic and abiotic changes established in the middle Artinskian of several sections of the northern Timan and the western slope of the Central Urals are discussed. Data on the distribution of corals, composition of the biota as a whole, palaeotemperature and microfacies changes are presented for the first time. The determination of the stratigraphic levels is based on the new and revised biostratigraphic data. The palaeotemperature decline coincides with the maximal flooding surface and is considered as a possible cause of the ecological event triggering the turnover or extinction of many faunal groups. The event level was recognized in the coeval deposits along the Pangea shelves.
{"title":"MIDDLE ARTINSKIAN (EARLY PERMIAN) ECOLOGICAL EVENT: A CASE STUDY OF THE URALS AND NORTHERN TIMAN","authors":"O. Kossovaya, E. A. Guseva, Alexander E. Lukin, Andrei V. Zhuravlev","doi":"10.3176/geol.2001.2.03","DOIUrl":"https://doi.org/10.3176/geol.2001.2.03","url":null,"abstract":"Biotic and abiotic changes established in the middle Artinskian of several sections of the northern Timan and the western slope of the Central Urals are discussed. Data on the distribution of corals, composition of the biota as a whole, palaeotemperature and microfacies changes are presented for the first time. The determination of the stratigraphic levels is based on the new and revised biostratigraphic data. The palaeotemperature decline coincides with the maximal flooding surface and is considered as a possible cause of the ecological event triggering the turnover or extinction of many faunal groups. The event level was recognized in the coeval deposits along the Pangea shelves.","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131463948","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}
Different aspects of intraspecific variation in Wenlock tabulate corals are discussed. Intracorallum and intraspecific variation is demonstrated in specimens within the collection from one locality. The diagnostic characters of Halysites senior Klaamann and Catenipora oriens Klaamann and those of Paleofavosites secundus (Klaamann) and Favosites jaaniensis Sokolov overlap and therefore these species are regarded as synonyms. Propora raricellata Sokolov is a possible synonym of P. tubulata (Lonsdale), because the character differentiating these species is variable.
{"title":"Intraspecific variation in Wenlock tabulate corals from Saaremaa (Estonia) and its taxonomic implications","authors":"M. Mõtus","doi":"10.3176/geol.2006.1.02","DOIUrl":"https://doi.org/10.3176/geol.2006.1.02","url":null,"abstract":"Different aspects of intraspecific variation in Wenlock tabulate corals are discussed. Intracorallum and intraspecific variation is demonstrated in specimens within the collection from one locality. The diagnostic characters of Halysites senior Klaamann and Catenipora oriens Klaamann and those of Paleofavosites secundus (Klaamann) and Favosites jaaniensis Sokolov overlap and therefore these species are regarded as synonyms. Propora raricellata Sokolov is a possible synonym of P. tubulata (Lonsdale), because the character differentiating these species is variable.","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131930837","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}
I. Fabricius, U. Korsbech, V. Rastenienė, A. Shogenova, S. Šliaupa
{"title":"Glauconitic rocks in the Baltic area: estimation of specific surface","authors":"I. Fabricius, U. Korsbech, V. Rastenienė, A. Shogenova, S. Šliaupa","doi":"10.3176/geol.2003.2.01","DOIUrl":"https://doi.org/10.3176/geol.2003.2.01","url":null,"abstract":"","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133817714","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}
. A new modified Holocene stratigraphical chart for the continental and marine deposits is presented. The chronozone boundaries are correlated with those of the Nordic countries and instead of pollen zones pollen assemblage zones are proposed. As the latter are time-transgressive, they are not strictly bound up with the chronozones. For the marine deposits it is suggested to use local units until the acceptance of the generally approved standard subdivision.
{"title":"A NEW VERSION OF THE HOLOCENE STRATIGRAPHY IN ESTONIA","authors":"IN Estonia, A. Raukas, L. Saarse, S. Veski","doi":"10.3176/geol.1995.4.01","DOIUrl":"https://doi.org/10.3176/geol.1995.4.01","url":null,"abstract":". A new modified Holocene stratigraphical chart for the continental and marine deposits is presented. The chronozone boundaries are correlated with those of the Nordic countries and instead of pollen zones pollen assemblage zones are proposed. As the latter are time-transgressive, they are not strictly bound up with the chronozones. For the marine deposits it is suggested to use local units until the acceptance of the generally approved standard subdivision.","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133966326","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}
It is customary to utilize the Earth's artificial satellites for detecting long-wavelength components of the Earth's gravity field. The tracking data of the GRACE twin-satellites are the basis of t ...
{"title":"Effect of the GRACE satellite mission on gravity field studies in Fennoscandia and the Baltic Sea region","authors":"A. Ellmann","doi":"10.3176/geol.2004.2.01","DOIUrl":"https://doi.org/10.3176/geol.2004.2.01","url":null,"abstract":"It is customary to utilize the Earth's artificial satellites for detecting long-wavelength components of the Earth's gravity field. The tracking data of the GRACE twin-satellites are the basis of t ...","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133532164","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":"MULTIVARIATE ANALYSIS OF THVERARTINDUR CLINOPYROXENES, SE ICELAND","authors":"A. Soesoo","doi":"10.3176/geol.1996.3.01","DOIUrl":"https://doi.org/10.3176/geol.1996.3.01","url":null,"abstract":"","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122766287","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}
Changes in ostracode diversity and mineralogical composition of insoluble residue were studied to document environmental and biological events in the Volkhov succession of North Estonia. The most prominent bioevents occur in the basal and middle parts of the stage. The higher quartz1K-feldspar ratio in silt fraction of insoluble residue of the early Volkhov carbonates is interpreted as indicative of extensive reworking and redeposition of Cambrian-earliest Ordovician terrigenous formations. The data are discussed in the context of different models of sea level changes.
{"title":"VOLKHOV STAGE IN NORTH ESTONIA AND SEA LEVEL CHANGES","authors":"L. Ainsaar","doi":"10.3176/geol.1998.3.02","DOIUrl":"https://doi.org/10.3176/geol.1998.3.02","url":null,"abstract":"Changes in ostracode diversity and mineralogical composition of insoluble residue were studied to document environmental and biological events in the Volkhov succession of North Estonia. The most prominent bioevents occur in the basal and middle parts of the stage. The higher quartz1K-feldspar ratio in silt fraction of insoluble residue of the early Volkhov carbonates is interpreted as indicative of extensive reworking and redeposition of Cambrian-earliest Ordovician terrigenous formations. The data are discussed in the context of different models of sea level changes.","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"217 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115572283","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":"CURRENT STATE AND NEW TRENDS IN THE QUATERNARY GEOLOGY OF THE BALTIC STATES","authors":"O. Aboltiņš, A. Gaigalas, A. Raukas","doi":"10.3176/geol.1995.1.01","DOIUrl":"https://doi.org/10.3176/geol.1995.1.01","url":null,"abstract":"","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114823334","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":"SOME BRACHIOPOD GENERA OF THE SUBFAMILY STROPHOMENINAE FROM THE ORDOVICIAN OF ESTONIA","authors":"A. Rõõmusoks","doi":"10.3176/geol.1993.3.02","DOIUrl":"https://doi.org/10.3176/geol.1993.3.02","url":null,"abstract":"","PeriodicalId":237994,"journal":{"name":"Proceedings of the Estonian Academy of Sciences. Geology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115470703","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}
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