Pub Date : 1999-01-30DOI: 10.37570/bgsd-1998-45-18
M. Gektidis, Gektidis
The importance of euendolithic microbial communities as a palaeontological tool for the reconstruction of ancient sedimentary basin history has been widely ac- knowledged (Golubic et al. 1975, 1984, Vogel et al. 1995, 1996). This tool can be improved by better knowledge of the relationship between modern microendoliths (rock-penetrating microorganisms) and the environmental conditions they thrive in. The aim of a long-term study conducted on Lee Stocking Island, Bahamas, was to point out factors that control occurrence, distribution and composition of microbial euendolithic populations. The experimental design and first results are published in Radtke 1993, Kiene et al. 1995, Vogel et al. 1996, Gektidis 1997. This paper deals with one aspect of microendolithic development: the progress and change of community structure in time. Microendolithic biocoenoses are excellent bathymetric indicators (Golubic 1975, Gektidis 1997). However their potential use as indicators for different water depths is influenced by the continuous growth of the endolithic communities themselves and the surrounding benthic microflora. This process will have to be taken into consideration when, following a uniformitarian approach, fossil basins are to be reconstructed by analyzing the fossil microendolithic ichno-communities.
中石器时代微生物群落作为重建古沉积盆地历史的古生物学工具的重要性已得到广泛的认识(Golubic et al. 1975,1984; Vogel et al. 1995,1996)。通过更好地了解现代微壁岩(穿岩微生物)与它们生长的环境条件之间的关系，可以改进这一工具。在巴哈马Lee Stocking岛进行的一项长期研究的目的是指出控制微生物中新石器种群发生、分布和组成的因素。实验设计和初步结果发表在Radtke 1993, Kiene et al. 1995, Vogel et al. 1996, Gektidis 1997。本文研究了微内石器时代发展的一个方面:群落结构在时间上的进展和变化。微内石器生物群落是极好的测深指标(Golubic 1975, Gektidis 1997)。然而，它们作为不同水深指标的潜在用途受到内石器群落本身和周围底栖微生物群持续增长的影响。当按照均变说的方法，通过分析化石微内石器时代的生物群落来重建化石盆地时，必须考虑到这一过程。
{"title":"Development of microbial euendolithic communities: The influence of light and time","authors":"M. Gektidis, Gektidis","doi":"10.37570/bgsd-1998-45-18","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-18","url":null,"abstract":"The importance of euendolithic microbial communities as a palaeontological tool for the reconstruction of ancient sedimentary basin history has been widely ac- knowledged (Golubic et al. 1975, 1984, Vogel et al. 1995, 1996). This tool can be improved by better knowledge of the relationship between modern microendoliths (rock-penetrating microorganisms) and the environmental conditions they thrive in. \u0000The aim of a long-term study conducted on Lee Stocking Island, Bahamas, was to point out factors that control occurrence, distribution and composition of microbial euendolithic populations. The experimental design and first results are published in Radtke 1993, Kiene et al. 1995, Vogel et al. 1996, Gektidis 1997. This paper deals with one aspect of microendolithic development: the progress and change of community structure in time. Microendolithic biocoenoses are excellent bathymetric indicators (Golubic 1975, Gektidis 1997). However their potential use as indicators for different water depths is influenced by the continuous growth of the endolithic communities themselves and the surrounding benthic microflora. This process will have to be taken into consideration when, following a uniformitarian approach, fossil basins are to be reconstructed by analyzing the fossil microendolithic ichno-communities.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69889014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-30DOI: 10.37570/bgsd-1998-45-21
J. Martinell, R. Domènech, G. Bromley
Well-hidden beneath the umbo ofheterodont bivalves, a sack-like boring is etched into the two hinge plates of the opposed valves. The boring is abundant, occurs in numerous host species, ranges from Eocene to today and appears to have worldwide occurrence. The trace fossil is named Umbichnus inopinatus nov. igen. et isp. The nature of the tracemaker remains unknown. The possibility that the structure is a dissolution pit produced by the bivalve itself is discussed.
{"title":"Mysterious boring hidden within the hinge plates of heterodont bivalves","authors":"J. Martinell, R. Domènech, G. Bromley","doi":"10.37570/bgsd-1998-45-21","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-21","url":null,"abstract":"Well-hidden beneath the umbo ofheterodont bivalves, a sack-like boring is etched into the two hinge plates of the opposed valves. The boring is abundant, occurs in numerous host species, ranges from Eocene to today and appears to have worldwide occurrence. The trace fossil is named Umbichnus inopinatus nov. igen. et isp. The nature of the tracemaker remains unknown. The possibility that the structure is a dissolution pit produced by the bivalve itself is discussed.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69889263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-30DOI: 10.37570/bgsd-1998-45-25
R. Mikuláš
Rate ofbioerosion in some subaerial settings may compete with that of marine bioerosion. Chief agents are plant root activity and microbe metabolism. How- ever, locally, insects may mine sandstone to produce nesting galleries, while tree trunks, moving in storms, may abrade distinctive and long-lasting grooves in the rock. Examples are described from the Quaternary of the Czech Republic.
{"title":"Subaerial animal and plant bioerosion in castellated sandstone rocks (Pleistocene to Recent, Czech Republic)","authors":"R. Mikuláš","doi":"10.37570/bgsd-1998-45-25","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-25","url":null,"abstract":"Rate ofbioerosion in some subaerial settings may compete with that of marine bioerosion. Chief agents are plant root activity and microbe metabolism. How- ever, locally, insects may mine sandstone to produce nesting galleries, while tree trunks, moving in storms, may abrade distinctive and long-lasting grooves in the rock. Examples are described from the Quaternary of the Czech Republic.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69889126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1999-01-30DOI: 10.37570/bgsd-1998-45-17
I. Glaub, I. Glaub
Ichnotaxonomic and paleoecological studies on Jurassic samples resulted in the identification of four micro boring assemblages, called index ichnocoenoses. They are related to specific photic zones or subzones, and therefore are extraordinarily useful for bathymetric reconstructions.
{"title":"Paleobathymetric reconstructions and fossil microborings","authors":"I. Glaub, I. Glaub","doi":"10.37570/bgsd-1998-45-17","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-17","url":null,"abstract":"Ichnotaxonomic and paleoecological studies on Jurassic samples resulted in the identification of four micro boring assemblages, called index ichnocoenoses. They are related to specific photic zones or subzones, and therefore are extraordinarily useful for bathymetric reconstructions.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-09-25DOI: 10.37570/bgsd-1998-45-12
P. F. Konradi, C. Clausen
The 6th Joint Meeting of the Regional Committee on Northern Neogene Stratigraphy and the Regional Committee on Northern Paleogene Stratigraphy was held in Denmark on 1-5 September 1997. The meeting and the subsequent excursion were organised by Peter Konradi and Claus Heilmann-Clausen. ..
{"title":"RCNPS/RCNNS 6th Joint Annual Meeting in Denmark","authors":"P. F. Konradi, C. Clausen","doi":"10.37570/bgsd-1998-45-12","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-12","url":null,"abstract":"The 6th Joint Meeting of the Regional Committee on Northern Neogene Stratigraphy and the Regional Committee on Northern Paleogene Stratigraphy was held in Denmark on 1-5 September 1997. The meeting and the subsequent excursion were organised by Peter Konradi and Claus Heilmann-Clausen. ..","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1998-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-09-25DOI: 10.37570/BGSD-1998-45-03
J. Jagt, B. Andersen, S. L. Jakobsen, J. Wm
The present record from the white chalk of Holtug (Stevns Klint, Sjaelland) of the smali, distinctive phymosomatid echinoid Gauthieria altema (Kutscher, 1985) constitutes a notable addition to the latest Maastrichtian echinoid faunas in Denmark. Although both specimens available are crushed, preservation on the whole is better than the type material from the upper Lower Maastrichtian of Rugen (northeast Germany), and enables a more detailed description of the species, which was originally placed in Hemithylus Arnaud, 1896 but which is here transferred to the genus Gauthieria Lambert, 1888. One of the specimens preserves a single demipyramid and epiphysis of the lantern.
{"title":"THE ECHINOID GAUTHIERIA ALTERNA FROM THE UPPERMOST MAASTRICHTIAN OF DENMARK","authors":"J. Jagt, B. Andersen, S. L. Jakobsen, J. Wm","doi":"10.37570/BGSD-1998-45-03","DOIUrl":"https://doi.org/10.37570/BGSD-1998-45-03","url":null,"abstract":"The present record from the white chalk of Holtug (Stevns Klint, Sjaelland) of the smali, distinctive phymosomatid echinoid Gauthieria altema (Kutscher, 1985) constitutes a notable addition to the latest Maastrichtian echinoid faunas in Denmark. Although both specimens available are crushed, preservation on the whole is better than the type material from the upper Lower Maastrichtian of Rugen (northeast Germany), and enables a more detailed description of the species, which was originally placed in Hemithylus Arnaud, 1896 but which is here transferred to the genus Gauthieria Lambert, 1888. One of the specimens preserves a single demipyramid and epiphysis of the lantern.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"45 1","pages":"23-26"},"PeriodicalIF":1.2,"publicationDate":"1998-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-28DOI: 10.37570/bgsd-1998-44-16
W. Christensen
{"title":"Editors Column: 'Tertiary', an informal term","authors":"W. Christensen","doi":"10.37570/bgsd-1998-44-16","DOIUrl":"https://doi.org/10.37570/bgsd-1998-44-16","url":null,"abstract":"","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1998-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-12-31DOI: 10.37570/bgsd-1996-43-18
John A. Korstgard
{"title":"Gunnar Larsen Symposium","authors":"John A. Korstgard","doi":"10.37570/bgsd-1996-43-18","DOIUrl":"https://doi.org/10.37570/bgsd-1996-43-18","url":null,"abstract":"","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1996-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-12-31DOI: 10.37570/bgsd-1998-45-13
R. Bromley
The First International Bioerosion Workshop was held, under the auspices of Geological Institute of the University of Copenhagen, Denmark, at Limensgade Windmill, Aakirkeby, Bornholm in September 1996....
{"title":"Bioerosion: a collection of workshop papers","authors":"R. Bromley","doi":"10.37570/bgsd-1998-45-13","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-13","url":null,"abstract":"The First International Bioerosion Workshop was held, under the auspices of Geological Institute of the University of Copenhagen, Denmark, at Limensgade Windmill, Aakirkeby, Bornholm in September 1996....","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1996-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1996-12-31DOI: 10.37570/bgsd-1996-43-19
Arne Dinesen
{"title":"Comments on Gunnar Larsen's publications","authors":"Arne Dinesen","doi":"10.37570/bgsd-1996-43-19","DOIUrl":"https://doi.org/10.37570/bgsd-1996-43-19","url":null,"abstract":"","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"1996-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69887968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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