Pub Date : 1999-01-30DOI: 10.37570/bgsd-1998-45-14
S. Evans
The anatomical features and morphology and lining of the borings of woodboring bivalves are evaluated as taxobases. The aragonitic valves and pallets have poorer preservation potential than the calcitic boring linings that some forms secrete. These linings may be septate, containing retrusive caps.
{"title":"Wood-boring bivalves and boring linings","authors":"S. Evans","doi":"10.37570/bgsd-1998-45-14","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-14","url":null,"abstract":"The anatomical features and morphology and lining of the borings of woodboring bivalves are evaluated as taxobases. The aragonitic valves and pallets have poorer preservation potential than the calcitic boring linings that some forms secrete. These linings may be septate, containing retrusive caps.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888504","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-1998-45-19
C. Silva, M. Cachäo, J. Martinell, R. Domènech
Occurrences of Neogene rocky shores in Portugal have been identified by help of bioerosion trace fossils. Ichnogenera Gastrochaenolites, Entobia, Caulostrepsis, Maeandropolydora and Trypanites are generally present. The importance of bioeroded surfaces for field recognition of wave-cut platforms, hard substrate marine-flooding surfaces (transgressive surfaces), and of major interruptions (hiatuses) in the stratigraphic record is stressed.
{"title":"Bioerosional evidence of rocky palaeoshores in the N eogene of Portugal: environmental and stratigraphical significance","authors":"C. Silva, M. Cachäo, J. Martinell, R. Domènech","doi":"10.37570/bgsd-1998-45-19","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-19","url":null,"abstract":"Occurrences of Neogene rocky shores in Portugal have been identified by help of bioerosion trace fossils. Ichnogenera Gastrochaenolites, Entobia, Caulostrepsis, Maeandropolydora and Trypanites are generally present. The importance of bioeroded surfaces for field recognition of wave-cut platforms, hard substrate marine-flooding surfaces (transgressive surfaces), and of major interruptions (hiatuses) in the stratigraphic record is stressed.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69889103","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-1998-45-15
J. Nielsen
An examination of fossil and Recent right valves of the infaunal, suspensionfeeding Corbula gibba (Olivi, 1792) revealed the presence of a slender, sub- conical, unbranched boring. The boring is interpreted as the work of a commensal organism, possible a parasite. Stratigraphic range is from Eocene to Recent.
{"title":"Commensal association of Corbula gibba (Bivalvia) and a sub-conical boring","authors":"J. Nielsen","doi":"10.37570/bgsd-1998-45-15","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-15","url":null,"abstract":"An examination of fossil and Recent right valves of the infaunal, suspensionfeeding Corbula gibba (Olivi, 1792) revealed the presence of a slender, sub- conical, unbranched boring. The boring is interpreted as the work of a commensal organism, possible a parasite. Stratigraphic range is from Eocene to Recent.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888570","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-1998-45-16
K. Nielsen
Planktonic and benthonic foraminiferal tests from modem tropical-subtropical marine environments were investigated with regard to bioerosional traces. The traces found on the foraminiferal tests were grouped into 7 different categories. It is suggested that the different traces may be related to different unknown predators of which at least one is planktonic.
{"title":"Foraminiferivory revisited: a preliminary investigation of holes in foraminifera","authors":"K. Nielsen","doi":"10.37570/bgsd-1998-45-16","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-16","url":null,"abstract":"Planktonic and benthonic foraminiferal tests from modem tropical-subtropical marine environments were investigated with regard to bioerosional traces. The traces found on the foraminiferal tests were grouped into 7 different categories. It is suggested that the different traces may be related to different unknown predators of which at least one is planktonic.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69888689","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-1998-45-20
M. P. Clausade, N. Pari, V. Chazottes
On coral reefs, products of bioerosion through the activity of micro- and macro-boring organisms and grazers are particulate and dissolved carbonate. The con-tribution to bioerosion of the major boring and grazing species was estimated on French Polynesia and the island La Réunion. The influence of bioerosion on the calcification/dissolution budget of reefal waters and on particulate calcium car-bonate fluxes was investigated. Studies on bioerosion were performed in order to assess: (a) eroding activity of grazers through the gut content analysis of echinoids and scarid parrot fish, (b) eroding activity of micro- and macroborers from ex-perimental substrates exposed for one year, and (c) role of sponges in total bioero-sion on reefal and experimental substrates. Calcification/dissolution budget was measured using the alkalinity anomaly technique, and particulate carbonate pro-duction was analysed from trapped sediments.
{"title":"Bioerosion in the carbonate budget of two Indo-Pacific reefs: La Réunion (Indian Ocean) and Mooréa (Pacific Ocean)","authors":"M. P. Clausade, N. Pari, V. Chazottes","doi":"10.37570/bgsd-1998-45-20","DOIUrl":"https://doi.org/10.37570/bgsd-1998-45-20","url":null,"abstract":"On coral reefs, products of bioerosion through the activity of micro- and macro-boring organisms and grazers are particulate and dissolved carbonate. The con-tribution to bioerosion of the major boring and grazing species was estimated on French Polynesia and the island La Réunion. The influence of bioerosion on the calcification/dissolution budget of reefal waters and on particulate calcium car-bonate fluxes was investigated. Studies on bioerosion were performed in order to assess: (a) eroding activity of grazers through the gut content analysis of echinoids and scarid parrot fish, (b) eroding activity of micro- and macroborers from ex-perimental substrates exposed for one year, and (c) role of sponges in total bioero-sion on reefal and experimental substrates. Calcification/dissolution budget was measured using the alkalinity anomaly technique, and particulate carbonate pro-duction was analysed from trapped sediments.","PeriodicalId":55310,"journal":{"name":"Bulletin of the Geological Society of Denmark","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"1999-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69889156","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-1998-45-18
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":null,"pages":null},"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":null,"pages":null},"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-1998-45-17
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":null,"pages":null},"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 : 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":null,"pages":null},"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 : 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":null,"pages":null},"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}
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