Achim Reisdorf | Ruhr Museum, Essen (original) (raw)
Papers by Achim Reisdorf
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The Geology of Central Europe Volume 2: Mesozoic and Cenozoic
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A 250 m-deep, inclined well, the Mont Terri BDB-1, was drilled through Jurassic Opalinus Clay and... more A 250 m-deep, inclined well, the Mont Terri BDB-1, was drilled through Jurassic Opalinus Clay and its bounding formations at the Mont Terri rock laboratory (NW Switzerland). A continuous section is thereby available for the first time for the Mont Terri area, from the topmost members of the Staffelegg Formation to the basal layers of the Hauptrogenstein Formation. The well core was studied extensively for lithostratigraphy and biostratigraphy (drawing upon three sections from the Mont Terri area). The macro- and micropaleontological as well as the palynostratigraphical data are complementary not only spatially but account further for almost all biozones embracing the Late Toarcian and the Early Bajocian. A suite of geophysical logs was compiled and this method permits detection of formational and intraformational boundaries in the BDB-1 well. In the framework of interdisciplinary study, analysis of the above-mentioned formations permitted straightforward processing to derive substantial new data for the Mont Terri area. Lithologic inventory, stratigraphic architecture, thickness variations and the biostratigraphic classification of the studied formations in part deviate considerably from occurrences in northern Switzerland that outcrop farther to the east. For the Passwang Formation, with the exception of the Sissach Member, no further lithostratigraphic subdivision is possible according to the members defined in the type region. Also noteworthy is that the approximately 130 mthick Opalinus Clay in drill core BDB-1 appears thinner by 20 m than that in the Mont Terri tunnel. The lowermost 38 m of the Opalinus Clay can be attributed chronostratigraphically solely to the Aalensis Zone (Late Toarcian). The accumulation of the Opalinus Clay, however, was also initiated at the same time farther east in northern Switzerland (Aalensis Subzone, Aalensis Zone), but contemporaneously in the Mont Terri area, there was a sedimentation rate two or three orders of magnitude higher.
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... 49 Page 3. 25 No Joke Movement: Mehr über den Hauensteiner Ichthyosaurier ... EMPA Dübendorf:... more ... 49 Page 3. 25 No Joke Movement: Mehr über den Hauensteiner Ichthyosaurier ... EMPA Dübendorf: A. FLISCH, A. OBRIST. Rechtsmedizin: M. BENECKE (Köln), R. BUX und F. RAMSTHALER (Frankfurt aM), H. KLOTZBACH (Ham-burg), D. WYLER (Basel). ...
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Travaux de l’Institut Scientifique, Rabat, Série Géologie et Géographie Physique, 2000
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Palaeobiodiversity and Palaeoenvironments, 2014
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Swiss Journal of Geosciences
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Swiss Journal of Geosciences
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Swiss Journal of Geosciences, 2017
A 250 m-deep inclined well, the Mont Terri BDB-1, was drilled through the Jurassic Opalinus Clay ... more A 250 m-deep inclined well, the Mont Terri BDB-1, was drilled through the Jurassic Opalinus Clay and its bounding formations at the Mont Terri rock laboratory (NW Switzerland). For the first time, a continuous section from (oldest to youngest) the topmost members of the Staffelegg Formation to the basal layers of the Hauptrogenstein Formation is now available in the Mont Terri area. We extensively studied the drillcore for lithostratigraphy and biostratigraphy, drawing upon three sections from the Mont Terri area. The macropaleontological, micropaleontological, and palynostratigraphical data are complementary, not only spatially but they also cover almost all biozones from the Late Toarcian to the Early Bajocian. We ran a suite of geophysical logs to determine formational and intraformational boundaries based on clay content in the BDB-1 well. In the framework of an interdisciplinary study, analysis of the above-mentioned formations permitted us to process and derive new and substantial data for the Mont Terri area in a straightforward way. Some parts of the lithologic inventory, stratigraphic architecture, thickness variations, and biostratigraphic classification of the studied formations deviate considerably from occurrences in northern Switzerland that crop out further to the east. For instance, with the exception of the Sissach Member, no further lithostratigraphic subdivision in members is proposed for the Passwang Formation. Also noteworthy is that the ca. 130 m-thick Opalinus Clay in the BDB-1 core is 20 m thinner than that equivalent section found in the Mont Terri tunnel. The lowermost 38 m of the Opalinus Clay can be attributed chronostratigraphically solely to the Aalensis Zone (Late Toarcian). Deposition of the Opalinus Clay began at the same time farther east in northern Switzerland (Aalensis Subzone, Aalensis Zone), but in the Mont Terri area the sedimentation rate was two or three orders of magnitude higher.
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A three-dimensional well-preserved ichthyosaur skull and parts of the postcranial skeleton are at... more A three-dimensional well-preserved ichthyosaur skull and parts of the postcranial skeleton are attributed to the species Leptonectes tenuirostris (Conybeare, 1822). It was found vertically embedded in Pliensbachian deposits representing three successive biozones (ibex to margaritatus Zone). The find is dated as early Late Pliensbachian (margaritatus Zone) by a rich ammonite and ostracod fauna. It is the first record of the
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Data Revues 00166995 00390005 0600088x, Mar 21, 2008
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The Geology of Central Europe Volume 2: Mesozoic and Cenozoic
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A 250 m-deep, inclined well, the Mont Terri BDB-1, was drilled through Jurassic Opalinus Clay and... more A 250 m-deep, inclined well, the Mont Terri BDB-1, was drilled through Jurassic Opalinus Clay and its bounding formations at the Mont Terri rock laboratory (NW Switzerland). A continuous section is thereby available for the first time for the Mont Terri area, from the topmost members of the Staffelegg Formation to the basal layers of the Hauptrogenstein Formation. The well core was studied extensively for lithostratigraphy and biostratigraphy (drawing upon three sections from the Mont Terri area). The macro- and micropaleontological as well as the palynostratigraphical data are complementary not only spatially but account further for almost all biozones embracing the Late Toarcian and the Early Bajocian. A suite of geophysical logs was compiled and this method permits detection of formational and intraformational boundaries in the BDB-1 well. In the framework of interdisciplinary study, analysis of the above-mentioned formations permitted straightforward processing to derive substantial new data for the Mont Terri area. Lithologic inventory, stratigraphic architecture, thickness variations and the biostratigraphic classification of the studied formations in part deviate considerably from occurrences in northern Switzerland that outcrop farther to the east. For the Passwang Formation, with the exception of the Sissach Member, no further lithostratigraphic subdivision is possible according to the members defined in the type region. Also noteworthy is that the approximately 130 mthick Opalinus Clay in drill core BDB-1 appears thinner by 20 m than that in the Mont Terri tunnel. The lowermost 38 m of the Opalinus Clay can be attributed chronostratigraphically solely to the Aalensis Zone (Late Toarcian). The accumulation of the Opalinus Clay, however, was also initiated at the same time farther east in northern Switzerland (Aalensis Subzone, Aalensis Zone), but contemporaneously in the Mont Terri area, there was a sedimentation rate two or three orders of magnitude higher.
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... 49 Page 3. 25 No Joke Movement: Mehr über den Hauensteiner Ichthyosaurier ... EMPA Dübendorf:... more ... 49 Page 3. 25 No Joke Movement: Mehr über den Hauensteiner Ichthyosaurier ... EMPA Dübendorf: A. FLISCH, A. OBRIST. Rechtsmedizin: M. BENECKE (Köln), R. BUX und F. RAMSTHALER (Frankfurt aM), H. KLOTZBACH (Ham-burg), D. WYLER (Basel). ...
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Travaux de l’Institut Scientifique, Rabat, Série Géologie et Géographie Physique, 2000
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Palaeobiodiversity and Palaeoenvironments, 2014
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Swiss Journal of Geosciences
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Swiss Journal of Geosciences
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Swiss Journal of Geosciences, 2017
A 250 m-deep inclined well, the Mont Terri BDB-1, was drilled through the Jurassic Opalinus Clay ... more A 250 m-deep inclined well, the Mont Terri BDB-1, was drilled through the Jurassic Opalinus Clay and its bounding formations at the Mont Terri rock laboratory (NW Switzerland). For the first time, a continuous section from (oldest to youngest) the topmost members of the Staffelegg Formation to the basal layers of the Hauptrogenstein Formation is now available in the Mont Terri area. We extensively studied the drillcore for lithostratigraphy and biostratigraphy, drawing upon three sections from the Mont Terri area. The macropaleontological, micropaleontological, and palynostratigraphical data are complementary, not only spatially but they also cover almost all biozones from the Late Toarcian to the Early Bajocian. We ran a suite of geophysical logs to determine formational and intraformational boundaries based on clay content in the BDB-1 well. In the framework of an interdisciplinary study, analysis of the above-mentioned formations permitted us to process and derive new and substantial data for the Mont Terri area in a straightforward way. Some parts of the lithologic inventory, stratigraphic architecture, thickness variations, and biostratigraphic classification of the studied formations deviate considerably from occurrences in northern Switzerland that crop out further to the east. For instance, with the exception of the Sissach Member, no further lithostratigraphic subdivision in members is proposed for the Passwang Formation. Also noteworthy is that the ca. 130 m-thick Opalinus Clay in the BDB-1 core is 20 m thinner than that equivalent section found in the Mont Terri tunnel. The lowermost 38 m of the Opalinus Clay can be attributed chronostratigraphically solely to the Aalensis Zone (Late Toarcian). Deposition of the Opalinus Clay began at the same time farther east in northern Switzerland (Aalensis Subzone, Aalensis Zone), but in the Mont Terri area the sedimentation rate was two or three orders of magnitude higher.
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A three-dimensional well-preserved ichthyosaur skull and parts of the postcranial skeleton are at... more A three-dimensional well-preserved ichthyosaur skull and parts of the postcranial skeleton are attributed to the species Leptonectes tenuirostris (Conybeare, 1822). It was found vertically embedded in Pliensbachian deposits representing three successive biozones (ibex to margaritatus Zone). The find is dated as early Late Pliensbachian (margaritatus Zone) by a rich ammonite and ostracod fauna. It is the first record of the
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Data Revues 00166995 00390005 0600088x, Mar 21, 2008
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