Walliser, Otto Heinrich

[["dc.bibliographiccitation.firstpage","225"],["dc.bibliographiccitation.lastpage","250"],["dc.contributor.author","Walliser, Otto H."],["dc.date.accessioned","2019-07-19T10:09:50Z"],["dc.date.available","2019-07-19T10:09:50Z"],["dc.date.issued","1996"],["dc.identifier.doi","10.1007/978-3-642-79634-0_11"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61775"],["dc.language.iso","en"],["dc.publisher","Springer"],["dc.relation.isbn","978-3-642-79636-4"],["dc.relation.isbn","978-3-642-79634-0"],["dc.relation.ispartof","Global Events and Event Stratigraphy in the Phanerozoic Results of the International Interdisciplinary Cooperation in the IGCP-Project 216 “Global Biological Events in Earth History”"],["dc.title","Global Events in the Devonian and Carboniferous"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","281"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Facies"],["dc.bibliographiccitation.lastpage","296"],["dc.bibliographiccitation.volume","40"],["dc.contributor.author","Peckmann, Jörn"],["dc.contributor.author","Walliser, Otto Heinrich"],["dc.contributor.author","Riegel, Walter"],["dc.contributor.author","Reitner, Joachim"],["dc.date.accessioned","2019-07-19T10:12:22Z"],["dc.date.available","2019-07-19T10:12:22Z"],["dc.date.issued","1999"],["dc.description.abstract","The Middle Devonian Hollard Mud Mound is situated in the eastern Hamar Laghdad, which is a small mountain range in the Tafilalt in SE Morocco. In contrast to the well known Lower Devonian Kess-Kess mounds, the Hollard Mound is of Middle Devonian age. The facies in the core of this mud mound differs from that of the other parts of the mound, and exhibits signatures of ancient hydrocarbon venting. The carbonate phases of the core facies are derived from the oxidation of vent fluids and consist of clotted micrite, a cryptocrystalline carbonate associated with spheres of uncertain origin, and a calcitic rim cement (rim cement B). These vent carbonates show δ13C values in the range of −11 to −20% PDB indicating that some of their carbon is derived from isotopically light hydrocarbons. Fossiliferous micrite has been affected by hydrocarbon venting in the proximity of the vent site, which is indicated by intermediate δ13C values between vent carbonates and not affected sediments. Bivalves occur in dense populations within the core facies. They form autochthonous shell accumulations and are almost exclusively articulated. it is likely that these bivalves were dependent on chemosynthesis similar to their counterparts at modern vents. The vent deposits also exhibit an unusual prasinophyte assemblage, which might have been linked to the specific nutrient availability at the vent site. The ancient vent site is characterized by an enhanced carbonate precipitation and rapid lithification. The latter is corroborated by the three-dimensional preservation of phytoplankton (prasinophytes and acritarchs) and the occurrence of stromatactoid pores. An early phase of carbonate corrosion predating the formation of vent carbonates affected the fossiliferous micrite of the core facies and is thought to be related to a phase of H2S-rich venting."],["dc.identifier.doi","10.1007/BF02537477"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61776"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0172-9179"],["dc.relation.issn","1612-4820"],["dc.title","Signatures of hydrocarbon venting in a Middle Devonian Carbonate Mound (Hollard Mound) at the Hamar Laghdad (Antiatlas, Morocco)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","114"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Palaios"],["dc.bibliographiccitation.lastpage","122"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Peckmann, Joern"],["dc.contributor.author","Campbell, Kathleen A."],["dc.contributor.author","Walliser, Otto H."],["dc.contributor.author","Reitner, Joachim"],["dc.date.accessioned","2018-07-05T07:47:39Z"],["dc.date.available","2018-07-05T07:47:39Z"],["dc.date.issued","2007"],["dc.description.abstract","A spectacular carbonate deposit from the western Meseta of Morocco consists of microbial and brachiopod limestones. The small, metersized Famennian limestone blocks are embedded in Carboniferous shales, implying later displacement. Primary deposition of the limestones apparently occurred below the depth limit of phototrophic organisms. The brachiopods belong to the genus Dzieduszyckia within the rhynchonellide superfamily Dimerelloidea. They occur in fantastic abundance, in a low-diversity faunal assemblage. The microbial limestones contain fossilized threadlike microorganisms of unknown affiliation. The enormous accumulation of brachiopods on the Famennian seafloor is best explained by the former existence of a seep. Crude oil was a major component of the seepage fluids, as indicated by the occurrence of pyrobitumen (metamorphosed petroleum) and delta C-13(carbonate) values as low as -12 parts per thousand, akin to the isotopic composition of carbonates forming at modern oil seeps. The lowest delta C-13 values in the Dzieduszyckia deposit are found for a carbonate phase referred to as banded/botryoidal cement. It is a fibrous, low-Mg calcite cement in the form of isopachous rims and botryoids that precipitated directly on and within brachiopod shells. The microbial limestones predominantly consist of this phase and therefore can be classified as cement framestones. Reticulate patterns of botryoidal aggregates and an elevated Sr content agree with an aragonite precursor of the banded/botryoidal cement. The interpretation of the Dzieduszyckia deposit as seep related supports the hypothesis that Paleozoic and Mesozoic members of the rhynchonellide superfamily Dimerelloidea were a lineage long associated with seeps that survived from Late Devonian to Early Cretaceous time."],["dc.identifier.doi","10.2110/palo.2005.p05-115r"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15166"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.eissn","0883-1351"],["dc.title","A Late Devonian Hydrocarbon-Seep Deposit Dominated By Dimerelloid Brachiopods, Morocco"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","115"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Newsletters on Stratigraphy"],["dc.bibliographiccitation.lastpage","147"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Carls, Peter"],["dc.contributor.author","Gandl, Josef"],["dc.contributor.author","Groos-Uffenorde, Helga"],["dc.contributor.author","Jahnke, Hans"],["dc.contributor.author","Walliser, Otto H."],["dc.date.accessioned","2019-07-19T09:54:39Z"],["dc.date.available","2019-07-19T09:54:39Z"],["dc.date.issued","1972"],["dc.description.abstract","Die Untersuchung der Vergesellschaftung rheinischer und hercyischer Faunen in Aragón ergab: (1) Die Grenze Zlichov-Kalk / Daleje-Schiefer (= Grenze Nowakia barrandei/ N. cancellata), bisher allgemein der Grenze Ems- / Eifel-Stufe gleichgesetzt, liegt wesentlich tiefer. Sie entspricht etwa der Grenze Unter- /Ober-Ems-Stufe. Die Zlichov-Stufe gehört also ganz in die Unter-Ems-Stufe. (2) Die N. barrandei-/N. cancellata-Grenze liegt innerhalb der Zone des Spathognathodus steinhornensis und nahe dem Übergang von Polygnathus linguiformis foveolatus zu P. linguiformis linguiformis. (3) Gyroceratites laevis kommt zusammen mit Sp. steinhornensis und N. cancellata vor. Die Grenze Gyroceratites laevis/ G. gracilis liegt innerhalb der Zone der N. cancellata. (4) Der Choteč-Kalk wird dem Günteröder Kalk plus Zwischenschichten am E-Rand des Rheinischen Schiefergebirges etwa gleichgestellt. Seine Basis lieg wesentlich tiefer als bisher allgemein angenommen."],["dc.description.abstract","Rhenish and hercynic faunas associating and alternating in the Devonian of Aragón reveal new correlations: (1) The boundary Zlichov Limestones/Daleje Shales in Bohemia (= boundary Nowakia barrandei / N. cancellata), commonly identified with the Emsian /Eifelian stage boundary, is much older: cose to the Lower/Upper Emsian boundary. The entire Zlichovian is part of the late Lower Emsian. (2) The boundary N. barrandei /N. cancellata lies within the zone of Spathognathodus steinhornensis and close to the transition of Polygnathus linguiformis foveolatus to P. l. linguiformis. (3) Gyroceratites laevis occurs together with Sp. steinhornensis and N. cancellata. The boundary G. laevis/G. gracilis is within the zone of N. cancellata. (4) The Choteč Limestone of Bohemia is correlated closely with Günterod Limestone plus Zwischenschichten in Germany. Its base is considerably older than previously supposed."],["dc.description.abstract","Faunas rhenanas y hercínicas se asocian e intercambian en el Devónico de Aragón y facilitan nuevas correlaciones: (1) El límite Calizas de Zlichov / Pizarras de Daleje en Bohemia (= límite Nowakia barrandei / N. cancellata) que se identificaba con el límite de los pisos Emsiense y Eifeliense, corresponde aproximadamente al límite Emsiense Inferior /Superior. Todo el Zlichoviense pertenece al Emsiense Inferior. (2) El limite N. barrandei / N. cancellata está dentro de la biozona de Spathognathodus steinhornensis y próximo a la transición de Polygnathus linguiformis foveolatus a P. l. linguiformis. (3) Gyroceratites laevis se asocia a Sp. steinhornensis y N. cancellata. El límite G. laevis /G. gracilis está dentro de la biozona de N. cancellata. (4) La Caliza de Choteč en Bohemia, que se databa como Eifeliense superior, se relaciona con la serie de Caliza de Günterod y Zwischenschichten en Alemania. Su base es bastante inferior a lo supuesto hasta ahora."],["dc.identifier.doi","10.1127/nos/2/1972/115"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61772"],["dc.language.iso","de"],["dc.relation.issn","0078-0421"],["dc.title","Neue Daten zur Grenze Unter-/ Mittel-Devon"],["dc.title.alternative","New data about the Lower-/Middle Devonian boundary"],["dc.title.subtitle","Neue Daten zur Grenze Unter-/ Mittel-Devon"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","65"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","GFF"],["dc.bibliographiccitation.lastpage","69"],["dc.bibliographiccitation.volume","136"],["dc.contributor.author","Corriga, Maria Giovanna"],["dc.contributor.author","Corradini, Carlo"],["dc.contributor.author","Haude, Reimund"],["dc.contributor.author","Walliser, Otto Heinrich"],["dc.date.accessioned","2019-07-19T10:16:33Z"],["dc.date.available","2019-07-19T10:16:33Z"],["dc.date.issued","2014"],["dc.description.abstract","Three sections (Atrous 3, Atrous 7 and Bou Tchrafine N2) in the “Scyphocrinites Limestones” of Tafilalt (southeastern Morocco) have been investigated for conodont and crinoid stratigraphy. Conodonts allow to discriminate four biozones (Ozarkodina eosteinhornensis s.l., Lower Oulodus elegans detortus, Upper O. elegansdetortus, and Icriodus hesperius) of Pridoli and the lowermost Lochkovian. Cirrus loboliths occur only in the Pridoli, whereas plate loboliths are present in the uppermost Silurian and the basal Devonian; the two types overlap in the uppermost Silurian. As for calices, Scyphocrinites and Carolicrinus occur in the whole Pridoli; Camarocrinus and Marhoumacrinus are present across the Silurian–Devonian boundary and in basal Devonian beds."],["dc.identifier.doi","10.1080/11035897.2013.862849"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61777"],["dc.language.iso","en"],["dc.relation.issn","1103-5897"],["dc.relation.issn","2000-0863"],["dc.title","Conodont and crinoid stratigraphy of the upper Silurian and Lower Devonian scyphocrinoid beds of Tafilalt, southeastern Morocco"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]