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Gastropods Associated with Fossil Traces from Yacoraite Formation(Maastrichtian-Danian),and its Paleoenvironmental Significance,Jujuy,Northwestern Argentina

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 860-867页

作者： Carlos A.CóNSOLE GONELLA Miguel GRIFFIN Florencio G.ACENOLAZA Instituto Superior de Correlacion Geologica(INSUGEO-CONICET) TucumanArgentina Division Paleozoologia de Invertebrados Facultad de Ciencias Naturales y MuseoUniversidad Nacional de la Plata(UNLP-CONICET)Buenos AiresArgentina

We present results tending to characterize the new records of invertebrates from the Yacoraite Formation （Maastrichtian-Danian）. The fossils reported come from two stratigraphic sections exposed in the surroundings of Maimara and Jueya, province of Jujuy, northwestern Argentina. The selection was based on geological and paleontological evidence. The recovered fossils include gastropods and invertebrate fossil traces, including Planolites, Skolithos and Gastrochanoelites ichnogenus. As result of our review, we discussed the possibility of assigning the analyzed gastropods to the family Zygopleuridae （gene. et. sp. indet.）, as an approximation to the taxonomic resolution of this fossil fauna. The trace fossils were assigned to the archetypical glossifungites ichnofacies. The study of the fossil assemblage allowed us to define a shallow depositional environment, characteristic of a marine context with high-energy conditions.

关键词： gastropod glossifungites Yacoraite Formation

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Significance of ichnofossils to genetic stratigraphy——Examples from the Cretaceous of Alberta, Canada

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Science China Earth Sciences 2000年第5期43卷 541-560页

作者： S.George Pemberton James A.MacEachern Murray K.Gingras 张建平 Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlbertaCanadaT6G 2E3 Earth Sciences Simon Fraser UniversityBurnabyBritish ColumbiaCanadaV5A 1S6 Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlbertaCanadaT6G 2E3 Department of GeologyChina University of GeosciencesBeijing 100083China Correspondence should be addressed to zhang Jianping

Trace fossils represent both sedimentological and paleontological entities, representing a unique blending of potential environmental indicators in the rock record. Trace fossils and trace fossil suites can be employed effectively to aid in the recognition of various discontinuity types and to assist in their genetic interpretation. Ichnology may be employed to resolve surfaces of strati-graphic significance in two main ways: 1) through the identification of discontinuities using substrate-controlled ichnofacies, and 2) through careful analysis of vertical softground (penecontem-poraneous) ichnologic successions (analogous to facies successions). Ichnological analysis is a valuable tool in genetic stratigraphic studies. Integrating the data derived from substrate-controlled ichnofacies with paleoecological data from vertical ichnologic successions greatly enhances the recognition and interpretation of a wide variety of stratigraphic surfaces. When this is coupled with conventional facies analysis and sequence stratigraphy, a powerful approach to the interpretation of the rock record is generated.

关键词： trace fossils glossifungites ichnofacies genetic stratigraphy sequence boundaries Western Canada sedimentary Basin Cretaceous.

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