High-resolution calcareous nannofossil biostratigraphy of the Santonian/Campanian Stage boundary,Western Interior Basin,USA |
| |
| Institution: | 1. Department of Earth and Atmospheric Sciences, University of Nebraska, Lincoln, NE 68588, USA;2. Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, East Beijing Road 39, 210008, Nanjing City, Jiangsu Province, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;3. University of Carthage, Faculty of Sciences of Bizerte, 7021, Jarzouna, Tunisia;4. University of Tunis El Manar, Faculty of Sciences of Tunis, UR11ES15, 2092, Tunis, Tunisia;5. University of Gabes, Faculty of Sciences of Gabes, 6072, Gabes, Tunisia;6. Geological Survey, National Office of Mines, 1080, Tunis, Tunisia;1. ING PAN – Instytut Nauk Geologicznych, Polska Akademia Nauk, O?rodek Badawczy w Krakowie, BioGeoLab, ul. Senacka 1, 31-002 Kraków, Poland;2. Departamento de Ciencias de la Tierra (Paleontología) e Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain;3. Evolution Applied Limited, 59 Higher Lux Street, Liskeard, Cornwall, PL14 3JY, UK;1. Departament de Geologia (Estratigrafia), Facultat de Ciències, Universitat Autònoma de Barcelona, Carrer de l''Eix central, E-08193 Cerdanyola del Vallès, Barcelona, Catalonia, Spain;2. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, I-00143 Rome, Italy;3. Grupo Aragosaurus–IUCA, Paleontología, Facultad de Ciencias Universidad de Zaragoza, E-50009 Zaragoza, Spain;4. Musée des Dinosaures, 11260 Espéraza, France;5. Institut Català de Paleontologia Miquel Crusafont, Carrer Escola Industrial, 23, E-08201, Sabadell, Barcelona, Catalonia, Spain;1. Institut für Geowissenschaften, Universität Heidelberg, Im Neuenheimer Feld 234, 69120, Heidelberg, Germany;2. Departamento de Biologia, Universidade Federal de Sergipe, Avenida Marechal Rondon, Rosa Elze, São Cristovão-SE, Brazil;3. Área de Ciências Exatas e Tecnologias, Universidade Tiradentes, Avenida Murilo Dantas, Farolândia, 300, Aracaju-SE, Brazil;1. Arabako Natur Zientzien Museoa/Museo de Ciencias Naturales de Álava, Siervas de Jesús 24, E–01001 Vitoria–Gasteiz, Spain;2. Instituto Geológico y Minero de España, Unidad de Zaragoza, C/Manuel Lasala 44, 50006 Zaragoza, Spain;3. Universidad del País Vasco/Euskal Herriko Unibertsitatea, Facultad de Ciencia y Tecnología, Departamento de Estratigrafía y Paleontología, Apartado 644, 48080 Bilbao, Spain;4. Geodinámica Interna, Departamento de Ciencias de la Tierra, Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain;5. Universidad de Burgos, Facultad de Ciencias, Departamento de Física, Plaza Misael Bañuelos s/n, 09001 Burgos, Spain |
| |
| Abstract: | The base of the Campanian Stage does not have a ratified Global Stratotype Section and Point (GSSP); however, several potential boundary markers have been proposed including the base of the Scaphites leei III ammonite Zone and the base of the paleomagnetic Chron C33r. Calcareous nannofossil assemblages from the Smoky Hill Member of the Niobrara Formation in the central Western Interior Seaway, USA were analyzed from two localities to determine relevant biohorizons and their relationships to these potential boundary markers. In a previous study, the Aristocrat Angus 12-8 core (Colorado) was astrochronologically dated and constrained using macrofossil zonations and radiometric ages. The Smoky Hill Member type area (Kansas) provides an expanded interval with good to excellent nannofossil preservation.Five biohorizons are useful for recognition of the Santonian/Campanian transition within the Smoky Hill Member type area, and three are useful in the Aristocrat Angus 12-8 core. The first occurrences (FOs) of Aspidolithus parcus parcus and Aspidolithus parcus constrictus, as well as the last occurrences (LOs) of Zeugrhabdotus moulladei, Helicolithus trabeculatus specimens larger than 7 μm, and Zeugrhabdotus biperforatus are in close stratigraphic proximity to the base of the Scaphites leei III Zone and the base of Chron C33r. |
| |
| Keywords: | Calcareous nannofossils Biostratigraphy Niobrara Formation Santonian/Campanian Stage boundary Western Interior Basin |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
