Depositional Environment of Coral–Rudist Associations inthe Upper Cretaceous Cardenas Formation (Central Mexico)
<div>In the Cardenas Formation (central Mexico), a 175 m thick sedimentary</div><div>sequence of Maastrichtian age was analyzed with respect to its palaeontology and sedimentology. A wide variety of lithological and palaeontological features characterize this sequence comprising un...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Croatian Geological Survey
2003-12-01
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| Series: | Geologia Croatica |
| Subjects: | |
| Online Access: | http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/224 |
| Summary: | <div>In the Cardenas Formation (central Mexico), a 175 m thick sedimentary</div><div>sequence of Maastrichtian age was analyzed with respect to its palaeontology and sedimentology. A wide variety of lithological and palaeontological features characterize this sequence comprising unfossiliferous and fossil-bearing sand- and siltstones, and diverse rudist and coral–rudist associations in carbonate or mixed carbonate/clastic lithologies. A total of 24 rudist and coral–rudist associations are exposed in the investigated section, which are grouped into 5 limestone units. Radiolitid assemblages, coral–rudist reefs, coral-domi-nated reefs, and hippuritid-dominated reefs are present. The stacking pattern of these reef intervals indicates a general transgressive trend through the entire section. Smaller-scale facies trends could be distinguished within each limestone unit, comprising deepening-upward sequences, defined by a shoreface–calcareous algae–radiolitid–marl facies transition, and shallowing-upward sequences defined by a hippuritid–actaeonellid–coral/rudist facies transition. This cyclic sedimentation pattern is obscured by an episodic input of clastic sediments</div><div>derived from the uplifting Sierra Madre Oriental, which in turn triggered either the development or decline of reefs.</div> |
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| ISSN: | 1330-030X 1333-4875 |