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L'évolution des peuplements d'ammonites au cours de l'Oxfordien inférieur (Zone à Mariae et Zone à Cordatum) du Jura (Est de la France)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Jardat, Rémi |
| Copyright Year | 2010 |
| Abstract | The study of more than 40 sections in the "Creniceras renggeri marls" of the French Jura Range (Lower Oxfordian) has found: • a precise biochronostratigraphic subdivison of 16 successive populations or associations which appears to be stable over the whole geographic area concerned; • the correlation of these populations with the Lower Oxfordian zones of the GFEJ (French Research Jurassic Group) and with those of southern England (Weymouth) and Poland (Cracow area); • an autecologic and synecologic analysis of Oxfordian ammonite associations in the Jura Moun-tains; • an interpretation of these faunas in terms of palaeo-depth and sequence stratigraphy units. The main results of the study are the following: • identification of the Costicardia Subzone; • validation of the subdivision of the Mariae Zone established by FORTWENGLER and MARCHAND (1994), with a woodhamense horizon above a scarburgense horizon; • division of the woodhamense horizon into two units: the lower one is the woodhamense s.s. unit and the upper one includes abundant specimens of woodhamense var. normandiana SPATH; • correlation of tectonic units on either side of the Salins fault and of some characteristics of the ammonite populations; • identification of five steps of changes in depth in the Jura area which may be interpreted as sequence stratigraphic units: a first episode of deepening during the period bounded by the scarburgense and praemartini horizons, an episode of stability bounded by the beginning and the end of the alphacordatum horizon, a slight regressive trend that lasted throughout the duration of the praecordatum horizon, a second episode of stability that persisted from the Bukowskii Subzone to the Costicardia Subzone, and a third deepening trend during the existence of the Cordatum Subzone. |
| File Format | PDF HTM / HTML |
| DOI | 10.4267/2042/35492 |
| Alternate Webpage(s) | http://documents.irevues.inist.fr/bitstream/handle/2042/35492/CG2010_A07.pdf;jsessionid=40BC877DA60415104757A92A4F02D951?sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.4267/2042%2F35492 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
