کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4745243 | 1359694 | 2015 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Description et biozonation des sections de crinoïdes saccocomidés du Jurassique supérieur (Oxfordien-Tithonien) du domaine téthysien occidental
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فسیل شناسی
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![عکس صفحه اول مقاله: Description et biozonation des sections de crinoïdes saccocomidés du Jurassique supérieur (Oxfordien-Tithonien) du domaine téthysien occidental Description et biozonation des sections de crinoïdes saccocomidés du Jurassique supérieur (Oxfordien-Tithonien) du domaine téthysien occidental](/preview/png/4745243.png)
چکیده انگلیسی
The study of several hundreds of thin sections, from dozens of outcrops in three different palaeogeographic domains: the External Rif Chain (Morocco), the Vocontian Basin (Southeastern France) and the Northern Tunisia, has helped better to characterize the stratigraphic distribution of the pelagic crinoids, roveacrinid saccocomids. The saccocomids, appearing in the Middle Oxfordian, are thriving noticeably in the three studied basins at the base of the Early Tithonian substage (Hybonotum ammonite zone) and dominate the pelagic microfauna up to the relative disappearance of the group at the top of the Late Tithonian, at the limit of the A2Â and A3Â subzones of calpionellids. Careful examination of the respective skeletal elements of this fossil group in thin sections lead to define 47Â types of skeletal sections, divided into 6Â different groups. These skeletal sections are described and named on the base of their geometric forms. Most of these sections have typical geometric shapes and occur in coeval stratigraphic levels in the three investigated basins. Several of these sections are characteristic of a specific stratigraphic interval, either by their geometric shape or by their relative frequency. The stratigraphic distribution of the investigated skeletal sections, previously considered as of limited stratigraphical value, allowed to define 7Â association and relative frequency biozones for the Late Oxfordian-Late Tithonian interval. These biozones are correlated with the ammonite zones.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annales de Paléontologie - Volume 101, Issue 2, AprilâJune 2015, Pages 95-117
Journal: Annales de Paléontologie - Volume 101, Issue 2, AprilâJune 2015, Pages 95-117
نویسندگان
Mohamed Benzaggagh, Catherine Homberg, Johann Schnyder, Sonia Ben Abdesselam-Mahdaoui,