کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4581061 | 1333678 | 2012 | 12 صفحه PDF | دانلود رایگان |
A combined micropalaeontological and sedimentological investigation of the Early Eocene Naredi Formation (thickness varying between 20 m and 60 m) reveals a complete third-order cycle and six fourth-order sea level cycles. Within the third-order cycle the foraminiferal abundance and diversity gradually increase upwards and reach their maximum values at about 41 m thickness above the base of the formation and subsequently decrease upward and finally give way upward to an unfossiliferous zone at the topmost part. Within a fourth-order cycle foraminiferal abundance and diversity exhibit a similar increasing and decreasing pattern. Bounded between two unconformities the Naredi Formation represents a sequence. A highly fossiliferous Assilina-bearing limestone interval represents the maximum flooding zone which separates the transgressive systems tract at the base from the highstand systems tract at the top.
Journal: Journal of Palaeogeography - Volume 1, Issue 2, October 2012, Pages 126–137