Document Details

Document Type : Thesis 
Document Title :
STRATIGRAPHIC AND PALEONTOLOGIC STUDIES ON THE SEDIMENTARY SUCCESSION OF USFAN-HADDAT ASHAM AREAS, WEST CENTRAL ARABIAN SHIELD, SAUDI ARABIA
دراسات طباقيه وأحفوريه على التتابع الرسوبي لمنطقة عسفان وهداة الشام بغرب وسط الدرع العربي، المملكة العربية السعودية
 
Subject : Faculty of Earth Sciences 
Document Language : Arabic 
Abstract : The sedimentary succession of the west central part of Saudi Arabia nonconformable overlying the weathered Precambrian Arabian Shield rocks. This succession is composed entirely fom clastic rocks with less abundant carbonates and ironstone. It has uncertain age where it is assigned to be Cretaceous - Eocene ages or Oligo-Miocene age according to the ages of the overlying Tertiary basic volcanics (harrat). The present study aims to study the age of this succession according to detailed paleontogical investigations of the collected fossils of the succession. This study focuses on the preserved macrofossils within the carbonates of the middle part of the succession in order to identify their age and determine their stratigraphic significance. The study is based on detailed field works including the measurement of stratigraphic sections within the sedimentary succession in the Haddat Asham and Usafan areas. This is also accompanied with the collection of macrofossiles from carbonate rocks. The collected fossils are correlated with those described in nearby areas. The study revealed the followings points: 1- There is a great similarity in the lithologic aspects of the carbonate unit in both Haddat Asham and Usfan areas where the succession in the two areas are composed of lower egg yellow dolostone unit, middle fossiliferous limestone unit and an upper egg yellow dolostone unit. 2- The collected species are similar in both areas, but they are more abundant in Usfan area than the Haddat Asham area. The lithologic and paleontologic criteria confirm the deposition of the Usfan strata in proper under marine conditions than that dominated in the lagoonal environmmnet of Haddat Asham area. The presence of glauconite and phosphate beds in Usfan area confirms the obtained results. 3- 30 molluscan species were identified from both areas, twenty-five bivalves, four gastropods and one nautiloid species. 
Supervisor : Dr. Mohammad Sayed 
Thesis Type : Master Thesis 
Publishing Year : 1441 AH
2020 AD 
Added Date : Sunday, June 14, 2020 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
ريان فريد ثقهThiqa, Rayan FaridResearcherMaster 

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