Stratigraphy and macrofauna of the Lower Jurassic (Toarcian) Marrat Formation, central Saudi Arabia

Journal Article
Al-Kahtany, Abdelbaset S. El-Sorogy, Mohamed Gameil, Mohamed Youssef, Khaled M. . 2017
Publication Work Type: 
article
Magazine \ Newspaper: 
Journal of African Earth Sciences.
Volume Number: 
134
Pages: 
476-492
Publication Abstract: 

The stratigraphy and macrofaunal content of the Lower Jurassic (Toarcian) Marrat Formation was studied
at Khashm adh Dhibi, central Saudi Arabia. The studied succession is dominated by limestones and
dolomites, with subordinate occurrences of sandstones, siltstones and claystones. The formation is highly
fossiliferous with brachiopods, gastropods, bivalves, ammonites and echinoids, particularly the lower
and upper members. Twenty nine species are identified, they include 7 species of brachiopods, 8 gastropods,
8 bivalves, 4 ammonites and 2 echinoids. Many of the identified fauna are correlated with Jurassic equivalents in Jordan, Italy, Morocco, Egypt and India. Three gastropod species: Globularia subumbilicata, Ampullospira sp., Purpuroidea peristriata and seven bivalve species: Palaeonucula lateralis, Chlamys (Radulopecten) fibrosa, Eligmus weiri, E.integer, E. asiaticus, Musculus somaliensis and Pholadomya orientalis were recognized for the first time in the Lower Jurassic deposits of Saudi Arabia.