بيوستراتيغرافية رسوبات السينونيان الأسفل في السلسلة التدمرية الجنوبية

Abstract EN

The Lower Senonian sediments expose in the South Palmyridian Chain and they are represented by Rmah and Sawwanah Formations.

Rmah Formation is represented by limestones, dolomitic limestones, clayey and siliceous limestones as well as flint horizons.

While Sawwanah Formation is represented by alternation of clayey and siliceous limestones with soft, greenish and blackish marl layers, as well as some flint horizons at the lower part of the formation and by layers of organic and phosphatic limestones.

Rmah and Sawwanah Formations were subdivided into six biozones based on the detailed study of the content of the samples of foraminifera, these zones are Dicarinella primitiva, Dicarinella concavata, Dicarinella asymetrica, Globotruncana elevata, Globotruncana ventricosa Globotruncanita calcarata.

The Globotruncana elevata Zone was divided into two subzones, Planoglobulina glabrata subzone and Rosita fornicate subzone, as well as the Globotruncana ventricosa Zone was divided into two subzones, Globotruncanita elevata sturtiformis subzone of upper part of Early Campanian age and Globotruncana arca subzone of lower part of Late Campanian age.

Based on these results we have been identified the age of Sawwanah Formation, ranges from upper part of Early Campanian to the top of Late Campanian.

While, the age of Rmah Formation ranges from Coniacian to Early Campanian