Table 1: Age assignments for Usfan Formation by previous authors and the present work.
Author |
Age |
Tools used |
Karpoff [1] |
Late Maastrichtian - Eocene |
Molluscs and shark teeth |
Al-Shanti [4] |
early Eocene |
Mollusca |
Brown [10] |
43-55 Ma (Eocene) |
K-Ar dating |
Basahel, et al. [11] |
Maastrichtian |
Nautiloids and bivalves |
Moore and Al-Rehaili [12] |
Paleocene to Early Eocene |
Stratigraphic position |
Abou Auf and Gheith [13] |
Maastrichtian to Eocene |
Radiometric and Biostratigraphic evidence |
Present work |
Cenomanian-Turonian |
Molluscs |