Dhruma or Darma (Arabic: ضرما) is a small town located 73.4 kilometres (45.6 mi) by road northwest of Riyadh, Saudi Arabia. [1] It is the center of the small Dhurma Governorate of …

The Dhruma Formation in Saudi Arabia is divided into three formal members (Lower, Middle, and Upper) and seven discrete informal units (units D1–D7; Vaslet et al. 1983, 1985a, b; Manivit et …

The Dhruma Formation was studied at its type locality (Khashm adh Dhibi) in well-exposed sections that serve as examples of the complete Middle Jurassic stratigraphy at its maximum …

2017年5月28日 · The Dhruma Formation shows a substantial and regular thickening to the northwest. Together with the underlying Mafraq Formation and the lower part of the Tuwaiq …

2014年4月1日 · Organic geochemical (Rock Eval, TOC) and organic petrographic analyses of the sample have confirmed the occurrence of low maturity coal in the Dhruma Formation in the Az …

2019年1月1日 · The objective of this study is to document the sedimentology and dynamic stratigraphy of the Dhruma siliciclastic in northern central Arabia, modifying the existing Middle …

The age of the Dhruma<br>Formation is based primarily on ammonites and nautiloids but supplemented by micropalaeontological<br>and palynological evidence. Carbon and oxygen …

1997年10月1日 · Hughes Clark (1988) describes the Dhruma in Oman (714 ft) as a complete cycle of sedimentation. The lower and middle limestone are mud-supported while the upper …

2024年2月16日 · Carbonate outcrops of the Jurassic Middle Dhruma Formation (D5 and D6 units), located southwest of Riyadh, Saudi Arabia, were investigated to characterize controls …

The Dhruma lies unconformably on the Early Jurassic (Middle to Late Toarcian) Marrat Formation and is unconformably overlain by the Middle Jurassic (Middle to Late Callovian) Tuwaiq …