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Dhruma - D7 Hisyan, Riyadh Region, Saudi Arabia
| Formation | Dhruma |
|---|---|
| Member | D7 Hisyan |
| Age: | 165 - 161 Ma Jurassic |
| Interval | Middle Callovian |
| Lithology | claystone, claystone/"limestone", "limestone", "limestone"/claystone, claystone/marl, sandstone/claystone |
| Number of Collections | 18 |
| Number of Occurrences | 47 |
Recorded Sample Locations
| Location | Region | Stratigraphic Name |
|---|---|---|
| Khashm at Turab | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Bed No. 3 | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Bed No. 338 | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Shaqra Group | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Shaqra Group | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Shaqra Group | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Bed No. 207 | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
| Shaqra Group | Riyadh Region, Saudi Arabia | Dhruma - D7 Hisyan |
Associated Units
| Stratigraphic Name | Age | Lithology | Occurrence Records |
|---|---|---|---|
| Dhruma - D1 | 172 - 168 Ma Middle Jurassic | claystone/"limestone", claystone | 4 |
| Dhruma - D2 | 172 - 168 Ma Middle Jurassic | claystone, "limestone" | 8 |
| Dhruma - D3 | 168 - 165 Ma Middle Jurassic | claystone, "limestone", "limestone"/marl | 32 |
| Dhruma - D4 | 168 - 165 Ma Middle Jurassic | limestone | 14 |
| Dhruma - D5 | 168 - 165 Ma Middle Jurassic | limestone/claystone, dolomite, "limestone", claystone/"limestone" | 19 |
| Dhruma - D6 | 168 - 165 Ma Middle Jurassic | limestone | 3 |
| Dhruma - D7 Atash | 165 - 161 Ma Jurassic | limestone | 16 |
| Dhruma - Hisyan | 166 - 164 Ma Middle Jurassic | limestone/"shale", "limestone" | 12 |
| Dhruma - Upper | 165 - 161 Ma Jurassic | limestone, claystone, "limestone"/dolomite | 50 |
| Marrat - Middle | 183 - 182 Ma Early Jurassic | limestone | 5 |
| Tuwaiq Mountain - T1 | 165 - 161 Ma Jurassic | claystone/"limestone", "limestone" | 14 |
| Tuwaiq Mountain - T2 | 165 - 161 Ma Jurassic | limestone | 27 |
| Tuwaiq Mountain - T3 | 165 - 161 Ma Jurassic | limestone, dolomite | 17 |
| Shaqra - Dhruma | 168 - 165 Ma Middle Jurassic | limestone | 1203 |
| Shaqra - Tuwaiq Mt.Lst. | 166 - 164 Ma Middle Jurassic | limestone, framestone | 532 |
Recorded Fossils
References
| Alméras Y., Cougnon M., et al (2010) Brachiopodes du Jurasique Inférieur et moyen d'Arabie Saoudite centrale, Documents des Laboratoires de Géologie de Lyon 168, 1-247 |
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
