Gharif Formation | |
---|---|
Stratigraphic range: Permian | |
Type | Geological formation |
Unit of | Haushi Group |
Sub-units |
|
Underlies | Khuff Formation |
Overlies | Al Khlata Formation |
Thickness | 157 m (518.1 ft) |
Location | |
Coordinates | 55°31’00”E, 19°17’45”N [1] |
Country | Oman |
The Gharif Formation is a geologic formation in Oman. It preserves fossils dating back to the Permian period. The Gharif clastic reservoirs are an important hydrocarbon production unit, and the formation is a major producing oil and gas reservoir in Oman. [1] [2] [3]
The subsurface Gharif Formation has been informally divided into 3 members (Lower, Middle and Upper) by geologists from Petroleum Development Oman. Though these members may be difficult to distinguish in certain localities due to rapid lateral facies changes, differential incision, salt movement or erosion, multiple studies have shown that these 3 members can be correlated on a regional scale. [1] [3] [4]
The lower member is about 65 m (214.5 ft) thick in north and central Oman. It has been split into 3 submembers: [1] [3] [4]
The middle member is about 85 m (280.5 ft) thick in north and Central Oman. It contains the following 3 informal units (from the base up): [1] [3]
The upper member is about 90 m (295 ft) thick in north and central Oman. Informally, it has been split into the ‘Upper Gharif Sandstone’ and ‘Upper Gharif Red Beds’. [1] [3]
Amphibians reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Aistopoda? | Indeterminate | Al Wusta Region. [5] | Middle Gharif. [5] | A vertebra. [5] | Potential aistopod fossil. | |
Lepospondyli | Indeterminate | Al Wusta Region. [5] | Middle Gharif. [5] | Tooth plate. [5] | A lepospondyl. |
Acanthodians reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Acanthodii | Indeterminate | Al Wusta Region. [5] | Middle Gharif. [5] | Scales. [5] | Undeterminable acanthodian remains. | |
Bony fish reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Gnathorhiza | G. sp. | Al Wusta Region. [5] [6] | Middle Gharif. [5] [6] | Vomer & pterygoid. [5] | A lungfish. | |
Palaeoniscoidei | Indeterminate | Al Wusta Region. [5] | Middle Gharif. [5] | Scales. [5] | Undeterminable palaeoniscoid remains. | |
Cartilaginous fish reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Lissodus | L. sp. | Al Wusta Region. [5] | Middle Gharif. [5] | A tooth. [5] | A hybodont. | |
Triodus | T. sp. | Al Wusta Region. [5] | Middle Gharif. [5] | Isolated teeth. [5] | A xenacanth. | |
Wurdigneria | W. sp. | Al Wusta Region. [5] | Middle Gharif. [5] | Isolated teeth. [5] | A xenacanth. | |
Invertebrates reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Conchostraca | Al Wusta Region. [5] | Middle Gharif. [5] | A clam shrimp. | |||
" Spirorbis " | Al Wusta Region. [5] | Middle Gharif. [5] | A spirorbiform microconchid. | |||
Plants reported from the Gharif Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Locality | Stratigraphic member | Material | Notes | Images |
Arberia | A. sp. | Huqf area. [7] | Isolated fertile structure. [7] | A glossopteridale. | ||
Arberiopsis | A. sp. | Huqf area. [7] | Isolated fertile structure. [7] | A glossopteridale. | ||
Baieroxylon | B. implexum | Huqf area. [7] [8] | Wood. [7] [8] | A ginkgoale. | ||
Calamites | C. gigas | Huqf area. [7] | Medullar casts. [7] | A horsetail. | ||
Calamostachys | C. dumasii | Huqf area. [7] | Medullar casts. [7] | A horsetail. | ||
Cathaysiopteris | C. whitei | Huqf area. [7] | Leaves. [7] | A gigantopterid. | ||
Comia | C. sp. | Huqf area. [7] | Leaves. [7] | A probable seed plant. | ||
Cyclodendron | C. leslii | Huqf area. [7] | A lepidodendrale. | |||
Dadoxylon (Eristophyton) | D. (E.) callixyloides | Huqf area. [7] [8] | Wood. [7] [8] | A conifer, represents a new species. | ||
Gigantonoclea | G. lagrelii | Huqf area. [7] | Leaves. [7] | A gigantopterid. | ||
G. sp. | Huqf area. [7] | A gigantopterid. | ||||
Gigantopteris | G. sp. | Huqf area. [7] | Leaves. [7] | A gigantopterid. | ||
Glossopteris | G. angustifolia | Huqf area. [7] | Leaves. [7] | A glossopteridale. | ||
G. browniana | Huqf area. [7] | A glossopteridale. | ||||
G. claramarginata | Huqf area. [7] | A glossopteridale. | ||||
G. damudica | Huqf area. [7] | A glossopteridale. | ||||
G. occidentalis | Huqf area. [7] | A glossopteridale. | ||||
G. taeniopteroides | Huqf area. [7] | A glossopteridale. | ||||
Lanceolatus | L. sp. | Huqf area. [7] | Female organs. [7] | A glossopteridale. | ||
Lepidodendron | L. acutangula | Huqf area. [7] | Stems. [7] | A lepidodendrale. | ||
Lidgettonia | L. sp. | Huqf area. [7] | A glossopteridale. | |||
Otovicia (Walchia) | O. (W.) hypnoides | Huqf area. [7] | A conifer. | |||
Plumsteadia | P. sp. | Huqf area. [7] | Female organs. [7] | A glossopteridale. | ||
Prototaxoxylon | P. gharifense | Huqf area. [7] [8] | Wood. [7] [8] | |||
Sigillaria | S. brardii | Huqf area. [7] | A lepidodendrale. | |||
Sphenophyllum | S. speciosum | Huqf area. [7] | Macrofossils. [7] | A sphenophyllale. | ||
S. sino-coreanum | Huqf area. [7] | Macrofossils. [7] | A sphenophyllale. | |||
Tingia | T. sp. | Huqf area. [7] | Leaves. [7] | A noeggerathiale. | ||
Tingiostachya | T. sp. | Huqf area. [7] | Fertile cones. [7] | A noeggerathiale. | ||
Trigonomyelon | T. omanense | Huqf area. [7] [8] | Wood. [7] [8] | A probable conifer. | ||
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