Shaqra Group (Dhruma Fm.): Bajocian, Saudi Arabia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Nautiloculinidae
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Nautiloculina oolithica
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Rhynchonellata
- Terebratulida
- Lissajousithyrididae
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Monsardithyris ventricosa
(Hartmann 1830)
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Rhynchonellata
- Terebratulida
- Lobothyrididae
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Tubithyris chouberti
Rousselle 1965
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus bipartitus
Sowerby 1818
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Inoperna cf. sowerbyana
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Bivalvia
- Ostreida
- Eligmidae
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Eligmus polytypus
Eudes-Deslongchamps 1856
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Bivalvia
- Ostreida
- Palaeolophidae
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Lopha solitaria
(Sowerby 1824)
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synonym of Actinostreon gregareum | ||||||||||
Bivalvia
- Pectinida
- Limidae
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Plagiostoma cf. laeviusculum
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Lima gigantea
Boehm 1911
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recombined as Plagiostoma gigantea | ||||||||||
Plagiostoma gigantea
Sowerby 1814
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corrected as Plagiostoma giganteum | ||||||||||
Bivalvia
- Pectinida
- Oxytomidae
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Oxytoma cf. inaequivalis
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original and current combination Avicula (Oxytoma) | ||||||||||
Bivalvia
- Pectinida
- Pectinidae
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Chlamys nattheimensis
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Chlamys cf. textorius
(Schlotheim 1820)
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recombined as Chlamys textoria | ||||||||||
Spondylopecten cf. subspinosus
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Bivalvia
- Pectinida
- Entoliidae
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Entolium cf. corneolum
(Young and Bird 1828)
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recombined as Entolium (Entolium) corneolum | ||||||||||
Bivalvia
- Pholadomyida
- Pholadomyidae
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Pholadomya somaliensis
Cox 1935
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recombined as Pholadomya (Bucardiomya) somaliensis | ||||||||||
Homomya cf. gibbosa
Sowerby 1814
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Bivalvia
- Megalodontida
- Dicerocardiidae
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Pseudisocardia cf. macfadyeni
Cox 1935
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Bivalvia
- Pholadida
- Ceratomyidae
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Ceratomya cf. concentrica
Sowerby 1822
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Bivalvia
- Lucinida
- Lucinidae
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Fimbria cf. lajoyei
d'Archiac 1843
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia ex gr. pullus
Sowerby 1826
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Gastropoda
- Pleurotomariidae
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Orbonella sp.
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=Gastr. | ||||||||||
= Obornella sp.
Cox 1959
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Kiessling 2003 | |||||||||
Cephalopoda
- Ammonitida
- Stephanoceratidae
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Ermoceras magnificum
Arkell 1952
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Ermoceras runcinatum
Arkell 1952
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Ermoceras elegans
Douvillé 1916
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recombined as Ermoceras (Kosmermoceras) elegans | ||||||||||
Ermoceras coronatoides
(Douvillé 1916)
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Ermoceras splendens
Arkell 1952
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Ermoceras sp.
Douvillé 1916
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=n.sp.3 | ||||||||||
Ermoceras deserti
Douvillé 1916
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Crinoidea
- Millericrinida
- Apiocrinitidae
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Apiocrinites sp.
Miller 1821
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Echinoidea
- Holectypoida
- Holectypidae
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Holectypus phelani
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=phelani sp. | ||||||||||
see common names |
Geography
Country: | Saudi Arabia |
Coordinates: | 22.6° North, 46.0° East (view map) |
Paleocoordinates: | 3.2° South, 32.9° East |
Basis of coordinate: | stated in text |
Geographic resolution: | outcrop |
Time
Period: | Jurassic | Epoch: | Middle Jurassic |
Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
Key time interval: | Bajocian | ||
Age range of interval: | 170.30000 - 168.30000 m.y. ago |
Stratigraphy
Geological group: | Shaqra | Formation: | Dhruma |
Local section: | Coupe de Khashm Ushayrah (As Sitarah) | Local bed: | D2,2 |
Local order: | bottom to top |
Lithology and environment
Primary lithology: | lithified "limestone" | ||
Includes fossils? | Y | ||
Environment: | lagoonal/restricted shallow subtidal | Tectonic setting: | cratonic basin |
Geology comments: The Dhruma Fm essentially is composed of limestones and clayey rocks in its central outcrop zone but passes to detrial facies northwards and southwards. |
Taphonomy
Size of fossils: | macrofossils,microfossils |
Collection methods and comments
Collection methods: | bulk,mechanical,field collection |
Reason for describing collection: | biostratigraphic analysis |
Metadata
Database number: | 48105 | ||
Authorizer: | F. Fursich, W. Kiessling | Enterer: | S. Hicks, W. Kiessling |
Modifier: | S. Hicks | Research group: | marine invertebrate |
Created: | 2005-03-14 02:05:59 | Last modified: | 2005-03-14 04:32:58 |
Access level: | the public | Released: | 2005-03-14 02:05:59 |
Creative Commons license: | CC BY |