Shaqra Group (Dhruma Fm.) (Jurassic of Saudi Arabia)

Where: Saudi Arabia (25.4° N, 45.5° E: paleocoordinates 0.5° S, 33.7° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Hisyan Mb. Member (Dhruma Formation), Callovian (166.1 - 163.5 Ma)

Environment/lithology: lagoonal or restricted shallow subtidal; lithified, argillaceous limestone

• The Dhruma Fm. essentially is composed of limestones and clayey rocks in its central outcrop zone but passes to detrial facies northwards and southwards.

Size classes: macrofossils, microfossils

Collection methods: bulk, mechanical,

Primary reference: J. Manivit, Y.-M. Le Nindre, and D. Vaslet. 1990. Le Jurassique D`Arabie Centrale. Document du BRGM 4(194):25-519 [F. Fursich/S. Hicks/W. Kiessling]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 48589: authorized by Franz Fursich, entered by Simone Hicks on 24.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Foraminifera
 Lituolacea - Nautiloculinidae
Nautiloculina sp. Mohler 1938
Bivalvia
 Pectinida - Limidae
"Plagiostoma rigidum" = Lima (Plagiostoma) rigida Sowerby 1815 file clam
Plagiostoma cf. subcardiiformis Greppin 1867 file clam
 Pectinida - Entoliidae
"Entolium cf. corneolum" = Entolium (Entolium) corneolum
"Entolium cf. corneolum" = Entolium (Entolium) corneolum Young and Bird 1828 scallop
 Pectinida - Pectinoidae
Chlamys cf. curvivarians Dietrich 1933 scallop
"Chlamys cf. textorius" = Chlamys textoria Schlotheim 1820 scallop
Chlamys splendens Dollfus 1863 scallop
Camptonectes laminatus Sowerby 1818 scallop
 Ostreida - Pinnidae
 Ostreida - Palaeolophidae
"Lopha gregarea" = Actinostreon gregareum, "Lopha solitaria" = Actinostreon gregareum, "Lopha cf. marshii" = Actinostreon marshi
"Lopha gregarea" = Actinostreon gregareum Sowerby 1816 oyster
"Lopha solitaria" = Actinostreon gregareum Sowerby 1816 oyster
"Lopha cf. marshii" = Actinostreon marshi Sowerby 1814 oyster
 Ostreida - Gryphaeidae
"Nanogyra nana" = Nanogyra (Nanogyra) nana Sowerby 1822 oyster
"Nanogyra cf. striata" = Nanogyra (Palaeogyra) virgula Deshayes 1831 oyster
Bilobissa sublobata Deshayes 1830 oyster
Gryphaea bilobata Sowerby 1835 oyster
Gryphaea costellata Douvillé 1916 oyster
 Ostreida - Eligmidae
 Mytilida - Mytilidae
Modiolus bipartitus Sowerby 1818 mussel
"Modiolus imbricatus" = Modiolus (Modiolus) imbricatus Sowerby 1818 mussel
 Lucinida - Lucinidae
Fimbria cf. lajoyei d'Archiac 1843 clam
 Lucinida - Mactromyidae
 Pholadomyida - Pholadomyidae
Pholadomya lirata Sowerby 1818 clam
"Pholadomya protei" = Pholadomya (Bucardiomya) protei Brongniart 1821 clam
Homomya cf. gibbosa Sowerby 1814 clam
 Thraciida - Thraciidae
 Pholadida - Ceratomyidae
Gresslya ex gr. gregaria von Zieten 1833 clam
Ceratomya cf. concentrica Sowerby 1822 clam
Ceratomya excentrica Roemer 1836 clam
 Pholadida - Pleuromyidae
Pleuromya cf. alduini Brongniart 1821 clam
 Megalodontida - Dicerocardiidae
 Megalodontida - Ceratomyopsidae
 Cardiida - Cardiidae
 Carditida - Astartidae
"Astarte scytalis" = Seebachia (Eoseebachia) sowerbyana Holdhaus 1913 clam
 Trigoniida - Trigoniidae
Trigonia ex gr. pullus Sowerby 1826 clam
 Nuculida - Nuculidae
"Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis
"Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis Sowerby 1840 nut clam
Echinoidea
 Irregularia - Clypeidae
Pygurus smelliei sea urchin
 Irregularia -
Bothryopneustes orientalis sea urchin
=orientalis orientalis=Echin.
Bothryopneustes kauffmani sea urchin
=Echin.