Shaqra Group (lower Dhruma D1,2) (Jurassic of Saudi Arabia)

Where: Saudi Arabia (24.2° N, 46.6° E: paleocoordinates 2.0° S, 34.1° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Dhruma Formation (Shaqra Group), Bajocian (170.3 - 168.3 Ma)

Environment/lithology: lagoonal or restricted shallow subtidal; lithified 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 45241: authorized by Franz Fursich, entered by Simone Hicks on 15.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Euechinoidea - Hemicidaridae
Sphaerotiaris sp.
Sphaerotiaris sp. Lambert and Thiéry 1914 sea urchin
=sp.A
Bivalvia
 Pholadida - Ceratomyidae
Ceratomya cf. excentrica
Ceratomya cf. excentrica Roemer 1836 clam
 Pholadomyida - Pholadomyidae
Pholadomya cf. ovalis
Pholadomya cf. ovalis Sowerby 1819 clam
 Arcida - Parallelodontidae
Parallelodon hirsonensis
Parallelodon hirsonensis d'Archiac 1843 clam
 Pectinida - Limidae
"Plagiostoma gigantea" = Plagiostoma giganteum
"Plagiostoma gigantea" = Plagiostoma giganteum Sowerby 1814 file clam
 Ostreida - Ostreidae
Gryphaea bilobata
Gryphaea bilobata Sowerby 1835 oyster
Cephalopoda
 Ammonitida - Graphoceratidae
Hyperlioceras sp.
 Ammonitida - Sonniniidae
Sonninia sp., Sonninia arabica, Sonninia sp. n. sp., Sonninia sp. n. sp., Sonninia (Euhoploceras) omphalica
Sonninia sp. Douvillé 1879 ammonite
=ssp.
Sonninia sp. n. sp. Douvillé 1879 ammonite
=n.sp.1 gr. arabica
Sonninia sp. n. sp. Douvillé 1879 ammonite
=n.sp.2
Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
Burmirhynchia sp. n. sp.
Burmirhynchia sp. n. sp. Buckman 1917
=n.sp.1