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

Where: Saudi Arabia (23.3° N, 46.3° E: paleocoordinates 2.7° S, 33.5° 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 48078: authorized by Franz Fursich, entered by Simone Hicks on 13.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Irregularia - Clypeidae
Clypeus sp.
Clypeus sp. Leske 1778 sea urchin
=sp.3
 Salenioida - Acrosaleniidae
Acrosalenia sp.
Acrosalenia sp. Agassiz 1840 sea urchin
=sp.A
Gastropoda
 Architaenioglossa - Ampullinidae
"Ampullospira sp." = Ampullina (Ampullospira)
"Ampullospira sp." = Ampullina (Ampullospira) Harris 1897 snail
Bivalvia
 Trigoniida - Trigoniidae
Trigonia ex gr. pullus
Trigonia ex gr. pullus Sowerby 1826 clam
 Ostreida - Eligmidae
Eligmus polytypus
Eligmus polytypus Eudes-Deslongchamps 1856 oyster
Cephalopoda
 Ammonitida - Sonniniidae
Dorsetensia sp.
 Ammonitida - Stephanoceratidae
Cadomites sp.
Cadomites sp. ammonite
Rhynchonellata
 Terebratulida - Zeilleriidae
Zeilleria waltoni
Zeilleria waltoni Davidson 1851