Shaqra Group (lower Dhruma D2,1a) (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 45266: authorized by Franz Fursich, entered by Simone Hicks on 17.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Cephalopoda
 Nautilida - Nautilidae
Eutrephoceras aff. waageni Gemmellaro 1886 nautiloid
 Ammonitida - Sonniniidae
Gastropoda
 Architaenioglossa - Ampullinidae
Globularia sp. Swainson 1840 snail
Globularia hemisphaerica Roemer 1836 snail
Bivalvia
 Pectinida - Pectinoidae
 Ostreida - Pinnidae
 Ostreida - Eligmidae
Eligmus polytypus Eudes-Deslongchamps 1856 oyster
 Mytilida - Mytilidae
Modiolus bipartitus Sowerby 1818 mussel
 Pholadomyida - Pholadomyidae
Pholadomya cf. aubryi Douville 1886 clam
Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
Burmirhynchia sp. n. sp. Buckman 1917
=n.sp.1
 Terebratulida - Zeilleriidae
Ostracoda
 Platycopida - Cytherellidae
  -
Amicytheridea dhrumaensis n. sp. ostracod
=Ostrac.
Echinoidea
 Salenioida - Acrosaleniidae