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

Where: Saudi Arabia (23.1° N, 46.3° E: paleocoordinates 2.9° S, 33.4° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Dhibi Lst. Member (Dhruma Formation), 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 48088: 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 - Nucleolitidae
Nucleolites sp.
Nucleolites sp. Lamarck 1801 sea urchin
=n.sp.1
Rhynchonellata
 Terebratulida - Lobothyrididae
Tubithyris chouberti
Tubithyris chouberti Rousselle 1965
 Terebratulida - Lissajousithyrididae
Monsardithyris ventricosa
Gastropoda
 Sorbeoconcha - Naticidae
Natica sp.
Natica sp. Scopoli 1777 moon snail
 Pleurotomarioidea - Pleurotomariidae
Pleurotomaria sp.
Pleurotomaria sp. Defrance 1826 snail
Cephalopoda
 Ammonitida - Stephanoceratidae
Ermoceras coronatoides
Ermoceras coronatoides Douvillé 1916 ammonite
Bivalvia
 Pholadomyida - Pholadomyidae
Homomya cf. gibbosa
Homomya cf. gibbosa Sowerby 1814 clam
 Ostreida - Palaeolophidae
"Lopha gregarea" = Actinostreon gregareum
"Lopha gregarea" = Actinostreon gregareum Sowerby 1816 oyster