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

Where: Saudi Arabia (22.5° N, 46.0° E: paleocoordinates 3.2° S, 32.9° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Dhruma Formation (Shaqra Group), Bathonian (168.3 - 166.1 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 48300: authorized by Franz Fursich, entered by Simone Hicks on 16.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Echinoidea
 Cidaroida - Rhabdocidaridae
Rhabdocidaris mogharensis
 Irregularia -
Bothryopneustes dhrumaensis
Bothryopneustes dhrumaensis sea urchin
=Echin.
 Salenioida - Acrosaleniidae
Acrosalenia arabica
 Calycina -
Leioechinus namus
Gastropoda
 Trochoidea - Nododelphinulidae
Amphitrochus sp.
Amphitrochus sp. Cossmann 1907 snail
 Sorbeoconcha - Vermetidae
Vermetus sp.
Vermetus sp. Daudin 1800 worm shell
 Heterostropha - Nerineidae
Nerinea sp.
Nerinea sp. Deshayes 1827 snail
Bivalvia
 Ostreida - Gryphaeidae
Gryphaea sp.
Gryphaea sp. Lamarck 1801 oyster
 Pectinida - Pectinoidae
Chlamys sp.
Chlamys sp. Röding 1798 scallop
 Pholadida - Ceratomyidae
Gresslya sp.
Gresslya sp. Agassiz 1843 clam
 Cardiida - Pterocardiidae
Pterocardia buvignieri
 Megalodontida - Ceratomyopsidae
Ceratomyopsis sp.
Ceratomyopsis sp. Cossmann 1915 clam
 Megalodontida - Dicerocardiidae
Pseudisocardia sp.
Pseudisocardia sp. Douvillé 1912 clam
 Pholadomyida - Pholadomyidae
Pholadomya sp., Pholadomya lirata
Pholadomya sp. Sowerby 1823 clam
Pholadomya lirata Sowerby 1818 clam
 Thraciida - Thraciidae
Thracia sp.
Thracia sp. Blainville 1824 clam
Cephalopoda
 Nautilida - Paracenoceratidae
Paracenoceras ex gr. hexagonum
Paracenoceras ex gr. hexagonum Sowerby 1826 nautiloid
Nodosariata
 Nodosariida - Nodosariidae
Citharina sp.
Citharina sp. d'Orbigny 1839
 Vaginulinida - Vaginulinidae
Lenticulina sp.
Lenticulina sp. Lamarck 1804
Foraminifera
 Lituolacea - Nautiloculinidae
Nautiloculina oolithica
 Ataxophragmiacea - Globotextulariidae
Pseudomarssonella ex gr. bipartita, Pseudomarssonella reflexa
 Involutinina - Trocholinidae
Trocholina sp.
Trocholina sp. Paalzow 1922
=n.sp.1=Foram.