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

Where: Saudi Arabia (25.2° N, 45.5° E: paleocoordinates 0.6° S, 33.7° 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 48402: authorized by Franz Fursich, entered by Simone Hicks on 18.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Tulitidae
Tulites sp.
Tulites sp. ammonite
=n.sp.
Bivalvia
 Pectinida - Pectinoidae
"Chlamys cf. textorius" = Chlamys textoria
"Chlamys cf. textorius" = Chlamys textoria Schlotheim 1820 scallop
 Ostreida - Pinnidae
Trichites sp.
Trichites sp. Lhuyd 1760 oyster
 Ostreida - Eligmidae
Eligmus sp.
Eligmus sp. Eudes-Deslongchampes 1856 oyster
 Lucinida - Mactromyidae
Mactromya cf. concentrica
 Pholadomyida - Pholadomyidae
Pholadomya sp.
Pholadomya sp. Sowerby 1823 clam
Echinoidea
 Pedinoida -
Farquharsonia crenulata
 Euechinoidea - Hemicidaridae
Pseudocidaris levis
 Holectypoida - Holectypidae
Holectypus depressus
 Salenioida - Acrosaleniidae
Acrosalenia sp., Recrosalenia sp.
Acrosalenia sp. Agassiz 1840 sea urchin
=sp.indet
Recrosalenia sp. sea urchin
=n.sp.2
 Calycina -
Leioechinus namus
Foraminifera
 Lituolacea - Nautiloculinidae
Nautiloculina sp.
Nautiloculina sp. Mohler 1938