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

Where: Saudi Arabia (25.1° N, 45.7° E: paleocoordinates 0.9° S, 33.7° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Atash Mb. Member (Dhruma Formation), Callovian (166.1 - 163.5 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 48563: authorized by Franz Fursich, entered by Simone Hicks on 23.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Foraminifera
 Textulariina - Pfenderinidae
 Ataxophragmiacea - Globotextulariidae
Pseudomarssonella sp. Redmond 1965
 Lituolacea - Nautiloculinidae
Nautiloculina sp. Mohler 1938
 Involutinina - Trocholinidae
Trocholina sp. Paalzow 1922
=Foram.
Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
Daghanirhynchia sp. Muir-Wood 1935
 Terebratulida - Eudesiidae
"Eudesia cardioides" = Eudesia (Sphriganaria) cardioides
"Eudesia cardioides" = Eudesia (Sphriganaria) cardioides Douvillé 1916
Bivalvia
 Nuculida - Nuculidae
"Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis
"Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis Sowerby 1840 nut clam
 Mytilida - Mytilidae
 Ostreida - Gryphaeidae
Gryphaea costellata Douvillé 1916 oyster
"Catinula knorri" = Gryphaea (Catinula) oyster
 Ostreida - Palaeolophidae
"Lopha solitaria" = Actinostreon gregareum
"Lopha solitaria" = Actinostreon gregareum Sowerby 1816 oyster
 Pectinida - Limidae
Plagiostoma cf. subcardiiformis Greppin 1867 file clam
 Pectinida - Pectinoidae
"Chlamys cf. textorius" = Chlamys textoria Schlotheim 1820 scallop
Camptonectes laminatus Sowerby 1818 scallop
 Pectinida - Entoliidae
"Entolium cf. corneolum" = Entolium (Entolium) corneolum
"Entolium cf. corneolum" = Entolium (Entolium) corneolum Young and Bird 1828 scallop
 Arcida - Parallelodontidae
Parallelodon hirsonensis d'Archiac 1843 clam
 Carditida - Astartidae
 Pholadomyida - Pholadomyidae
Pholadomya aff. lirata Sowerby 1818 clam
"Pholadomya protei" = Pholadomya (Bucardiomya) protei Brongniart 1821 clam
Pholadomya cf. ovalis Sowerby 1819 clam
Homomya cf. gibbosa Sowerby 1814 clam
 Thraciida - Thraciidae
 Cardiida - Cardiidae
 Megalodontida - Dicerocardiidae
 Pholadida - Pleuromyidae
Pleuromya cf. alduini Brongniart 1821 clam
 Lucinida - Mactromyidae
 Trigoniida - Trigoniidae
Trigonia ex gr. pullus Sowerby 1826 clam
Echinoidea
 Cidaroida -
Plegiocidaris sp. Pomel 1883 pencil urchin
 Euechinoidea - Hemicidaridae