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

Where: Saudi Arabia (25.5° N, 45.0° E: paleocoordinates 0.1° S, 33.4° 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 48405: authorized by Franz Fursich, entered by Simone Hicks on 18.03.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Anthozoa
 Scleractinia - Andemantastraeidae
Andemantastraea gaultierensis Koby 1906 stony coral
 Scleractinia - Haplaraeidae
Astraraea amorpha stony coral
Cephalopoda
 Nautilida - Paracenoceratidae
Paracenoceras sp. Spath 1927 nautiloid
=n.sp.A
Paracenoceras ex gr. prohexagonum Spath 1935 nautiloid
 Nautilida - Nautilidae
Eutrephoceras rotundum Crick 1898 nautiloid
 Ammonitida - Tulitidae
Tulites erymnoides Arkell 1952 ammonite
Tulites arabicus Arkell 1952 ammonite
 Ammonitida - Oppeliidae
Gastropoda
 Vetigastropoda - Discohelicidae
Discohelix sp. Dunker 1847 snail
 Pseudomelanoidea - Pseudomelaniidae
Pseudomelania sp. Pictet and Campiche 1862 snail
 Sorbeoconcha - Naticidae
"Ampullaria sp." = Natica (Ampullaria)
"Ampullaria sp." = Natica (Ampullaria) Lamarck 1799 moon snail
=Gastr.
 Heterostropha - Cylindrobullinidae
"Cylindrites sp." = Rugalindrites
"Cylindrites sp." = Rugalindrites Gründel and Nützel 2012 snail
 Heterostrophia -
"Nerinea bruntrutana" = Ptygmatis pseudobruntrutana
"Nerinea bruntrutana" = Ptygmatis pseudobruntrutana Gemmellaro 1865 snail
Bivalvia
 Arcida - Parallelodontidae
Parallelodon hirsonensis d'Archiac 1843 clam
 Pectinida - Limidae
"Plagiostoma gigantea" = Plagiostoma giganteum Sowerby 1814 file clam
Plagiostoma cf. subcardiiformis Greppin 1867 file clam
 Pectinida - Entoliidae
"Entolium cf. corneolum" = Entolium (Entolium) corneolum
"Entolium cf. corneolum" = Entolium (Entolium) corneolum Young and Bird 1828 scallop
 Pectinida - Pectinoidae
"Chlamys cf. textorius" = Chlamys textoria Schlotheim 1820 scallop
Camptonectes laminatus Sowerby 1818 scallop
 Ostreida - Bakevelliidae
 Ostreida - Palaeolophidae
"Lopha solitaria" = Actinostreon gregareum
"Lopha solitaria" = Actinostreon gregareum Sowerby 1816 oyster
 Ostreida - Gryphaeidae
Bilobissa sublobata Deshayes 1830 oyster
Gryphaea costellata Douvillé 1916 oyster
 Mytilida - Mytilidae
 Lucinida - Lucinidae
Fimbria cf. lajoyei d'Archiac 1843 clam
 Lucinida - Mactromyidae
 Pholadomyida - Pholadomyidae
Pholadomya lirata Sowerby 1818 clam
Pholadomya cf. ovalis Sowerby 1819 clam
"Pholadomya protei" = Pholadomya (Bucardiomya) protei Brongniart 1821 clam
Homomya cf. gibbosa Sowerby 1814 clam
 Thraciida - Thraciidae
 Pholadida - Ceratomyidae
Ceratomya excentrica Roemer 1836 clam
 Megalodontida - Dicerocardiidae
 Megalodontida - Ceratomyopsidae
 Cardiida - Cardiidae
 Carditida - Astartidae
 Trigoniida - Trigoniidae
Trigonia ex gr. pullus Sowerby 1826 clam
 Nuculida - Nuculidae
"Nucula ex gr. castor" = Nuculoma castor, "Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis
"Nucula ex gr. castor" = Nuculoma castor d'Orbigny 1850 nut clam
"Nucula cf. cuneiformis" = Nucula (Palaeonucula) cuneiformis Sowerby 1840 nut clam
Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
 Terebratulida - Lobothyrididae
"Cererithyris wylliei" = Tubithyris wylliei
"Cererithyris wylliei" = Tubithyris wylliei Weir 1929
Echinoidea
 Cidaroida - Rhabdocidaridae
Rhabdocidaris copeoides Agassiz and Desor 1847 pencil urchin
 Stomopneustoida - Stomechinidae
 Pedinoida -
 Euechinoidea - Hemicidaridae
 Holectypoida - Holectypidae
 Irregularia - Clypeidae
Clypeus sp. Leske 1778 sea urchin
=n.sp.
 Irregularia -
Bothryopneustes arabica sea urchin
=Echin.
Bothryopneustes dhrumaensis sea urchin
=Echin.
Bothryopneustes sp. Fourtau 1924 sea urchin
=n.sp.1=Echin.
 Calycina -
 Salenioida - Acrosaleniidae
Acrosalenia sp. Agassiz 1840 sea urchin
Acrosalenia humei sea urchin
Recrosalenia sp. sea urchin
=sp.2