PBDB Collection

Razzak #7 well, Sample 109 (Cretaceous of Egypt)

Where: Western Desert, Egypt (31.0° N, 28.0° E: paleocoordinates 10.8° N, 23.3° E)

• coordinate estimated from map

When: Early/Lower Cenomanian (99.6 - 93.5 Ma)

Environment/lithology: open shallow subtidal; lithified, argillaceous shale and lithified, argillaceous sandstone

• Shallow marine, near shore with high terrestrial influence

• The formation is composed of variegated shales alternating with sandstones, siltstones and limestones. The shales are varicolored, thinly laminated, grayish green to green, calcareous and silty in part, and the siltstones and sandstones are grayish white to yellowish white, glauconitic and pyritic. These rocks represent a gradational fining upward sequence that is conformable with the overlying

•Abu Roash. Dated as early to middle Cenomanian (Hantar, 1990; Schrank and Ibrahim, 1995; Ibrahim,

•2002), about 170 m (560 ft) of the Bahariya Formation is encountered in the Razzak #7 well.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: chemical, hydrochloric, hydroflouric, sieve

Primary reference: M. Zobaa, C. Sanchez-Botero, C. Browne, F. E. Oboh-Ikuenobe, and M. I. Ibrahim. 2008. Kerogen and palynomorph analyses of the mid-Cretaceous Bahariya Formation and Abu Roash “G” Member, North Western Desert, Egypt. Gulf Coast Association of Geological Societies Transactions 58:933-943 [C. Jaramillo/G. Doria/A. Cardenas ]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 145107: authorized by Carlos Jaramillo, entered by Gabriela Doria on 26.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

unclassified
-	Michrystridium spp., Millodoudodinium sp. Michrystridium spp. Millodoudodinium sp.
Dinophyceae
Peridiniales - Peridiniaceae	Subtilisphaera spp., Subtilisphaera perlucida Subtilisphaera spp. Jain and Millepied 1971 Subtilisphaera perlucida Jain and Millepied 1973
-	Spiniferites ramosus Spiniferites ramosus Lentin and Williams 1973
Gonyaulacales - Gonyaulacaceae	Coronifera oceanica, Florentinia sp., Florentinia cooksioniae, Oligosphaeridium complex, Kallosphaeridium sp. Coronifera oceanica Cookson and Eisenack 1958 Florentinia sp. Davey and Verdier 1973 Florentinia cooksioniae Oligosphaeridium complex Davey and Williams 1966 Kallosphaeridium sp. De Coninck 1969
Gonyaulacales - Areoligeraceae	Cyclonephelium vannophorum Cyclonephelium vannophorum Davey 1969
Polypodiopsida
- Marsileaceae	Crybelosporites pannuceus Crybelosporites pannuceus Srivastava 1977
- Gleicheniaceae	Gleicheniidites senonicus Gleicheniidites senonicus Ross 1949
Schizaeales - Polypodiidae	Cicatricosisporites orbiculatus Cicatricosisporites orbiculatus Singh 1964
Pteridopsida
-	Deltoidospora minor Deltoidospora minor Pocock 1970
Ginkgoopsida
Ephedrales -	Ephedripites spp. Ephedripites spp. Bolkhovitina and Potonié 1958
Cycadopsida
Cycadales -	Eucommiidites troedsonii Eucommiidites troedsonii cycads
Gnetales -	Alaticolpites limai Alaticolpites limai Regali et al. 1975 elaterate
Equisetopsida
Cupressales - Pinidae	"Spheripollenites psilatus" = Sphaeripollenites "Spheripollenites psilatus" = Sphaeripollenites
Pinidae - Pinidae	Araucariacites australis, Classopollis torosus Araucariacites australis Cookson 1947 Classopollis torosus Burger 1965
Angiospermae
-	Afropollis jardinus Afropollis jardinus Doyle et al. 1982
Alismatales -	Pennipollis peroreticulatus, Pennipollis reticulatus Pennipollis peroreticulatus Friis et al. 2000 Pennipollis reticulatus Friis et al. 2010
-	Retimonocolpites variplicatus Retimonocolpites variplicatus Schrank and Mahmoud 1998
Chloranthales - Chloranthaceae	Clavatipollenites hughesii Clavatipollenites hughesii Kemp 1968