Razzak #7 well, Sample 91 (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: Abu Roash "G" Member, Late/Upper 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 145125: 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.
Equisetopsida
 Pinidae - Pinidae
Araucariacites australis, Classopollis torosus
Classopollis torosus Burger 1965
 Cupressales - Pinidae
"Spheripollenites psilatus" = Sphaeripollenites
"Spheripollenites psilatus" = Sphaeripollenites
Angiospermae
  -
Retimonocolpites variplicatus, Afropollis jardinus
Retimonocolpites variplicatus Schrank and Mahmoud 1998
Afropollis jardinus Doyle et al. 1982
Polypodiopsida
  - Marsileaceae
Crybelosporites pannuceus
Crybelosporites pannuceus Srivastava 1977
 Schizaeales - Polypodiidae
Cicatricosisporites orbiculatus
Pteridopsida
  -
Deltoidospora minor
Deltoidospora minor Pocock 1970
Ginkgoopsida
 Ephedrales -
Ephedripites spp.
Ephedripites spp. Bolkhovitina and Potonié 1958
Cycadopsida
 Gnetales -
Alaticolpites limai
Alaticolpites limai Regali et al. 1975 elaterate
 Cycadales -
Eucommiidites troedsonii
Dinophyceae
 Peridiniales - Peridiniaceae
Subtilisphaera spp.
Subtilisphaera spp. Jain and Millepied 1971
  -
Spiniferites ramosus
Spiniferites ramosus Lentin and Williams 1973
 Gonyaulacales - Gonyaulacaceae
Coronifera oceanica, Oligosphaeridium complex, Florentinia sp., Florentinia cooksioniae, Kallosphaeridium sp.
Coronifera oceanica Cookson and Eisenack 1958
Oligosphaeridium complex Davey and Williams 1966
Florentinia sp. Davey and Verdier 1973
Kallosphaeridium sp. De Coninck 1969