GPSW-7 WELL, Sample 20 (Cretaceous of Egypt)

Where: north Western Desert, Egypt (30.0° N, 28.0° E: paleocoordinates 11.7° N, 23.2° E)

• coordinate estimated from map

When: Ephedripites ambiguus-Ephedripites multicostatus-Foveotricolpites giganteus- Foveotricolpites gigantoreticulatus pollen zone, E Member (Abu Roash Formation), Early/Lower Turonian (93.5 - 89.3 Ma)

Environment/lithology: shallow subtidal; lithified, gray, calcareous limestone and lithified, black, calcareous shale

• A return to the shallow marine depositional conditions of the previous phase that culminated in the Abu Roash G Member marked the advent of the Turonian Abu Roash E and D Members (GPC, 1994). This is supported palynologically by the onset of a very high terrestrial/fresh-water influx (Fig. 5A, B), based on the presence of brackish/fresh-water algal bodies Botryococcus and Pediastrum deposited in a proximal shelf.

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: core, chemical

Primary reference: S. El Beialy, H. S. El Atfy, M. S. Zavada, E. M. El Khoriby, and R. H. Abu-Zied. 2010. Palynological, palynofacies, paleoenvironmental and organic geochemical studies on the Upper Cretaceous succession of the GPTSW-7 well, North Western Desert, Egypt. Marine and Petroleum Geology 27:370-385 [C. Jaramillo/G. Doria/G. Doria]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 140398: authorized by Carlos Jaramillo, entered by Gabriela Doria on 09.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Ginkgoopsida
 Ephedrales - Ephedraceae
Ephedripites multicostatus Brenner 1963 jointfir
Gabonisporis vigourouxii
  -
Gabonisporis vigourouxii Boltenhagen 1967
Dinophyceae
 Gonyaulacales - Gonyaulacaceae
Oligosphaeridium cf. complex Davey and Williams 1966