Well Azx-1, Muglad Basin, Sample Az-33 (Cretaceous to of Sudan)

Where: South Kurdufan, Sudan (11.0° N, 27.7° E: paleocoordinates 8.1° S, 16.3° E)

• coordinate based on nearby landmark

When: Abu Gabra Formation, Neocomian to Neocomian (145.0 - 125.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified sandstone

• The successions in several deep wells in the Muglad Basin consist of thick Lower Cretaceous to Paleogene–Neogene strata of claystones, fluvio-lacustrine sandstones and siltstones (Schull 1988). Based on seismic and log interpretations, twelve formations are distinguished in the Muglad Basin of which thick beds of shales and claystones interbedded with fine sandstones and siltstones constitute the Abu Gabra Formation (Neocomian–Aptian), the main source rock in the Muglad Basin. The reservoir rock is the thick sandstone sequence of the Bentiu Formation (Aptian–Cenomanian).

Size class: microfossils

Preservation: soft parts, original sporopollenin

Collection methods: chemical, hydrochloric, hydroflouric, sieve

Primary reference: A. A. M. Eisawi, A. B. Ibrahim, O. B. A. Rahim and E. Schrank. 2012. Palynozonation of the Cretaceous to Lower Paleogene Strata of the Muglad Basin, Sudan. Palynology 36(2):191-207 [C. Jaramillo/G. Doria/A. Cardenas ]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 172859: authorized by Carlos Jaramillo, entered by Patricio Santamarina on 27.08.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Monocolpopollenites
  -
Monocolpopollenites sp.
Monocolpopollenites sp. Pflug and Thomson 1953
Equisetopsida
 Pinidae - Pinidae
Dicheiropollis etruscus, Classopollis spp., Balmeiopsis limbatus
Classopollis spp. Pflug 1953
 Cupressales - Pinidae
"Spheripollenites scabratus" = Sphaeripollenites
"Spheripollenites scabratus" = Sphaeripollenites
Gnetaceaepollenites
  -
Gnetaceaepollenites fissuratus
Cycadopsida
 Gnetales -
Steevesipollenites sinuosus
Steevesipollenites sinuosus Azema and Boltenhagen 1974 cycads
Ginkgoopsida
 Ephedrales -
Ephedripites sp., Ephedripites cf. multicostatus, Ephedripites jansonii
Ephedripites sp. Bolkhovitina and Potonié 1958
Ephedripites jansonii Muller 1968
Concavissimisporites
  -
Concavissimisporites punctatus
Angiospermae
  -
Stellatopollis densiornatus
Lycopodiopsida
 Selaginellales -
? Densoisporites sp.
? Densoisporites sp. Dettmann 1963 clubmoss
Polypodiopsida
  - Blechnaceae
Leptolepidites sp., Leptolepidites psarosus
Leptolepidites sp. Couper 1953
  -
Verrucosisporites rotundus
 Schizaeales - Polypodiidae
Cicatricosisporites spp., Cicatricosisporites salardii, Cicatricosisporites cf. australiensis
Cicatricosisporites spp. Potonie and Gelletich 1933
Pteridopsida
  -
Cingulatisporites "sp. SCI 170"
Cingulatisporites "sp. SCI 170" Thomson et al. 1953
Dinophyceae
 Peridiniales - Peridiniaceae
Holmwoodinium notatum