Well Azx-1, Muglad Basin, Sample Az-12: Aptian - Albian, Sudan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Equisetopsida - Cupressales
Equisetopsida - Cheirolepidiaceae
Classopollis spp. Pflug 1953
Equisetopsida - Araucariaceae
Balmeiopsis limbatus (Balme 1957)
unclassified
Monocolpopollenites sp. Pflug and Thomson 1953
Ginkgoopsida - Ephedrales
Ephedripites spp. Bolkhovitina and Potonié 1958
Polypodiopsida - Blechnaceae
Leptolepidites sp. Couper 1953
Polypodiopsida - Schizaeales - Schizaeaceae
Cicatricosisporites spp. Potonie and Gelletich 1933
Polypodiopsida - Marsileaceae
Polypodiopsida - Gleicheniaceae
unclassified
Pilosisporites trichopapillosus Delcourt and Sprumont 1955
Angiospermae
unclassified
see common names

Geography
Country:Sudan State/province:South Kurdufan
Coordinates: 11.0° North, 27.7° East (view map)
Paleocoordinates:6.6° South, 28.4° East (Wright 2013)
Basis of coordinate:based on nearby landmark
Altitude:434 meters
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Aptian - Albian 10 m.y. bin: Cretaceous 3 - Cretaceous 4
Key time interval: Aptian - Albian Pollen zone:  Zone III (Apt.-Alb.)
Age range of interval: 121.4 - 100.5 m.y. ago
Stratigraphy
Formation:Bentiu
Local section:Muglad Basin Local bed:1830 m
Local order:top to bottom
Stratigraphy comments: Reference section. Azx-1, depth 1580 m (sample Az
04).
Definition. The top of this zone is marked by the last
occurrence of Crybelosporites cf. pannuceus and the
occurrence of abundant Classopollis spp., Ephedripites
jansonii, Ephedripites cf. multicostatus and Araucariacites
australis.
Suggested age. Albian–Cenomanian.
Discussion. The African range of Crybelosporites pannuceus
is restricted to the Albian and Cenomanian (Lawal
and Moullade 1986; Awad 1994; Schrank and Ibrahim
1995; Schrank and Mahmoud 1998) and from the same
interval in northern South America (e.g. Brenner 1968;
Regali et al. 1974). The occurrence of Ephedripites
jansonii within the Albian/Cenomanian interval is
evident, e.g. in Sudan (Awad 1994; Eisawi et al. 2009),
in Brazil (Traverse 1988) and in Nigeria (Lawal and
Moullade 1986). Classopollis spp. and Araucariacites
australis are common in this interval
Lithology and environment
Primary lithology: lithified sandstone
Lithology description: 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).
Environment:fluvial-lacustrine indet.
Taphonomy
Modes of preservation:soft parts,original sporopollenin
Size of fossils:microfossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:chemical,hydrochloric,hydroflouric,sieve
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:145160
Authorizer:C. Jaramillo Enterer:G. Doria, P. Santamarina
Modifier:P. Santamarina Research group:paleobotany
Created:2013-05-28 04:19:07 Last modified:2025-02-22 15:12:02
Access level:the public Released:2013-05-28 04:19:07
Creative Commons license:CC0
Reference information

Primary reference:
46944. 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. Cárdenas]