Well Azx-1, Muglad Basin, Sample Az-12 (Cretaceous to of Sudan)

Where: South Kurdufan, Sudan (11.0° N, 27.7° E: paleocoordinates 10.2° S, 17.8° E)

• coordinate based on nearby landmark

When: Zone III (Apt.-Alb.) pollen zone, Bentiu Formation, Aptian to Aptian (125.0 - 100.5 Ma)

• Reference section. Azx-1, depth 1580 m (sample Az


•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


•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

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 145160: authorized by Carlos Jaramillo, entered by Gabriela Doria on 28.05.2013, edited by Patricio Santamarina

Creative Commons license: CC BY (attribution)

Taxonomic list

Monocolpopollenites sp. Pflug and Thomson 1953
 Pinales - Araucariaceae
 Pinales - Cheirolepidiaceae
Classopollis spp. Pflug 1953
 Ephedrales - Ephedraceae
Ephedripites spp. Bolkhovitina and Potonié 1958 jointfir
Ephedripites jansonii Muller 1968 jointfir
Pilosisporites trichopapillosus
Pilosisporites trichopapillosus Delcourt and Sprumont 1955
 Salviniales - Marsileaceae
 Schizaeales - Schizaeaceae
Cicatricosisporites spp. Potonie and Gelletich 1933
 Gleicheniales - Gleicheniaceae
 Gymnospermophyta -
Balmeiopsis limbatus
Balmeiopsis limbatus Archangelsky 1977
 Cupressales - Pinidae