Well Khx-1, Muglad Basin, Sample Kh-12 (Cretaceous to of Sudan)

Where: West Kurdufan, Sudan (11.0° N, 27.7° E: paleocoordinates 9.5° S, 17.2° E)

• coordinate based on nearby landmark

When: Zone II (Barremian-Aptian) pollen zone, Bentiu Formation, Barremian to Barremian (129.4 - 113.0 Ma)

• Definition. The top of this zone is indicated by the last

•occurrence of Pilosisporites trichopapillosus and the

•occurrence of Afropollis zonatus, Leptolepidites psarosus,

•Concavissimisporites punctatus, Araucariacites

•australis, Cicatricosisporites spp. and Classopollis spp.

•Afropollis cf. operculatus and Concavissimisporites cf.

•variverrucatus are recorded from equivalent strata of

•the second study well, Khx-1.

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 145173: authorized by Carlos Jaramillo, entered by Gabriela Doria on 28.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Monocolpopollenites sp. Pflug and Thomson 1953
 Pinales - Araucariaceae
Gnetaceaepollenites spp. Thiergart 1938
 Ephedrales - Ephedraceae
Ephedripites spp. Bolkhovitina and Potonié 1958 jointfir
Ephedripites jansonii Muller 1968 jointfir
Ephedripites cf. multicostatus Brenner 1963 jointfir
 Coniferales - Cheirolepidiaceae
Classopollis spp. Pflug 1953
Afropollis jardinus
Afropollis jardinus Doyle et al. 1982
 Gnetales -
Steevesipollenites sinuosus Azema and Boltenhagen 1974 cycads
Pilosisporites trichopapillosus
Pilosisporites trichopapillosus Delcourt and Sprumont 1955
cf. Echinatisporis varispinosus Srivastava 1975
cf. Echinatisporis varispinosus
 Salviniales - Marsileaceae
 Schizaeales -
 Schizaeales - Schizaeaceae
Cicatricosisporites sp. Potonie and Gelletich 1933
cf. Ruffordiaspora australensis
Deltoidospora diaphana Wilson and Webster 1946
Gemmatriletes sp. Pierce 1961
 Algae -
 Cupressales - Pinidae