Well Azx-1, Muglad Basin, Sample Az-36 (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 172864: authorized by Carlos Jaramillo, entered by Patricio Santamarina on 27.08.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Monocolpopollenites sp. Pflug and Thomson 1953
 Ephedrales - Ephedraceae
Ephedripites spp. Bolkhovitina and Potonié 1958 jointfir
Ephedripites jansonii Muller 1968 jointfir
Ephedripites cf. multicostatus Brenner 1963 jointfir
 Salviniales - Marsileaceae
 Schizaeales - Schizaeaceae
Cicatricosisporites spp. Potonie and Gelletich 1933
Cingulatisporites "sp. SCI 170" Thomson et al. 1953
Leptolepidites sp. Couper 1953
  - Selaginellaceae
? Densoisporites sp. Dettmann 1963
 Sphaerocarpales -
Balmeiopsis limbatus
Balmeiopsis limbatus Archangelsky 1977