Baranduz P20 (Oligocene of Iran)

Where: Iran (37.3° N, 44.9° E: paleocoordinates 31.2° N, 41.0° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: P20 foram zone, Qom Formation, Rupelian (33.9 - 28.1 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; limestone

• the sedimentary sequence of the formation is followed by thick-bedded and massive

•limestones. The larger foraminiferal assemblage is gradually dominated by hyaline forms belonging to Nummulites cf. fichteli, Michelotti 1841 (Plate I, Figure 1); Nummulites cf. vascus, Joly & Leymeri 1848 (Plate I, Figures 3 & 4); Neorotalia lithothamnica (Uhlig 1886) (Plate I, Figures 9 & 10); Operculina complanata (Defrance 1822) (Plate I, Figure 5); Heterostegina sp. (Plate I, Figure 2); Asterigerina sp. (Plate I, Figure 12); Planorbulina bronnimanni, Bignot & Decrouez 1982 (Plate I, Figures 8 & 13); Planorbulina sp., (Plate I, Figure 7); Victoriella conoidea (Rutten 1914) (Plate I, Figure 6) and Halkyardia minima, (Liebus 1911) (Plate I, Figure 11). The coralline alga Subterraniphyllum thomasii, Elliott 1957 (Plate II, Figure 13); red algal

•and coral fragments also coexist. The carbonate strata are topped by calcareous marls and argillaceous limestones. This interval is enriched by planktonic foraminifera including Turborotalia ampliapertura (Bolli 1957), Globigerina praebulloides, Blow 1959, Globigerina tripartita, Koch 1926, Paragloborotalia nana (Bolli 1957), Subbotina yeguaensis (Weinzierl & Applin 1929) and Chiloguembelina cubensis (Palmer 1934). Finally, the section is overlain by a polymictic conglomerate with an erosional base.

Size class: microfossils

Primary reference: M. Yazdi-Moghadam. 2011. Early Oligocene Larger Foraminiferal Biostratigraphy of the Qom Formation, South of Uromieh (NW Iran). Turkish Journal of Earth Sciences 20(6):847-856 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 138868: authorized by Mark Uhen, entered by Mark Uhen on 30.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Globigerinaceae - Globigerinidae
 Globigerinina - Chiloguembelinidae
 Globigerinina - Hedbergellidae