Pabdeh Formation

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Pabdeh Formation
Stratigraphic range: Late Eocene to Early Oligocene, 37.7–28 Ma
TypeFormation
Unit ofZagros fold and thrust belt
UnderliesAsmari Formation
OverliesGurpi Formation
Lithology
PrimaryMarl, limestone
OtherOil shales
Location
CountryIran

The Pabdeh Formation is a Late Eocene to Early Oligocene-aged[1][2] geological formation in Iran. It outcrops along the Zagros Mountains. It was deposited in a deepwater environment in the upper bathyal zone of the Paratethys Sea,[3] with these abyssal sediments being lifted high above sea level from the uplift of the Zagros fold and thrust belt as part of the Alpide orogeny.

A high number of fossil fishes are known from this formation, the majority of which appear to have pelagic and deepwater affinities. These are mostly known from two localities near Elam and Istehbanat.[4] The age of these localities have been disputed, and have previously been considered to be Early Oligocene, but are now generally thought to be middle to late Eocene in age, most likely Priabonian.[5] Some fossils of migratory insects (a locust and ant alates), as well as fish and birds, are also known from presumed early Oligocene-aged strata near Babaheidar.[3]

Paleobiota

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Cartilaginous fishes

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Genus Species Notes Images
Xiphodolamia X. serrata A xiphodolamiid shark.[6] File:Xiphodolamia.jpg

Bony fishes

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Based primarily on Arambourg (1967), with taxonomic changes made where necessary:[4]

Genus Species Locality Notes Images
Aluvarus A. praeimperialis Elam The larva of a percomorph of uncertain affinities, once thought to be a louvar relative.[7] File:Aluvarus praeimperialis.jpg
Arambourgthurus A. scombrurus Istehbanat A surgeonfish. One of the only known surgeonfish to inhabit a pelagic ecosystem.[8]
Argyropelecus A. iranicus Babaheidar A marine hatchetfish.[9] File:Argyropelecus iranicus.png
A. zagrosensis File:Argyropelecus zagrosensis.png
?Astronesthes ?A. simus Elam An apparent stareater, taxonomic affinity uncertain. File:Astronesthes niger.jpg
Babelichthys B. olneyi Elam A bizarre crestfish.[10] File:Babelichthys olneyi (cropped).png
Berycomorus B. firdoussi Elam A beryciform.
Bregmaceros B. filamentosus Elam A codlet. File:Bregmaceros filamentosus 34 maf olig romania.jpg
Caucasiganus C. sp. Istehbanat A relative of rabbitfish.[11]
Cheilinus C. longifillis Istehbanat A wrasse. File:Cheilinus undulatus by Eva Hejda.jpg
Cottopsis C. gaudryi Elam An oceanic basslet.[12]
Dussumieria D. elami Elam A rainbow sardine. File:Dussumieria acuta Achilles 166.jpg
Eosternoptyx E. discoidalis Elam A deep-sea hatchetfish.[13]
Epinnula E. cancellata Elam A snake mackerel. File:Epinnula magistralis.jpg
Etrumeus E. hafizi Istehbanat A round herring. File:Naturalis Biodiversity Center - RMNH.ART.146 - Etrumeus teres De Kay - Kawahara Keiga - 1823 - 1829 - Siebold Collection - pencil drawing - water colour 1.jpeg
Grammatorcynus G. scomberoides Istehbanat, Elam A mackerel. File:Grammatorcynus bilineatus.jpg
Iraniplectus I. bakhtiari Babaheidar A pufferfish-like tetraodontiform.[14] File:Iraniplectus bakhtiari.jpg
Maurolicus M. morgani Elam A pearlside. File:Maurolicus muelleri (Pearlsides).gif
?Myroconger ?M. rouslami Elam An apparent thin eel, taxonomic affinity uncertain. File:Myroconger compressus.png
Opisthonema O. persicum Elam A thread herring. File:Opisthonema oglinum Choptank 090220DSC 0001 (50376710368).jpg
Palaeorhynchus P. altivelis Istehbanat A palaeorhynchid billfish. File:Palaeorhynchus altivelis.JPG
Palimphyes (=Dipterichthys) P. nematophorus Elam A euzaphlegid.[15] File:Palimphyes sp 34 maf olig romania.jpg
P. leptosomus
Paucaichthys P. elamensis Elam A pomfret.[16]
Praewoodsia P. mesogeae Elam A bristlemouth.
Priacanthopsis P. crassispinus Elam A bigeye.
Proserrivomer P. mecquenemi Elam A sawtooth eel.
Propteridium P. douvillei Elam A viviparous brotula.
Pristigenys P. macropus Istehbanat A bigeye. File:Pristigenys meyeri.jpg
Protolophotus P. elami Elam A crestfish. File:†Protolophotus elami, holotype MNHN.F.EIP10d.png
?Psenes ?P. macrolepis Elam A driftfish, taxonomic identity uncertain. File:Psenes maculatus.jpg
Pseudoholocentrum P. cristatum Elam A holocentrid.
Rybapina R. orientalis Elam A driftfish.[17][18]
Scomber S. saadii Istehbanat A mackerel. File:Scomber japonicus.png
Scomberomorus S. speciosus Istehbanat A mackerel. File:Scomberomorus cavalla.png
Scopeloides S. glarisianus Elam A bristlemouth. File:Scopeloides glarisianus 34 maf olig romania.jpg
Sphyraena S. longimana Istehbanat A barracuda. File:Spbar u0.gif
Thyrsitoides T. zarathoustrae Elam A relative of the blacksail snake mackerel. File:Bryan Meehan Blacksail Snake Mackerl 2024.jpg
?Urosphen ?U. iranensis Elam A urosphenid syngnathiform. File:Urosphen dubia.jpg

Birds

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Genus Species Locality Notes Images
Diomedeoides (=Frigidafrons) D. babaheydariensis Babaheidar A diomedeoidid seabird.[19] File:Diomedeoides.jpg

Arthropods

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Crustaceans

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Based on Garassino, Bahrami, Yazdi & Vega (2014):[20]

Genus Species Locality Notes Images
Eogordonella E. iranianiensis Babaheidar A solenocerid shrimp.
Eopabdehus E. babaheydariensis A penaeid shrimp.
Parsacus P. eocenicus A slipper lobster.

Insecta

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Genus Species Locality Notes Images
Acrididae indet. Babaheidar A short-horned grasshopper of uncertain affinities, potentially in a migratory locust-like phase.[3]
Formicidae indet. A potentially myrmicine ant of uncertain affinities, migratory alates.[3]

References

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  14. ^ Tyler, J.C.; Mirzaie, M.; Nazemi, A. (2006). New genus and species of basal tetraodontoid puffer fish from the Oligocene of Iran, related to the Zignoichthyidae (Tetraodontiformes). Bollettino del Museo Civico di Storia Naturale di Verona Geologia Paleontologia Preistoria, 30, 49-58
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