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Stratigraphy and palaeoceanography of late Pleistocene molluscs from the northern coast of the Persian Gulf

Gholamalian Hossein, Hassani Mohammad-Javad, Keshavarz Musa

Geological Quarterly

2022

Vol. 66, No. 2

art. no. 17

We report an extraordinary discovery of marine Pleistocene strata from the north of the Persian Gulf. The Dayyer section contains a rich molluscan fauna including 26 bivalve species, Sr87/Sr86 data showing that the succession is not older than 153 ka (late Pleistocene). These strata are time-equivalents of the Bakhtiari Formation, but have a very different fossil content and facies. Comparing the Dayyer molluscan community to the present-day fauna of the Persian Gulf shows that many fossil species are absent in the recent waters. The palaeoceanographic distribution of the identified bivalves shows the presence of many of them in the Plio-Pleistocene strata of the Mediterranean Basin. This may point to a temporary connection between the Persian Gulf and Mediterranean Basin during the late Pleistocene and the extinction of many bivalves in the past 153 ka

Miocene Argonautidae (Octopoda) from the Persian Gulf area and their palaeogeographic distribution

Gholamalian Hossein, Hassani Mohammad-Javad, Hosseinipour Fatemeh

Acta Geologica Polonica

2020

Vol. 70, no. 1

135--145

Cephalopod specimens assigned to the Argonautidae (Obinautilus pulchra Kobayashi, 1954 and an unknown taxon) from two localities of the Mishan Formation in Gohreh and Khorgu sections, Bandar Abbas, southern Iran, are reported for the first time from the Persian Gulf area. The co-existing foraminifera confirm the middle Miocene age of the strata. Based on micropalaeontological data, the previous Oligocene age of Obinautilus pulchra is extended to the middle Miocene. The palaeobiogeographic distribution of the reported Argonautidae shows that the presence of these faunas is limited to the West Pacific, Indo-Pacific and the East Pacific. The present-day distribution of the Argonautidae is similar to the ancient one and seems to be inherited from their ancestors.