ACTA PALAEONTOLOGICA ROMANIAE
Acta Palaeontologica Romaniae, Vol. 15 (2) 2019 - Online Articles 
PRINT ISSN 1842-371x

FELIX SCHLAGINTWEIT, KOOROSH RASHIDI, HAMED YARAHMADZAHI, SHARAM HABIBIMOOD, MAHNAZ AMIRSHAHKARMI, HOSSAIN AHMADI & HOSSAIN KHOKAN
DISSOCLADELLA? CHAHTORSHIANA RASHIDI & SCHLAGINTWEIT N. SP., A NEW DASYCLADALE (GREEN ALGAE) FROM THE PALEOCENE OF IRAN

Acta Palaeontologica Romaniae, 15 (2), 2019: 3 - 13
doi: https://doi.org/10.35463/j.apr.2019.02.01

Abstract A new Dasycladale is described as Dissocladella? chahtorshiana Rashidi & Schlagintweit n. sp. from Selandian carbonates of Mount Chah Torsh, Central Iran (type locality). Other occurrence is from the Sistan Suture Zone of Eastern Iran (Selandian?, Thanetian?). The medium-sized taxon displays cylindrical to slightly claviform thalli with a relatively large main axis bearing alternating primaries of variable shape. The latter show either slowly widening towards the distal end or are club-shaped displaying very short secondaries. The morphological variability of the primaries, both typical and atypical for Dissocladella, account for some doubts on the generic assignment of the new species. Dissocladella? chahtorshiana occurs in bioclastic packstones with Cymopolia mayaense Johnson & Kaska, Acroporella cf. anceps Segonzac, Halimeda sp., and benthic foraminifera (e.g., soritiids) at its type locality.
Keywords: Green algae, Yazd Block, Paleogene, taxonomy, biostratigraphy

available online
08. 07. 2019

MEHDI HADI, AMIR SALAHI, YAGHUB NASIRI & HOSSEIN MOSADDEGH
SOKOLOWIA HORIZON OF THE ZIARAT FORMATION (EASTERN ALBORZ, IRAN): BIOSTRATIGRAPHIC AND PALEOGEOGRAPHIC IMPLICATIONS
Acta Palaeontologica Romaniae, 15 (2), 2019: 15 - 27
doi: https://doi.org/10.35463/j.apr.2019.02.02

Abstract The present study deals with molluscan accumulations of the Sokolowia horizon, which is a key-bed in the middle Eocene of the Kalateh section (Ziarat Formation, Eastern Alborz, Iran). The age of this -key horizon- is attributed to Bartonian based on presence of larger benthic foraminifera species such as Nummulites lyelli (D'Archiac & Haime), Orbitoclypeus zitteli (Checchia-Rispoli) and Asterocyclina stella stella (Gumbel) immediately below it. The paleogeographic distribution of Sokolowia occurrence from Tarim Basin in eastern Central Asia to the Transylvanian Basin in southeastern Europe indicates a middle Eocene seaway along the southern margin of an Eurasian epicontinental sea. In particular, the comparison of middle Paleogene sequences in different Central Asian regions reveals an apparent similarity between those basins pointing to their genetic relationship.
Keywords: Sokolowia; larger benthic foraminifera; Central Asia; Eastern Alborz

available online
14. 07. 2019

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