ACTA PALAEONTOLOGICA ROMANIAE
Acta Palaeontologica Romaniae, Vol. 13 (2) 2017 - Online Articles
PRINT ISSN 1842-371x
Abstract Two new larger benthic foraminifera, Flabelloperforata tarburensis n. gen., n. sp. (?family Biokovinidae), and Persiella pseudolituus n. gen., n. sp. (?family Spirocyclinidae), are described systematically from the upper Maastrichtian of the Tarbur Formation of the Zagros Zone, SW Iran. They occur in diverse foraminiferal wackestone-packstone microfacies, together with other larger benthic foraminifera, rudist debris and dasycladalean algae. Flabelloperforata n. gen. is characterized by its flabelliform test, chambers without any structures (no exo- and endoskeleton), and a thin, microgranular-finely agglutinating wall displaying a pseudokeriotheca-like texture. Persiella n. gen. is characterized by its planispirally-involute and biumbilicate enrolled test, a finely agglutinating wall with thin im-perforate epiderm underlain by a layer displaying pseudokeriotheca-like texture. The exoskeleton is thick, deep and forms a network that in tangential sections displays a rounded pattern. An endoskeleton is absent. Potential ancestral, seemingly more primitive forms of the new Maastrichtian taxa might be Flabellocyclolina Gendrot and Pseudocyclammina Yokoyama respectively. The new discoveries enrich the diverse associations of (large) benthic foraminifera in the Tarbur Formation of Iran, and give further evidence for a diversification peak (biodiversity hotspot) and provincialism in the Maastrichtian of the Arabian plate with many newcomer genera and species.
FELIX SCHLAGINTWEIT & KOOROSH RASHIDI
PAULIAN DUMITRICĂ & SIMONA SAINT MARTIN
Abstract. A new diatom species, Entogonia briggeri n. sp. is described from Middle Miocene sediments of Romania. Detailed morphological investigations are presented using scanning electron microscopy with particular attention for internal coil system. This new species is compared with two related taxa E. formosa (Truan & Witt) Bergon described from the Middle Eocene sediments from Conset, Barbados and E. hungarica Holmes & Brigger 1979 from the Miocene sediments from Szurdokpuspoki, Hungary. This new species allows extending occurrences area of the genus and its time span distribution, as well as some remarks on some morphological elements of the genus.
Abstract The systematic study of the Mid-Miocene Petrified Forest of Zarand, Apuseni Mountains, Romania led till now to the identification of over 40 arboreal taxa, allowing a complex phytoecological, palaeoenvironmental and palaeoclimatic analysis during Late Badenian in Tălagiu island, of Paratethys realm, where the Zarand Basin evolved. The geological evolution of the Tălagiu caldera allowed best conditions to bury and preserve by silicification of the remains of the Mid-Miocene forest, which lived on the slopes of the volcano. From there, in the last years, species of the following genera were described: Tetraclinoxylon, Thujoxylon, Chamaecyparixylon, Cupressinoxylon, Taxodioxylon, Sequoioxylon, Pinuxylon, Magnolioxylon, Cinnamomoxylon, Spiroplatanoxylon, Liquidambaroxylon, Eucaryoxylon, Rhysocaryoxyton, Pterocaryoxylon, Fagoxylon, Quercoxylon, Alnoxylon, Populoxylon, Salicoxylon, Nyssoxylon, Paraphyllanthoxylon, Piranheoxylon, Aceroxylon, Fraxinoxylon and Rhizopalmoxylon, taking into account all the palaeoxylotomical identifications. That forest was a Mixed Mesophytic Forest with Lauraceae and Conifers altitudinally storeyed, and with remains of pre-Miocene sempervirent elements of paratropical or subtropical climate. Thus, the evaluated climatic parameters suggest a humid subtropical palaeoclimate toward warm-temperate of Mediterranean type (Cfa to Csa in K
ppen classification) according to the island mountainous relief, where the altitudes probably did not exceeded 1200 m.