By Lukas Hottinger (auth.), Davide Bassi (eds.)
This publication presents a consultant evaluate of the state-of-the-art of study on Paleogene rotaliid higher foraminifera. It offers an outline of the present realizing of systematics of this crew and, particularly, of its biostratigraphic value and palaeobiogeography. The senior writer of the paintings, overdue Professor Hottinger, a number one scientist within the box, either from a scientific and utilized facet, offers during this booklet his most up-to-date advances.
The foraminiferal kinfolk Rotaliidae is a conventional team used often which performs a huge function for petroleum exploration within the biostratigraphy and palaeobiogeography of Paleogene shallow water deposits within the heart East. This e-book goals to introduce rotaliid representatives as index fossils that may be famous in random thin-sections of cemented rocks.
The ebook is generously illustrated with an remarkable measure of accuracy. the choice of taxa is specific to types having lived within the Paleocene and the Eocene, the place their biostratigraphic importance is far better than in the course of later epochs. although, a few extra rotaliid taxa, from the past due Cretaceous or that don't belong to the kinfolk Rotaliidae sensu stricto, are incorporated during this booklet to be able to show specific roots of rotaliid phylogenetic lineages within the earlier neighborhood maturation cycle or to delimit the taxon Rotaliidae with extra precision. This ebook may be regarded as a reference within the field.
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Extra resources for Paleogene larger rotaliid foraminifera from the western and central Neotethys
7 Rotalia implumis n. ; sample 95116, Dhak Pass, Salt Range, Pakistan; first beds of the Hangu Formation bearing foraminifera; Paleocene (SBZ 3). (A–C) Sections more or less perpendicular to the coiling axis. (D, F) Oblique, uncentered sections. (E, G–I) Approximately axial, centered sections. (G) Holotype; note the columellar superposition of the successive foliar walls. Abbreviations: f foramen, s septum, ilsp intraseptal interlocular space, pr proloculus, fol folia, foa foliar aperture, up umbilical plate, spc spiral canal Remarks: The columellar structure filling the umbilicus of R.
Blayensis) are described and illustrated. The subfamily Rotaliinae (superfamily Rotaliacea, family Rotaliidae Ehrenberg, 1839) is erected to accommodate the genus Rotalia and its immediate relatives Rotorbinella and Medocia. The group of taxa is defined by the absence of dorsal ornaments and of umbilical spaces subdivided by free-standing piles. The adaxial tips of the folia are imperforate and separated from the chamber wall by the foliar suture marked by notch in the sutural depression. The foliar tip fuses in the axial area of the shell.
1–12. 6, Fig. 5. Type locality and type level: Monte Gargano, Italy, samples A 4340, A 4344, collected by P. De Castro; Cuisian (SBZ 11–12) by association with alveolinids. Derivation of name: in honour of Piero De Castro (Naples) and his work on the Monte Gargano. Diagnosis: The lenticular shells are composed of five to six whorls of low-trochospiral chambers that are dorsally evolute and ventrally involute, with a wide umbilicus filled by thick foliar walls that are fused to a solid mass. 2); the ventral side however may be flatted in the center of the umbilicus.