Benjamin Sames

Benjamin Sames
University of Vienna | UniWien · Department of Geology

Dr.

About

79
Publications
22,940
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1,093
Citations
Additional affiliations
April 2020 - February 2021
University of Vienna
Position
  • PostDoc Position
April 2015 - March 2020
University of Vienna
Position
  • Project Manager
March 2014 - February 2015
University of Vienna
Position
  • Project Collaborator
Description
  • IGCP 609 Project collaborator and secretary

Publications

Publications (79)
Article
Full-text available
Marginal-marine to non-marine ostracod assemblages from the Bajocian (Mid-Jurassic) of southern Tunisia, precisely from the Krachoua Formation at the Kef El Anneba section near the Beni Kheddache area, are here described and tested for their utility to improve the stratigraphic accuracy and palaeoenvironmental reconstructions. This particular micro...
Article
This paper presents the results of a paleoenvironmental study of two Hauterivian–Aptian adjacent sections (Transnordestina A/B) of the Iguatu Basin using ostracods and aided by X-ray fluorescence (XRF), total organic carbon (TOC), total sulfur (S), and spectral analyses. Cluster analysis divided the 10 genera found into two main groups: one compose...
Article
The objectives of this work were to establish a biostratigraphic framework for the 1-UN-24-PI well, to suggest a new biostratigraphic approach to the study of the upper Aptian, Lower Cretaceous, and also to provide new paleoecologic inferences based on ostracods for the Codó Formation in the Parnaíba Basin. The described ostracod assemblages were r...
Article
Full-text available
A diverse Eocene charophyte flora from a section at Gánt (Vértes Hills), Transdanubian Central Range, north-western Hungary, provides significant new information building on previous studies based only on sub-surface data published from the mid-twentieth century. This newly acquired material facilitates the taxonomic revision and emendation of the...
Article
Micropalaeontological investigations of the Bouhedma Formation in the Jebel Majoura section from the southern Central Tunisian Atlas revealed four successive ostracod associations (in total 16 species of 13 genera) of higher palaeoenvironmental, and thus far limited biostratigraphic and palaeobiogeographic utility due to poor preservation. The most...
Article
Full-text available
The TuronianeConiacian continental fossil record in Europe is scarce. Here we present a new fossil assemblage of early Coniacian age that was systematically collected from the coal-bearing Gosau Group of the Tiefengraben locality near St. Wolfgang, Austria. The diverse assemblage is composed of at least 60 taxa including sporomorphs and Normapolles...
Article
Full-text available
The Mesozoic era ( ∼252 to 66 million years ago) was a key interval in Earth’s evolution towards its modern state, witnessing the breakup of the supercontinent Pangaea and significant biotic innovations like the early evolution of mammals. Plate tectonic dynamics drove a fundamental climatic transition from the early Mesozoic supercontinent towards...
Article
The Turonian–Coniacian continental fossil record in Europe is scarce. Here we present a new fossil assemblage of early Coniacian age that was systematically collected from the coal-bearing Gosau Group of the Tiefengraben locality near St. Wolfgang, Austria. The diverse assemblage is composed of at least 60 taxa including sporomorphs and Normapolles...
Data
In "Investigating Mesozoic Climate Trends and Sensitivities with a Large Ensemble of Climate Model Simulations" we study global trends in the climatic evolution through the Mesozoic era (252-66 Ma). The data presented here is the model output on which the results of this manuscript are based. Also included are different different boundary condition...
Conference Paper
Full-text available
The Eocene ‘‘blue hole” freshwater limestones from the bauxite cover-sequence at the Gánt karst system (Vértes Hills), Transdanubian Central Range, north-western Hungary, have yielded rich charophyte assemblages of higher taxonomic and biostratigraphic interest. The taxonomic study of this flora allows revision and emendation of the species Raskyel...
Presentation
Full-text available
The Mesozoic era (~252—66 Ma) is traditionally considered as a prolonged greenhouse period, witnessing the breakup of the Pangaean supercontinent. Orbital cycles have, for example, been invoked as drivers of e.g. Pangaean „Megamonsoon“ variability and eustatic sea level cycles in the Mesozoic. We aim to contribute to a more comprehensive understan...
Article
The Jehol Biota of northern China provides a new and unmatched window for the reconstruction and understanding of Early Cretaceous terrestrial ecosystems. Previous studies on the paleoenvironmental and paleoclimatic background of the Jehol Biota have mainly focused on middle–late evolutionary stages while the less diverse and more narrowly distribu...
Article
Non-marine strata of Lower Cretaceous age in western Liaoning and northern Hebei, North China, are famous for its Jehol Biota, including abundant ostracods. However, there are still some controversies about the stratigraphic correlation in these regions, for instance, it is still debated whether the interval from the Liying section of Luanping Basi...
Article
Two non-marine to marginal-marine intervals have been identified by ostracod assemblages in the mid-Cretaceous carbonate platform of the Central Tunisian Atlas, the deposits of which belong to the Orbata Formation. The first non-marine interval has been recorded within member Unit 2b of the Orbata Formation which yielded the first lower Aptian ostr...
Article
Full-text available
The Upper Cretaceous Postalm section in the Northern Calcareous Alps (Austria) exposes pelagic deposits of the northwestern Tethys whose cyclostratigraphy and palaeoenvironments were examined in this study. The section displays rhythmic deposits of Santonian to late Campanian age (Gosau Group). The Santonian/Campanian transition is characterised by...
Article
Full-text available
Burmese Cretaceous amber (∼99 Ma, Myanmar) is famous for the preservation of a wide range of fauna and flora, including representatives of marine, freshwater and terrestrial groups. Here, we report on three ostracod specimens, that came visible as syninclusions to an aquatic isopod. The three specimens represent three different taxa, that were foun...
Article
Non-marine ostracods have been used for a long time to aid in the understanding of the Lower Cretaceous sedimentary deposits of Brazil, with various studies showing their value for biostratigraphic zonation in different basins. The northeastern region of Brazil contains several basins south of the Potiguar Basin which originated from the rifting th...
Presentation
Full-text available
The Mesozoic Era (~252-66 Ma) is a decisive period in Earth’s history. It is marked by a tectonic transition from the Pangea supercontinent towards a modern continental configuration as well as the ecological success of the dinosaurs and the evolution of mammals, flowering plants, stony corals and important groups of planktic calcifiers. The Mesozo...
Article
Sea-level constitutes a critical planetary boundary for both geological processes and human life. Sea-level fluctuations during major greenhouse phases are still enigmatic and widely discussed in terms of changing climate systems. The geological record of the Cretaceous greenhouse period provides a deep-time view on greenhouse-phase Earth system pr...
Article
Full-text available
Abstract The International Geoscience Programme (IGCP) Project IGCP 609 addressed correlation, causes and consequences of short-term sea-level fluctuations during the Cretaceous. Processes causing several ka to several Ma (3rd to 4th order) sea-level oscillations during the Cretaceous were so far poorly understood. IGCP 609 proved the existence of...
Article
Full-text available
A review of short-term (<3 myr: c. 100 kyr to 2.4 myr) Cretaceous sea-level fluctuations of several tens of metres indicates recent fundamental progress in understanding the underlying mechanisms for eustasy, both in timing and in correlation. Cretaceous third- and fourth-order hothouse sea-level changes, the sequence-stratigraphic framework, are l...
Presentation
Full-text available
Non-marine ostracods have been used for a long time to aid in the understanding of the Lower Cretaceous of Brazil, with various studies showing their value for biostratigraphic zonation in numerous different basins. The northeastern region of Brazil contains a number of basins located to the south of the Potiguar Basin, denominated the Northeastern...
Article
Full-text available
This paper presents breakthroughs in the chronostratigraphy of the heretofore poorly constrained Yellow Cat Member of the Cedar Mountain Formation, which is an important record of terrestrial environments, ecosystems and global change in the ancient North American Cordilleran foreland. Zircon populations from 10 stratigraphic horizons in the Yellow...
Article
The Middle Jurassic section from the Kef El Anéba in southern Tunisia, near the Beni Kheddache area, provided exceptionally species-rich charophyte assemblages that are studied here for the first time. The Krachoua Formation yielded a Bajocian assemblage composed of Porochara fusca, P. schudackii nov sp., P. kimmeridgensis, P. westerbeckensis, Auer...
Conference Paper
Full-text available
In the context of a fruitful cooperation project recently inaugurated between Tunisian (ETAP, ONM and University of Tunis El Manar) and Austrian (University of Vienna) researchers, the Mid-Cretaceous Orbata carbonate platform from the Central Tunisian Atlas has been revised from litho-biostratigraphic and tectono-sedimentary point of view. New reli...
Conference Paper
Full-text available
A detailed micropaleontological and litho-biostratigraphical study have been carried out on the Bouhedma Formation in the Jebel Majoura from southern Central Tunisian Atlas. Rich charophyte and ostracod associations discovered herein and described from taxonomic point of view, have been implicated potentially in term of biostratigraphic analysis an...
Article
Full-text available
The base of the Campanian still lacks a designated primary marker and a defined GSSP (Global Boundary Stratotype Section and Point). We present a Santonian-Campanian boundary section from the Postalm in the Northern Calcareous Alps of Austria as a possible reference section for the northwestern Tethys. Including nearby complementary Gosau Group sec...
Article
A new non-marine ostracod fauna from the Paleogene “hamadian deposits” outcropping west of Bechar (southwestern Algeria) has been recovered from lacustrine to fluvial deposits of the Oued Méridja section and fluvial deposits on the southern edge of the Hamada de Méridja section. Recently, these sections have been dated as late Thanetian – early Ypr...
Article
Full-text available
The mid-Cretaceous Burmese amber (~99 Ma, Myanmar), widely known for exquisite preservation of theropods, also yields microfossils, which can provide important contextual information on paleoenvironment and amber formation. We report the first Cretaceous ostracod in amber-the gigantic (12.9 mm) right valve of an exclusively marine group (Myodocopa:...
Conference Paper
Full-text available
High-resolution sedimentary records across the Aptian–Albian transition from the Central Tunisian Atlas (southern Tethyan margin), precisely in the Jebel Koumine locality, were investigated for their ostracods contents. Detailed taxonomic studies allows us to describe about 60 ostracods species and subspecies belonging to freshwater, brackish and m...
Article
This work provides the first detailed taxonomic study of ostracod species from the Shenjiatun section (Nenjiang Formation, Songliao Basin, northeast China). Ten species belonging to seven genera are recognized. At the species level, this ostracod fauna shows a high degree of endemicity. The ontogeny of two species is recognized in this study, and s...
Article
This review provides a synopsis of ongoing research and our understanding of the fundamentals of sea-level change today and in the geologic record, especially as illustrated by conditions and processes during the Cretaceous greenhouse climate episode. We give an overview of the state of the art of our understanding on eustatic (global) versus relat...
Article
This work provides the first detailed taxonomic study of ostracod species from the Lower Cretaceous (Aptian) marginal coastal deposits ofthe Central Tunisian Atlas, the Kebar Formation, as well as biostratigraphic, paleoecological and paleobiogeographic implications. The ostracodfauna provides new insights into the depositional environment and bios...
Article
Full-text available
This publication presents a taxonomical and stratigraphical compilation of type specimens of Silicoflagellata (Dictyochales) and Archaeomonadacea designated by Herbert Stradner, alone or with colleagues, and deposited in the Palaeontological Collection of the Geological Survey of Austria (GBA) in Vienna. A complete list of relevant publications is...
Article
Full-text available
The 1st International Symposium on Ostracoda (ISO) was held in Naples (1963). The philosophy behind this symposium and the logical outcome of what is now known as the International Research Group on Ostracoda (IRGO) is here reviewed, namely ostracodology over the last 50 years is sociologically analysed. Three different and important historic momen...
Article
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The non-marine Lower Cretaceous ostracod genus Kegelina new genus (Cypridoidea, Cyprideidae) is known from South America (Bahia state, eastern Brazil), West Africa (Gabon and 'Congo'), and North America (Montana, Idaho and Wyoming, U.S.A.). It comprises five species: Kegelina anomala (Peck, 1941) new combination, Kegelina armata (Krommelbein, 1962)...
Conference Paper
During the Early Cretaceous, notably the Barremian-Early Albian period, the Central Tunisian Atlas was one of the larger Tethyan islands in which a marginal to coastal formation has been deposited. This formation so-called “Kebar Formation” has been dated Early Albian at its type locality Jebel Kebar (Sidi Bouzid area) based on charophytes (Trabels...
Article
Full-text available
Mammalian diversity in North America shifted significantly during the Early Cretaceous, from archaic groups dominant in the well-sampled faunas of the Late Jurassic to advanced forms (including early members of modern clades) by the Albian-Cenomanian. However, the dynamics of this transition are poorly understood, since faunas of earliest Cretaceou...
Article
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For many years Eduard Suess dealt with the phenomenon of displaced shorelines and the search for explanations for their genesis and the controlling factors. In the year 1888 Suess introduced the term eustatic movements referring to the global synchroneity of marker events in marine successions of the Earth history. Since the times of Suess, rapid s...
Article
A charophyte flora from the Upper Berriasian is described from the Lakota (Black Hills, South Dakota) and Cedar Mountain formations (San Rafael Swell, Utah) of the Western Interior Basin, United States of America. Whereas the latter is dominated by monotonous assemblages of the clavatoracean Nodosoclavator bradleyi (Harris, 1939), found in temporar...
Article
Full-text available
Abstract The northern Tethyan margin is a key region for determining environmental changes associated with the collision of continental and oceanic tectonic plates and Alpine orogeny. Herein we investigated Middle to Late Eocene neritic to bathyal sediments depo- sited during an interval of unstable climatic conditions. In order to quantify paleoe...
Article
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Despite the fact that the number of publications on the morphologic terms of ostracod carapace features is impressive, definitions, use and interpretation of many terms remain inconsistent and therefore fraught with problems. A particular problem is the application of certain terms of morphologic features in different ostracod groups without the co...
Article
Full-text available
Cypridea Bosquet 1852 (Cypridoidea, Cyprideidae) is a Kimmeridgian to Lower Eocene nonmarine ostracod genus, the representatives of which are very common and stratigraphically useful in Late Tithonian to earliest Barremian "Purbeck/Wealden-like" nonmarine deposits of the world. The revision of particularly North American representatives led to prog...
Article
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The revision of Theriosynoecum Branson 1936, a common ostracod genus of Middle Jurassic to Early Cretaceous nonmarine deposits worldwide, demonstrates that its representatives-particularly the Early Cretaceous North American ones-are not as endemic as hitherto assumed. The taxonomic concept applied herein resolves many problems resulting from an ov...
Article
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The genus Praecypridea gen. nov. (Cypridoidea, Family Cyprideidae Martin, 1940) is described and thus far comprises four species: the type species Praecypridea acuticyatha (Schudack, 1998) comb. nov., Praecypridea postelongata (Oertli, 1957) comb. nov., Praecypridea suprajurassica (Mojon, Haddoumi & Charriere, 2009) comb. nov. and Praecypridea acut...
Article
The timespan represented by the hiatus between nonmarine Upper Jurassic (Early Berriasian?) and unconformably overlying Lower Cretaceous deposits throughout the North American Western Interior foreland basin has been under discussion for the entire 20th century and remains controversial to date. Ongoing research in revision of Early Cretaceous nonm...
Article
Full-text available
On several occasions at paleontology-, geology-, and stratigraphy-related meetings during the past years, I noticed that many colleagues, even micropaleontologists, are not (anymore!) aware of the fundamental application potential of pre-Quaternary, fresh- and brackish-water ostracode fossils. Ostracodes, aquatic crawling or swimming microcrustacea...
Article
Full-text available
Dinosaur remains have inspired considerable scientific interest in the Tendaguru formation of southeastern Tanzania during the 20th century; however, this formation is exceptional in many other respects. The Late Jurassic to Early Cretaceous deposits of the Tendaguru formation in the southwestern Tethys are unique because they represent a marginal...
Article
Revisitation of the famous Late Jurassic/Early Cretaceous dinosaur locality of Tendaguru by a German–Tanzanian expedition in summer 2000 resulted in a new standard section. Micropalaeontologic samples from this section yielded a marine and nonmarine, partially mixed ostracod fauna consisting of 40 taxa and some charophyte gyrogonites and utriculi....
Article
Full-text available
Within the non-marine Cretaceous formations of Mongolia ostracods are one of the most important groups in stratigraphical terms. The following new species of the superfamily Cypridoidea are described: Trapezoidella hornei n. sp. from the Shinekhudag Formation (Hauterivian-Barremian), Ilyocyprimorpha gobiensis n. sp. from the Khukhteeg Formation (Ap...
Article
Middle–Late Miocene marine incursions are known from several foreland basin systems adjacent to the Andes, likely a result of combined foreland basin loading and sea-level rising. The equivalent formation in the southern Bolivian Chaco foreland Basin is the Middle–Late Miocene (14–7 Ma) Yecua Formation. New lithological and paleontological data per...
Article
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The Late Jurassic to Early Cretaceous Tendaguru Beds (Tanzania, East Africa) have been well known for nearly a century for their diverse dinosaur assemblages. Here, we present sedimentological and palaeontological data collected by the German-Tanzanian Tendaguru Expedition 2000 in an attempt to reconstruct the palaeo-ecosystems of the Tendaguru Bed...