Peter Bengtson

• Professor
• Professor (emeritus) at Heidelberg University

The break-up of Gondwana in the latest Jurassic and earliest Cretaceous and the subsequent opening and evolution of the South Atlantic Ocean as a new widening seaway linking northern and southern high latitudes, was the single most significant palaeoceanographic event during the Cretaceous with global consequences for the climate and the biotic evo...

The geoscience community has long needed national coordination of geological names in Sweden. Issues of formalization, priority, definition, and distribution of stratigraphic units and other geological features have long been matters of contention among Swedish geoscientists. Several years of discussions have led to the publication of a Swedish gui...

The influence of the Intertropical Convergence Zone (ITCZ) in the emerging South Atlantic region during the late Aptian (Early Cretaceous) is reflected in the spatio-temporal distribution of plant communities recorded in eight Brazilian sedimentary basins. The distribution of the bioclimatic groups of hygrophytes, hydrophytes, tropical lowland flor...

New, accurately located and well-preserved agnostid trilobite material has been collected from the type locality of the Drumian (middle Cambrian, Miaolingian) Manuels River Formation, Newfoundland, Canada. The well-exposed grey to black shales containing the fauna were deposited on the former microcontinent Avalonia. Four interval zones for the suc...

Although an early Cambrian origin of cephalopods has been suggested by molecular studies, no unequivocal fossil evidence has yet been presented. Septate shells collected from shallow- marine limestone of the lower Cambrian (upper Terreneuvian, c. 522 Ma) Bonavista For- mation of southeastern Newfoundland, Canada, are here interpreted as straight, e...

Fifty heterodont bivalve species, belonging to 35 genera, 15 families and six orders, from the Cenomanian–Coniacian Cotinguiba Formation of the Sergipe Basin, north-eastern Brazil, are systematically described and figured. Thirty-three species are recorded from the basin for the first time. The new species Callucina (C.) itaporangensis sp. nov. fro...

The Cretaceous is generally conceived as one of the warmest geological periods in Earth history. The link between climate and plant distribution is here highlighted on the basis of palynological analyses. An upper Aptian well section from the Sergipe Basin in northeastern Brazil documents four cycles of dry–wet oscillations, based on palynological...

Richard Reyment was born in Australia in 1926 in a family with roots in England, Ireland, Sweden and Spain. At the age of 22 he emigrated to Sweden, where he married Eva Regina, with whom he had two daughters (and two stepchildren). His career as a geologist started with 6 years at the Geological Survey of Nigeria (1950–1956), followed by a Ph.D. a...

The present special issue on Cretaceous ammonites is dedicated to the memory of Richard A. Reyment, founder of Cretaceous Research and an authority on Cretaceous ammonites, who passed away on 30 March 2016 at the age of 89. The issue contains a biography of Richard's life, from his early years in Australia, his emigration to Sweden at the age of 22...

Richard Reyment was born in Australia in 1926 in a family with roots in England, Ireland, Sweden and Spain. At the age of 22 he emigrated to Sweden, where he married Eva Regina, with whom he had two daughters (and two stepchildren). His career as a geologist started with 6 years at the Geological Survey of Nigeria (1950–1956), followed by a Ph.D. a...

The Prionocyclus germari Zone is recognized for the first time in the Vocontian Basin. The upper part of the “calcaires blancs à silex” of the western Dieulefit syncline is characterized by the zonal index and a diverse ammonite fauna, as well as inoceramids of the Mytiloides scupini Zone. The co-occurring heteromorph ammonites Hyphantoceras (Hypha...

A low-diversity ammonite fauna is described from the Qihulin Formation of the dominantly non-marine Longzhaogou Group exposed in Mishan and Hulin counties in eastern Heilongjiang, northeastern China. The fauna consists predominantly of Pseudohaploceras? cf. nipponicum Shimizu, 1931, and Pseudohaploceras? peideense (Liang, 1982), with subordinate Eo...

A biostratigraphic zonation scheme based on ammonites is presented for the Cretaceous of the Sergipe Basin in northeastern Brazil. The marine beds range from the upper Barremian to the Maastrichtian, of which the Aptian–Coniacian and Campanian successions have yielded ammonites. The historical development leading to the current ammonite zonation is...

Large-scale biogeographic provinces of Cretaceous ammonoids, as currently defined in the literature, were delimited using qualitative assessments of taxonomic inventories. Using aggregated species occurrences in the Paleobiology Database, we generated a geographic network to quantify connectivity of Albian epicontinental basins and used the flow-ba...

Spinose ammonoids occur in Earth history from the origin to the extinction of the subclass. In many cases, entire groups were concerned. The growth of spines in Kimmeridgian (Jurassic) aspidoceratids are described, discussed, and their construction and possible functions are compared with those of euomphaloceratine ammonites from the lower Turonian...

The ammonite Codazziceras ospinae (Karsten, 1858) is described from sections in the Upper Magdalena Valley and San Francisco, south and north-west of Bogotá, Colombia. Its co-occurrence with species of Hoplitoides von Koenen, 1898, and Coilopoceras Hyatt, 1903, places it stratigraphically in the lower to middle Turonian, in contrast to previous ass...

A sample of 682 suture lines belonging to 204 Cretaceous planispiral ammonoid genera shows a positive, significant relationship between suture complexity (measured as fractal dimension [Df]) and generic longevity. However, during the Cretaceous there was no increase in the mean fractal dimension. This paradox is due to the evolutionary dynamic duri...

The late Aptian (Early Cretaceous) is a crucial time interval for understanding the paleoceanographic changes in the Southern Hemisphere. Oceanographic changes in the emerging South Atlantic Ocean during this interval are reflected in the stratigraphic distribution of dinoflagellate communities recorded in the Muribeca and Riachuelo formations of t...

Agnostid trilobites of the Drumian (middle Cambrian) Manuels River Formation were studied in its type locality, a classic Cambrian outcrop in Manuels River, Newfoundland, Canada. The grey to black shales containing the fauna, were deposited on the former microcontinent Avalonia. The agnostids were determined by use of modern systematic concepts and...

The sedimentary rocks at Manuels River, a classic locality on the south coast of Conception Bay, Newfoundland, Canada, comprise a concordant succession deposited on the former microcontinent Avalonia during the Cambrian. The succession rests on magmatic rocks of Neoproterozoic age and is conformably overlain by Ordovician sedimentary rocks. The par...

Twenty-two species of the bivalve order Pholadomyida, belonging to six genera and seven subgenera of the families Pholadomyidae, Pleuromyidae and Poromyidae are described from the Cenomanian–Coniacian Cotinguiba Formation of the Sergipe Basin, north-eastern Brazil. Eleven species, Pholadomya (Ph.) cf. agrioensis Weaver, Ph. (Ph.) kasimiri Pusch, Ph...

Twenty-two species of the bivalve order Pholadomyida, belonging to six genera and seven subgenera of the families Pholadomyidae, Pleuromyidae and Poromyidae are described from the Cenomanian–Coniacian Cotinguiba Formation of the Sergipe Basin, north-eastern Brazil. Eleven species, Pholadomya (Ph.) cf. agrioensis Weaver, Ph. (Ph.) kasimiri Pusch, Ph...

The bivalve species Pinna (Pinna) cretacea (Schlotheim, 1813) is redescribed from Turonian and presumed lower Coniacian beds of the Sergipe Basin, north-eastern Brazil, with the description of the new subspecies P. (P.) cretacea brevis from the upper Turonian and/or lower Coniacian. Some of the specimens of P. (P.) cretacea show predation scars of...

The bivalve species Pinna (Pinna) cretacea (Schlotheim, 1813) is redescribed from Turonian and presumed lower Coniacian beds of the Sergipe Basin, north-eastern Brazil, with the description of the new subspecies P. (P.) cretacea brevis from the upper Turonian and/or lower Coniacian. Some of the specimens of P. (P.) cretacea show predation scars of...

ABSTRACT - Megaporomya, a new genus of the bivalve family Poromyidae (order Pholadomyida), is erected and the type species Megaporomya reymenti gen. et sp. nov. described from the upper Turonian of the Cotinguiba Formation, Sergipe Basin, north-eastern Brazil. The main morphological features of the new genus are the large to very large shell, wide...

Megaporomya, a new genus of the bivalve family Poromyidae (order Pholadomyida), is erected and the type species Megaporomya reymenti gen. et sp. nov. described from the upper Turonian of the Cotinguiba Formation, Sergipe Basin, north-eastern Brazil. The main morphological features of the new genus are the large to very large shell, wide umbonal are...

The La Tabla Formation is an important petroleum reservoir in the Upper Magdalena Valley of Colombia. It was deposited in regressive and lowstand systems tracts and comprises a succession of lower shoreface to coastal plain deposits. A section in the Talora Creek, near the village of Piedras, Department of Tolima, exposes 90 m of a progradational t...

The lingulid brachiopod Lingularia? notialis sp. nov. is described from the upper Turonian (Cretaceous) of the Sergipe Basin in northeastern Brazil. The rare but well-preserved new material shows morphological characters such as muscle scars, mantle canals and a baculate shell structure. In a preliminary note L.? notialis was referred to Lingularia...

The spinicaudatan (conchostracan) Dictyestheria, originally recovered from the Yaojia Formation, is recognized to occur also in the basal part of the overlying Nenjiang Formation. This means that the Dictyestheria elongata (=D. ovata) Zone extends from the Yaojia Formation into the upper Turonian basal part of the First Member of the Nenjiang Forma...

The diverse clam shrimp Nestoria-Keratestheria fauna is widely distributed in the Dabeigou Formation in northern Hebei and eastern Inner Mongolia of China. Its important component genus Magumbonia from the Dabeigou Formation in the Luanping Basin, northern Hebei, China, is revised on the basis of a scanning electron microscope (SEM) examination of...

A reappraisal of the “Late Cretaceous Yunguilla Formation” of the Cuenca area enables the definition of four distinct formations, correlatable with those of southwestern Ecuador. A mid- to late-Campanian marine transgression (Jadán Formation) is overlain by quartz-rich conglomerates of fan-delta to turbiditic fan environment (Quimas Formation) of l...

The Cenomanian–Santonian biostratigraphy of the James Ross Basin, north-eastern Antarctic Peninsula is in need of comprehensive revision. This is being achieved by the systematic re-investigation of a series of key reference sections on the north-west coast of James Ross Island, with the first of these being located in the vicinity of Brandy Bay. A...

Two distinctive ammonite faunas are described from the Cenomanian-Turonian boundary interval in the Sergipe Basin, Brazil. The Jardim 1 section assemblage comprises Euomphaloceras costatum Cobban, Hook & Kennedy, 1989, Burroceras transitorium Cobban, Hook & Kennedy, 1989, Pseudaspi- doceras pseudonodosoides Choffat, 1898, and Vascoceras cf. gamai C...

Study of ammonites and bivalves along selected sections on the Andean margin of northern Peru and Ecuador has made it possible to recognize correlatable marine transgressions and propose a refined stratigraphic framework for the Upper Cretaceous of the region. Six maximum flooding events are recognized: latest Turonian–early Coniacian (major event)...

As part of a study of the Cenomanian-Coniacian sedimentary succession in the Sergipe Basin in northeastern Brazil, microfacies analyses were tested for possible chronostratigraphic application. The common and widespread remains of roveacrinid echinoderms proved useful for intrabasinal biochronostratigraphy. Local dolomitization in the basin, which...

A taxonomic study was carried out on ostracodes from outcrop and core samples across the Cretaceous–Tertiary boundary in the Poty quarry, Pernambuco, northeastern Brazil. Thirty species belonging to 13 genera are described; one genus, Langiella, and eight species— Schizoptocythere potyensis, Paracosta recifeiensis, Protocosta reticulata, Protobunto...

A facies analysis of the Cenomanian–Turonian (Cretaceous) boundary beds was carried out in the Japaratuba area, Sergipe Basin, north-eastern Brazil, on the basis of seven outcrop sections. The lower part of the succession is represented by dolomitic limestones and marly limestones, whereas the upper part is dominated by chalky, nodular limestones a...

Two isolated, presumably shed, marginal tooth-crowns of the mosasaur Platecarpus sp. are described from the upper Turonian and Turonian-Coniacian (Upper Cretaceous) of the Sergipe Basin in northeastern Brazil. They represent the first record of the genus from South America, thus extending the geographic range of Platecarpus beyond Africa, Europe an...

On the basis of new collections from the Sergipe and Camamu (Bahia) basins, revision of previously described material from the Pernambuco–Paraı́ba Basin and a reassessment of previous descriptions, five species of the pectinid bivalve Neithea are described from the Cretaceous of northeastern Brazil: N. (N.) alpina (d'Orbigny, 1847) from the Albian...

Noor Farsan will always be remembered for his friendliness and cheerful demeanor as well as for his contributions to pale-ontology. His premature death from a long-standing cancer illness on 23 April 2003, at the age of 62 is not only a great personal loss to family and friends but to the world of science as well. His passing marks the end of a uni...

P. 2003. The bivalve Pinna cretacea (Schlotheim, 1813) from the Cretaceous of Brazil. Acta Palaeontologica Polonica 48 (3): 475–480. The bivalve Pinna cretacea (Schlotheim, 1813) is described from the Cenomanian–Coniacian Cotinguiba Formation of the Sergipe Basin, north−eastern Brazil, and its mode of life and palaeobiogeographic distribution discu...

The geographically widespread Upper Cretaceous bivalve genus Didymotis Gerhardt, 1897 has a short stratigraphie range, from the upper Turonian to the lowermost Coniacian. Three acme occurrences, known as Didymotis events 0, I, and II, are recognised in many parts of the world. The morphology and the characteristic ornamentation of Didymotis make it...

SAMC News 17 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 16 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

Results based on taxonomic and biostratigraphic studies of marine Cretaceous ostracods collected from the Potiguar and Sergipe basins on the northeastern continental margin of Brazil are presented. The assemblages comprise more than 100 taxa, ranging in age from late Aptian to Campanian. Many taxa show restricted vertical ranges which make them str...

Cenomanian (mid Cretaceous) oysters from the Sergipe Basin in northeastern Brazil are described, with revisions of previously described forms. Nine genera and subgenera, including eleven species, are distinguished: Rastellum diluvianum (Linné, 1767), Amphidonte (Ceratostreon) reticulata (Reuss, 1846), A. (Ceratostreon) flabellata (Goldfuss, 1833),...

SAMC News 15 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 14 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

Procedures and problems connected with biogeographical work on Cretaceous ammonites are reviewed. Ammonites display distribution patterns similar to those of most other Cretaceous marine invertebrates, although their exceptionally high dispersal potential resulted in weaker biogeographical partitioning than for many other groups. The criteria for d...

SAMC News 13 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

The “Celica–Lancones” forearc Basin of southern Ecuador and northern Peru is located between the Paleozoic Amotape–Tahuin Massif to the west and NW and the continental volcanic arc to the east and SE. The study of nine sections and exhaustive sampling of the poorly fossiliferous, mainly clastic Cretaceous deposits of this Basin allowed us to define...

The "Celica-Lancones" forearc Basin of Southern Ecuador and Northern Peru is located between the Paleozoic Amotape-Tahuin Massif to the west and NW and the continental volcanic arc to the east and SE. The study of nine sections and exhaustive sampling of the poorly fossiliferous, mainly clastic Cretaceous deposits of the Basin allowed us to define...

The Aptian–Albian sedimentary sequence of the Sergipe Basin in northeastern Brazil is currently subdivided into five ammonite assemblage zones: the Epicheloniceras–Diadochoceras–Eodou¬villei¬ceras Zone (middle–upper Aptian), the Douvilleiceras Zone (lower Albian), the Oxytropi¬doceras Zone (middle Albian), the Elobiceras Zone (upper Albian) and the...

Cleoniceras (C.) aff. tenuis Mirzoev, 1967, and Cleoniceras (C.) c f quercifolium (d 'Orbigny, 1841). This discovery improves biostratigraphic subdivision o f the lower Albian o f Sergipe and aid in correlation with the European and North Am erican standard zones. Some beds stratigraphically above the C leoniceras beds contain an exceptionally rich...

The Aptian-Albian sedimentary sequence of the Sergipe Basin in northeastern Brazil is currently subdivided in five ammonite assemblage zones: the Epicheloniceras-Diadochoceras-Eodouvilleiceras Zone (middle-upper Aptian), the Douvilleiceras Zone (lower Albian), the Oxytropidoceras Zone (middle Albian), the Elobiceras Zone (upper Albian) and the Mort...

SAMC News 12 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 11 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 10 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

The stratigraphic revision of the Cretaceous series of Northwestern Peru and Southwestern Ecuador shows that, subsequently to the Albian transgression, three distinct forearc sedimentary basins were formed. These are the turbidity-filled Lancones-Celica Basin (Late Albian to Coniacian or Santonian), the Paita-Yunguilla Basin mainly filled by shales...

SAMC News 9 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 8 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 7 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 6 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

Formal definitions of the Cenomanian-Turonian and lower–middle Turonian boundaries are proposed, following discussions at the Second International Symposium on Cretaceous Stage Boundaries, held in Brussels, 8-16 September 1995.The Global boundary Stratotype Section and Point (GSSP, "golden spike") for the Cenomanian–Turonian boundary should be plac...

SAMC News 5 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 4 (ISSN 1413-6813), newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

The eastern part of the “Celica basin” of southwesternmost Ecuador exhibits Late Cretaceous to Tertiary sediments which belong to the magmatic arc paleogeographic zone. Important N-S to NE-trending faults separate a western, mainly Late Cretaceous series (Río Playas) from an eastern succession (Catamayo-Gonzanamá) of (?) Late Cretaceous to early Te...

Following discussions at the Second International Symposium on Cretaceous Stage Boundaries, held in Brussels, 8-16 September 1995, the Working Group has identified two possible GSSP's (Global Boundary Stratotype Sections and Points) for the base of the Albian Stage. One of these, located at Vohrum (North Germany), was fully discussed at the Copenha...

D'après de nouvelles données stratigraphiques, le "bassin de Celica" s'est formé vers la limite Albien moyen-supérieur, s'est rempli de turbidites jusqu'au Coniacien (?), puis a été déformé et a émergé au cours du Sénonien. Un nouveau bassin d'avant-arc, oblique et discordant sur le "bassin de Celica" s'est ensuite formé au Campanien (moyen ?) et a...

SAMC News 1 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC).

SAMC News 1 (ISSN 1413-6813), official newsletter of IGCP Project Nº 381: South Atlantic Mesozoic Correlations (SAMC). The project newsletter will be issued regularly (every four to six months) as a forum for exchanging information and promoting the integration and collaboration among project participants. Progress reports and research results by...

Upper Aptian to Maastrichtian surface and subsurface samples from the Sergipe Basin in north-eastern Brazil yield abundant and diversified assemblages of foraminiferids, radiolarians and ostrcaods, representing environments that range from paralic (tidal flat and lagoon) to lower bathyal settings. Ammonites are abundant in the Aptian to Coniacian c...

The Cretaceous eehinoid fauna of north-eastern Brazil is revised and 39 speeies recognized; three from the broadly Albian Algodões Formation of Bahia, 13 from the Albian of the Riachuelo Formation of Sergipe, 15 from the Cenomanian–Coniacian Cotinguiba Formation of Sergipe, seven from the Turonian/Coniacian–Campanian of the Jandaíra Formation of Ri...