Simonetta Monechi

Simonetta Monechi
University of Florence | UNIFI · Dipartimento di Scienze della Terra

About

175
Publications
33,539
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5,957
Citations
Citations since 2016
32 Research Items
2512 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Introduction
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Publications

Publications (175)
Article
The early Eocene paleoclimate record provides one of the best analogues for today’s global warming. In order to reconstruct the evolution of the early Eocene paleoclimate, and understand how environmental feedback mechanisms acted on it, an accurate time framework is necessary. In this regard, the astronomically calibrated time scale (ATS) provides...
Article
Full-text available
We present a taxonomic revision of the family Fasciculithaceae focused on forms that characterize the early evolution of this family group, which are currently included within the genera Gomphiolithus, Diantholitha, Lithoptychius and Fasciculithus. The investigation approach is based on a combined light microscope (LM) and scanning electron microsc...
Article
During the middle Eocene to early Oligocene Earth transitioned from a greenhouse to an icehouse climate state. The interval comprises the Middle Eocene Climatic Optimum (MECO; ~40 Ma) and a subsequent long-term cooling trend that culminated in the Eocene-Oligocene transition (EOT; ~34 Ma) with the Oi-1 glaciation. Here, we present a refined calcare...
Article
Full-text available
The base of the Priabonian Stage is one of two stage boundaries in the Paleogene that remains to be formalized. The Alano section (NE Italy) was elected by consensus as a suitable candidate for the base of the Priabonian during the Priabonian Working Group meeting held in Alano di Piave in June 2012. Further detailed research on the section is now...
Article
Full-text available
The Global Stratotype Section and Point (GSSP) for the base of the Bartonian, currently remains undefined. The Bartonian unit stratotype is located at the Barton coastal section in the Hampshire Basin, on the South Coast of the UK. The base of the “Barton beds” was originally placed at the lowest occurrence of Nummulites prestwichianus, and this is...
Article
An expanded record (~14 m)of the Paleocene–Eocene Thermal Maximum (PETM), a transient period of extreme global warming that occurred ~56 million years ago, has been found based on calcareous nannofossil and foraminifera stratigraphy in the deep marine Río Gor section, Subbetic Zone, SE Spain. During the early Palaeogene the Subbetic Zone was situat...
Conference Paper
Full-text available
The last five millennia, in Europe, have been characterized by an alternation of warm and cool intervals, but the driving mechanism that leads these climatic variations is still uncertain. One of the possible causes of the European climatic variations is the influence of the North Atlantic Oscillation (NAO). The planktonic foraminiferal assemblages...
Conference Paper
Full-text available
The base of the Bartonian Stage remains undefined. The Alum Bay section (Isle of Wight) is the parastratotype section of the Bartonian unit Stratotype located in the Hamp-shire Basin. The level chosen for the base of the unit Bartonian Stage, in the type area, is a single bed rich in Nummulites prestwichianus. Unfortunately this bed is scarcely cor...
Article
Full-text available
We combine stable isotope, calcareous nannoplankton, and benthic foraminiferal records for Ocean Drilling Program Sites 1262 (paleodepth ~3,500 m) and 1263 (paleodepth ~1,500 m) on Walvis Ridge (SE Atlantic), to document the marine biotic response to Eocene Thermal Maximum 3, in the early part of the Early Eocene Climate Optimum, ~3.1 Myr after the...
Article
The GSSP for the base of the Chattian Stage (Paleogene System, Oligocene Series) is defined at meter level 197 in the Monte Cagnero section, which belongs to the pelagic succession of the Umbria-Marche basin (Urbania, central Italy: 43°38′47.81″N-12°28′03.83″E). This level with an astronomical age of 27.82 Ma coincides with the highest common occur...
Article
The Scaglia Toscana Formation (Scisti Policromi Auctt.) is one of the most investigated formations of the Tuscan Nappe. The formation is widely exposed in the Chianti Mounts and despite the number of studies in this area, some aspects remain poorly known and debated. In this paper new litho-and bio-stratigraphic data from eight key-sections distrib...
Article
The 150th anniversary of the death of Albert Oppel (1831–65) provided the opportunity to celebrate this outstanding stratigrapher with a Thematic Issue dedicated to the importance of fossils for dating and correlating of sedimentary rocks. In this issue, we analyse Oppel’s significant contribution to modern chronostratigraphy, before exploring the...
Poster
Full-text available
These results are part of a multidisciplinary study carried out by members of the International Subcommission on Paleogene Stratigraphy, which aims at describing in detail the base of the Bartonian stage for correlation with sections that have the potential to become the Global Stratotype Section and Point –GSSP- for the base of the Bartonian.
Article
High-resolution geochemical time series from the composite Contessa Road-Bottaccione (CRBTT) section (central Italy) allows testing the global significance of Early Eocene short- and long-term carbon isotope trends by comparison with available records from oceanic successions. Spectral analysis reveals Milankovitch frequency band fluctuations in th...
Article
Full-text available
Calcareous nannofossils are considered one of the most powerful biostratigraphical tool in marine carbonate sediments especially in open ocean settings. Their origination goes at least as far back as the Triassic (ca. 220 Ma) when they first biomineralized and produced calcite skeletons. Since then, they have evolved rapidly showing widespread biog...
Article
Full-text available
The transition from the Bartonian to the Priabonian, as traditionally understood, has long been associated with a series of extinctions and originations in several microfossil groups. The planktonic forami-nifer genus Morozovelloides and large species of Acarinina suffered a rapid global extinction, as did many radiolarians. Calcareous nannofossils...
Article
Full-text available
In June 2016 the Paleogene, Neogene, and Quaternary subcommissions (ISPS, SNS, SQS) of the International Commission on Stratigraphy (ICS) voted on whether to formalize sub-series and their geochronologic equivalents, sub-epochs. The vote required a 60 percent majority for the proposal to be forwarded to the ICS for further consideration. That major...
Article
Full-text available
During the late Eocene there was an enigmatic enhancement in the flux of extraterrestrial material to Earth. Evidence comes from sedimentary ³He records indicating an increased flux of interplanetary dust during ca. 2 Myr, as well as two very large impact structures, Popigai (100 km diameter) and Chesapeake Bay (40-85 km), that formed within 10-20...
Article
Full-text available
Research interest in the early Paleogene was greatly enhanced after the recognition of several short-lived warming events in that period (hyperthermals), considered ancient analogues of the ongoing warming of the Earth climate. In the Caravaca and Alamedilla sections, the previously most studied lower Paleogene sections of the Subbetic Zone (Betic...
Article
The Latest Danian Event (LDE) or Top Chron C27n hyperthermal event has been identified in the Caravaca section (Southern Spain) by means of calcareous nannofossil biozones (Subzone NTp7b) and the recognition of a prominent, negative ~. 0.6 per mille carbon isotope excursion measured in benthic foraminiferal tests. This is the first time that this D...
Chapter
Throughout most of the 19th and 20th centuries, studies of Paleogene stratigraphy carried out in the Iberian Peninsula lagged behind those of northern Europe. More recently, however, Iberian contributions on this topic have increased in both number and importance. This is highlighted by the definition of several global stratotype sections and point...
Article
Full-text available
The transition from the Bartonian to the Priabonian, as traditionally understood, has long been associated with a series of extinctions and originations in several microfossil groups. The planktonic forami- nifer genus Morozovelloides and large species of Acarinina suffered a rapid global extinction, as did many radiolarians. Calcareous nannofossil...
Conference Paper
Full-text available
Quantifying the absolute nannofossil abundances is a very useful and powerful tool to investigate calcareous nannoplankton accumulation rates in marine sediments and compare datasets from different time intervals and paleogeographic areas. The easiest way of calculating the absolute abundance is to count the number of specimens per field of view, o...
Conference Paper
Full-text available
High-resolution analysis was carried out on a about 30 m Early Eocene interval of pelagic marl and limestones succession at Sopelana (Basque-Cantabrian Basin, western Pyrenees). The aim of the study was to characterize the orbitally controlled sedimentary cyclicity. To this end a high-resolution (1 sample/1000-1500 years) analysis of CaCO3 was carr...
Article
Full-text available
The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene– Oligocene transition was investigated at a high resolution at Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, southeast Atlantic Ocean) and compared with a lowerresolution benthic foraminiferal record. During this time interval, global cli...
Article
Full-text available
The Upper Cretaceous to Paleocene succession cropping out at the Bottaccione section (Gubbio, central Italy) represents a classical Tethyan setting that served as a standard for the construction of the geomagnetic polarity time scale. Available biomagnetostratigraphy suggests that the Danian interval of the Bottaccione section is condensed relative...
Article
Full-text available
The onset of Earth's present icehouse climate in the Late Eocene coincides with astronomical events of enigmatic causation. At ∼36 Ma ago the 90–100 km large Popigai and Chesapeake Bay impact structures formed within . Enrichments of 3He in coeval sediments also indicate high fluxes of interplanetary dust to Earth for . Additionally, several medium...
Article
Full-text available
The biotic response of calcareous nannoplankton to environmental and climatic changes during the Eocene–Oligocene transition (~34.8–32.7 Ma) was investigated at high resolution at Ocean Drilling Program (ODP) Site 1263 (Walvis Ridge, South East Atlantic Ocean), and compared with a lower resolution benthic foraminiferal record. During this time inte...
Conference Paper
Full-text available
During the Eocene-Oligocene transition (EOT), the world changed from a high-pCO 2 warm Eocene world to a cool, lower pCO 2 Oligocene world, oceanic phytoplankton was affected in various ways (Persico & Villa, 2004; Dunkley Jones et al., 2008; Henderiks & Pagani, 2008). To unravel the relations between changes in climatic and calcareous nannofossil...
Chapter
Full-text available
The Global Stratotype Section and Point (GSSP) for the base of the Bartonian (middle Eocene) stage is as yet undefined. Herein the potential of the La Acebosa Formation exposed on the eastern side of the Cape of Oyambre (San Vicente de la Barquera, province of Cantabria, N Spain) is analysed. Sedimentological and benthic foraminiferal data indicate...
Chapter
Full-text available
The Global Stratotype Section and Point (GSSP) for the base of the Bartonian (middle Eocene) stage is as yet undefined. Herein the potential of the successions found in the Basque-Cantabrian and Aquitanian basins (western Pyrenees) is analysed. On the basis of the available data, no outcrop in the Biarritz and Pamplona areas fulfilled the requireme...
Chapter
Full-text available
The deep-water hemipelagic Alano section is located in the Southern Alps of northern–eastern Italy close to the village of Alano di Piave in the type area of the Priabonian. Since 2005, the section has been presented as the potential Global Boundary Stratotype Section and Point (GSSP) for the late Eocene Priabonian Stage at several meetings of the...
Article
The analyses of coccoliths and dinocysts from the IMAGES core MD95-2033, collected on the Laurentian Fan (44°39.87N, 55°37.21W; water depth = 1412 m) in the northwest North Atlantic provide a new dataset to assess the magnitude of climatic changes during the Holocene with a millennial time resolution. Coccolith and dinocyst data were combined to re...
Article
This paper presents a detailed calcareous nannofossil biostratigraphy of the entire Lutetian of the Agost section (Betic Cordillera, SE Spain). This investigation integrates and improves on previous study performed through the Ypresian/Lutetian boundary by the authors on this succession. The new revision of the integrated bio-magnetobiochronology o...
Article
A high-resolution calcareous nannofossil analysis of the Danian/Selandian boundary was conducted at Site 1262 (Walvis Ridge, South Atlantic) to pinpoint the lowest occurrence of fasciculiths and to unravel the evolutionary trends throughout nannofossil Zone NP4. Using quantitative analyses, numerous primary and secondary bioevents were identified,...
Data
A high-resolution calcareous nannofossil analysis of the Danian/Selandian boundary was conducted at Site 1262 (Walvis Ridge, South Atlantic) to pinpoint the lowest occurrence of fasciculiths and to unravel the evolutionary trends throughout nannofossil Zone NP4. Using quantitative analyses, numerous primary and secondary bioevents were identified,...
Article
The fossil bones, associated carbonate cements and enclosing concretion of a Miocene mysticete from inner shelf deposits (Monte Vallassa Formation, northern Italy) were analyzed for evidence of microbial activity. Optical and scanning electron microscopy, Raman spectroscopy, and stable C and O isotope geochemistry were used for high spatial resolut...
Article
Taxonomic remarks and comments on the early Paleocene fasciculiths are presented. The study was carried out across the Danian Selandian transition at Site 1262 (South Atlantic), Zumaia (Spain) and Qreiya (Egypt) sections. A scheme of the main characteristics and structural features useful to identify the new taxa of Gomphiolithus, Diantholitha, Lit...
Article
Full-text available
The global stratotype sections and points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages have been defined in the coastal cliff along the Itzurun Beach at the town of Zumaia in the Basque Country, northern Spain. In the hemipelagic section exposed at Zumaia the base of the Selandian Stage has been placed at...
Article
The UK37′ index has proven to be a robust proxy to estimate past sea surface temperatures (SSTs) over a range of time scales, but like any other proxy, it has uncertainties. For instance, in reconstructions of the Last Glacial Maximum (LGM) in the northern North Atlantic, UK37′ indicates higher temperatures than those derived from foraminiferal pro...
Article
Full-text available
The GSSP for the base of the Lutetian Stage (early/ middle Eocene boundary) is defined at 167.85 metres in the Gorrondatxe sea-cliff section (NW of Bilbao city, Basque Country, northern Spain; 43º22'46.47" N, 3º 00' 51.61" W). This dark marly level coincides with the lowest occurrence of the calcareous nannofossil Blackites inflatus (CP12a/b bounda...
Article
Full-text available
The GSSP for the base of the Lutetian Stage (early/middle Eocene boundary) is defined at 167.85 metres in the Gorrondatxe sea-cliff section (NW of Bilbao city, Basque Country, northern Spain; 43°22'46.47"N, 3°00'51.61" W). This dark marly level coincides with the lowest occurrence of the calcareous nannofossil Blackites inflatus (CP12a/b boundary),...
Data
The UK37' index has proven to be a robust proxy to estimate past sea surface temperatures (SSTs) over a range of time scales, but like any other proxy, it has uncertainties. For instance, in reconstructions of the Last Glacial Maximum (LGM) in the northern North Atlantic, UK37' indicates higher temperatures than those derived from foraminiferal pro...
Article
The transition from Lower Eocene to Middle Eocene (Ypresian/Lutetian) has been known as one of the four most important intervals where sharp climatic deteriorations took place during the Cenozoic (Miller et al., 1987; Miller, 1992). The Y/L transition, with its sudden upturn in delta18O values, represents the start of a phase of increasing oxygen i...
Article
In this paper we present the effects of different tracemakers on the redistribution of calcareous nannofossils throughout the K-Pg boundary at the Bidart section (SW France), along with their consequences for our knowledge of the K-Pg boundary event. Danian calcareous nannofossil assemblages are present in Maastrichtian samples due to infiltration...
Article
The calcareous nannofossil assemblages from sediment core DS97-2P from the Reykjanes Ridge have been investigated to document oceanographic changes in surface water during the Holocene. The recorded variations in coccolithophore species assemblages and accumulation rates indicate that the region was subjected to rapid changes of surface water masse...
Article
High-resolution geochemical analyses of the Lower Eocene Contessa Road section (Italy) reveal orbitally controlled fluctuations in the percent concentration of calcium carbonate (wt.% CaCO3) that include the ETM2 (Elmo) and ETM3 (“X”) hyperthermal events. Patterns of increased dissolution, negative carbon isotope excursions, and warmer global clima...
Data
The calcareous nannofossil assemblages from sediment core DS97-2P from the Reykjanes Ridge have been investigated to document oceanographic changes in surface water during the Holocene. The recorded variations in coccolithophore species assemblages and accumulation rates indicate that the region was subjected to rapid changes of surface water masse...
Article
Full-text available
The hypothesis that sunken carcasses of Mesozoic marine reptiles and Cenozoic whales acted as evolutionary stepping stones to deep-sea reducing habitats is underlain by the question of whether vent-like, chemosymbiotic specialization first evolved at shelf depths. Fossil skeletons of large whales have long been known from ancient shallow-water stra...