James S Eldrett

James S Eldrett
Shell Global | Shell · Applied Stratigraphy Team

PhD

About

100
Publications
27,317
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2,131
Citations
Citations since 2017
59 Research Items
1193 Citations
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Introduction
Research into reconstructing Cenozoic-Mesozoic-Paleozoic climate and biological response using multi-proxy approach with precise age models. Holocene oceanographic and climate conditions from geotechnical surveys including sediment samples and piston cores. Integrate biostratigraphy, geochronology, astrochronology, chemostratigraphic and isotopic studies for quantitative stratigraphy
Additional affiliations
April 2011 - May 2016
Shell Oil USA
Position
  • Snr Stratigrapher

Publications

Publications (100)
Article
A refined dinoflagellate cyst biostratigraphy has been developed for the Oligocene successions from two high latitude Northern Hemisphere sites from the Norwegian-Greenland Sea (i.e., Ocean Drilling Program Leg 162, Hole 985A and Leg 151, Hole 908A), and this has been calibrated to newly developed magnetic polarity stratigraphies for both sites. Th...
Article
A highly resolved record of stable carbon isotope values (δ13C) of the Late Cretaceous to Palaeogene (Cenomanian – Danian) was generated from ditch-cuttings material recovered from the Shearwater A9 hydrocarbon production well, Shearwater Field, Central North Sea. The profile of δ13C values was integrated with calcareous nannofossil and foraminifer...
Article
Full-text available
Centennial- to millennial-scale climate variations are often attributed to solar forcing or internal climate system variability, but recognition of such variations in the deep-time paleoclimate record is extremely rare. We present an exceptionally well-preserved, millimeter-scale laminated marlstone from a succession of precession-driven limestone-...
Article
The Middle–Late Jurassic opening of the central Atlantic and proto-Caribbean seaways connecting the Pacific with the Tethys Ocean combined with rising sea level led to a major oceanographic and climatic reorganization conducive to the development of widespread carbonate platforms and diverse reefs. The timing of this shift in carbonate production a...
Article
Early Cretaceous rift basins of the incipient South Atlantic have been the focus of intense hydrocarbon exploration and production activities and host some large oil accumulations in sections predating an interval of major salt deposition, particularly in the central segment of the South Atlantic. Understanding the timing (and associated uncertaint...
Article
Full-text available
https://doi.org/10.7185/geochemlet.2231 The emplacement of a Large Igneous Province (LIP) is implicated in the triggering of the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE 2). Evidence for a similar initiation mechanism for the mid-Cenomanian Event (MCE) is unclear. In this study, a reconstruction of mid-Cenomanian seawater 187 Os/ 188 Os, the...
Article
Chromium is a redox sensitive element that exhibits a large range of isotopic compositions in Earth’s surface environments because of Cr(VI)-Cr(III) transformations. This property of Cr has been exploited as a tracer of Earth’s oxygenation history using marine sediments. However, paleoredox applications using Cr are difficult to implement due to it...
Article
A stable carbon isotope (δ¹³C) profile of the Early Cretaceous to Paleogene (Berriasian – Danian) was generated from ditch-cuttings material recovered from well 30/2a-7, Central North Sea. The profile of δ¹³C values was integrated with calcareous nannofossil biostratigraphy and sequence stratigraphy from the Cromer Knoll Group to provide an integra...
Article
https://www.researchgate.net/publication/356109713_Centennial_to_millennial_variability_of_greenhouse_climate_across_the_mid-Cenomanian_event-Supplemental_Materials
Article
Organic palynological content in rocks, which commonly occurs in aquatic and terrestrial sediments, is essential for sediment dating, palaeoenvironmental reconstructions and determination of hydrocarbon potential. Unfortunately, the palynological signal may be blurred or even completely destroyed by intra- and post-depositional diagenetic processes...
Article
Ocean anoxic events (OAE) are characterized by increased organic content of marine sediment on a global scale with accompanying positive excursions in sedimentary organic and inorganic δ¹³C values. To sustain the increased C exports and burial required to explain the C isotope excursion, increased supplies of nutrients to the oceans are often invok...
Article
Full-text available
Several studies indicate that North Atlantic Deep Water (NADW) formation might have initiated during the globally warm Eocene (56–34 million years ago; Ma). However, constraints on Eocene surface ocean conditions in source regions presently conducive to deep‐water formation are sparse. Here we test whether ocean conditions of the middle Eocene Labr...
Chapter
Full-text available
This chapter summarizes geochronologic and other data for major Phanerozoic Large Igneous Provinces (LIPs), Oceanic Anoxic Events (OAEs) and organic-rich petroleum source rocks. It also evaluates the models that support or refute genetic links between the three groups. The evidence appears to favor genetic links between the three groups, however, a...
Article
Full-text available
The lowermost 1.45 m of the Welton Chalk Formation, including the regional sedimentary record of Oceanic Anoxic Event 2 (OAE-2), has been sampled at Melton Ross Quarry in eastern England, U.K. The section is investigated for organic geochemistry and stable isotopes for the first time, while a detailed palynological study follows previously publishe...
Article
Oceanic anoxic Event 2 (OAE-2) occurred at the Cenomanian-Turonian boundary (∼94.1 Ma) and was a time of profound global changes in ocean chemistry and the carbon cycle. This event was characterized by a positive carbon isotope excursion (CIE) caused by massive organic carbon burial, global greenhouse temperatures, ocean deoxygenation, and changes...
Article
Sedimentary couplets that are generated by astronomical forcing are common in pelagic and hemipelagic depositional settings. This study disentangles the time scales (sedimentation rates) of the two lithofacies that contribute to such astronomically-forced couplets, by introducing the Alpha method. This new method can be applied to precession or obl...
Article
The isotopic composition of Cd buried in marine sediments may preserve valuable palaeoenvironmental information on past ocean redox conditions or biological cycling. It is unclear, however, how the Cd-isotope composition of the sedimentary record reflects these processes. In this study, new Cd-isotope data are presented, along with δ¹³C, and Cd, Mo...
Article
The deep-water Léopard gas discovery in offshore Gabon presents an opportunity to examine distal facies of the Albian Madiela and Cap Lopez Groups, which overlie the Aptian Ezanga Salt. In proximal settings, the Madiela (Azingo Formation) consists of shallow marine limestone and has sparse foraminiferal recovery. In contrast, planktonic foraminifer...
Data
A dinoflagellate cyst zonation of the Cenomanian and Turonian (Upper Cretaceous) in the Western Interior, United States. To be published in the journal Palynology (ISSN 1558-9188). Pre-typeset, accepted version of manuscript (2018-05-16). Open Access, Creative Commons Attribution License (CC BY).
Article
This paper documents a previously undescribed marine palynomorph, Doricodinium obscurum gen. et sp. nov., from Upper Cretaceous sections in the central and southern Western Interior of the USA. Although an archaeopyle has not been confirmed, a case is made here for a probable dinoflagellate cyst, possible peridinioid affinity. The type locality of...
Article
Full-text available
This study documents the detailed palynology of the Bridge Creek Member, Greenhorn Limestone Formation, at the Rock Canyon anticline outcrop, west of Pueblo, Colorado, USA. The section is the formally ratified Global boundary Stratotype Section and Point (GSSP) for the base of Turonian Stage and corresponding Lower Turonian Substage, and the only p...
Article
Full-text available
Since the beginning of the century, several authors have hypothesized and documented the presence of bottom currents during the deposition of mudstones, including mudstones rich in organic matter, challenging the assumption that persistent low-energy conditions are necessary prerequisites for deposition of such sediments. More processes responsible...
Article
Oceanic Anoxic Event 2 (OAE 2), during the Cenomanian–Turonian transition (∼94 Ma), was the largest perturbation of the global carbon cycle in the mid-Cretaceous and can be recognized by a positive carbon-isotope excursion in sedimentary strata. Although OAE 2 has been linked to large-scale volcanism, several large igneous provinces (LIPs) were act...
Article
Full-text available
The Late Cretaceous Epoch was characterized by major global perturbations in the carbon cycle, the most prominent occurring near the Cenomanian–Turonian (CT) transition marked by Oceanic Anoxic Event 2 (OAE-2) at 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of several epicontinental seas in which a complex water-mass evolutio...
Article
Full-text available
The Late Cretaceous Epoch was characterized major global perturbations in the carbon cycle, the most prominent occurring near the Cenomanian-Turonian (CT) transition marked by Oceanic Anoxic Event/OAE-2 at 94.9–93.7 Ma. The Cretaceous Western Interior Seaway (KWIS) was one of several epicontinental seas in which a complex water-mass evolution was r...
Presentation
The Mid Cenomanian Event (MCE) is one of several extreme Cretaceous climatic events, which are generally characterized by extended anoxic conditions through the water column and/or at the sediment-water interface. Whilst in-depth studies of the MCE are in their relative infancy, the event is considered a major turning point within the mid-Cenomania...
Article
The taxonomic revision of the dinoflagellate cyst subfamily Wetzelielloideae by Williams et al. (2015) places primary emphasis on the type of archaeopyle, and secondarily on wall ornamentation. Williams et al. (2015) argue that the emphasis placed on the archaeopyle type as taxonomic criterion provides much more clarity for taxonomic differentiatio...
Article
Full-text available
Oceanic Anoxic Event 2 (OAE2), a ∼ 600 kyr episode close to the Cenomanian–Turonian boundary (ca. 94 Ma), is characterized by relatively widespread marine anoxia and ranks amongst the warmest intervals of the Phanerozoic. The early stages of OAE2 are, however, marked by an episode of widespread transient cooling and bottom water oxygenation: the Pl...
Article
Full-text available
Oceanic Anoxic Event 2 (OAE2), a ~600 kyr episode close to the Cenomanian-Turonian boundary (ca. 94 Ma), is characterized by widespread marine anoxia and ranks amongst the warmest intervals of the Phanerozoic. The early stages of OAE2 are, however, marked by an episode of widespread transient cooling and bottom water oxygenation: the Plenus Cold Ev...
Poster
Full-text available
The Boquillas Formation (Fm.) (equivalent to the Eagle Ford Group) was deposited at the Southern end of the Cretaceous Western Interior Seaway (KWIS) and the northwestern margin of the Gulf of Mexico Carbonate Shelf (passive margin) in a starved retroarc foreland basin setting during part of the Cenomanian and Turonian Stages (CT; 97-90 Ma). The Bo...
Data
Grayscale data captured from high resolution core images @250 micron resolution for the Austin Chalk, Eagle Ford and upper Buda Limestone from the Iona-1 core.
Conference Paper
Full-text available
The Paleocene to Eocene Sele Formation is developed in the basinal region of the Central North Sea and consists of four deep-sea fan complexes; the Forties, Bittern, Cromarty, and Gannet fans. The Forties Fan is the most extensive, and is characterized as a mixed mud-sand, rampsourced system. The proximal part of the fan comprises channel complexes...
Article
Full-text available
The Paleocene–Eocene-aged Sele Formation is developed across the basinal region of the Central North Sea. The section comprises a number of deep-marine fan systems that expanded and contracted across the basin floor in response to relative sea-level changes on the basin margin and fluctuating sediment yield off the Scottish landmass modulated by cl...
Poster
Full-text available
The Cenomanian to Turonian (C-T) Boundary transition (95-93 Ma) represents one of the most profound global perturbations in the carbon cycle of the last 140 Ma during a Greenhouse climate interval, named oceanic anoxic event #2 (OAE2). OAE2 is defined by a globally recognised positive carbon isotope excursion (CIE), indicating the widespread remova...
Article
Full-text available
The Cenomanian to Turonian boundary transition (ca. 95–93 Ma) represents one of the most profound global perturbations in the carbon cycle of the past 140 m.y. This interval is characterized by widespread deposition of organic-rich fine-grained sediment marked by a globally recognized positive carbon isotope excursion (CIE) reflecting the widesprea...
Article
Full-text available
The Paleocene–Eocene Thermal Maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean–atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean w...
Article
Full-text available
The Paleocene-Eocene thermal maximum (PETM) represents a ~170 kyr episode of anomalous global warmth ~56 Ma ago. The PETM is associated with rapid and massive injections of 13C-depleted carbon into the ocean-atmosphere system reflected as a prominent negative carbon isotope excursion (CIE) in sedimentary components. Earth's surface and deep ocean w...
Article
Lower Eocene to Oligocene microfossil-rich hemipelagic sediments in ODP Hole 647A, southern Labrador Sea, provide a strategic section for resolving the early history of high North Atlantic climates and ocean circulation, and for correlating with carbonate-poor lower Cenozoic sediments in the Arctic and Nordic seas. Our new, integrated palaeomagneto...
Poster
Full-text available
The Paleocene-Eocene thermal maximum (PETM) represents a ~170kyr episode of anomalous global warmth ~55.8 Myr ago, with the onset being marked by a geologically abrupt negative carbon isotope excursion (CIE) in both marine and continental sedimentary components. Reflecting the massive release of 13C-depleted carbon into the ocean and atmospheric sy...
Conference Paper
Full-text available
Increasingly high resolution isotope- and novel organic geochemical proxy records have revealed that the long-term cooling trend of the middle Eocene was interrupted by a warming phase designated the Middle Eocene Climatic Optimum (MECO). It is suggested to represent an increase in sea surface temperatures of about 4°C, lasting approximately 400 k...
Article
Full-text available
Ocean Drilling Program (ODP) Hole 647A in the southern Labrador Sea (~53° N) is the highest latitude Eocene to Oligocene cored sediment sequence with abundant carbonate that overlies oceanic crust. New paleomagnetic and palynologic stratigraphy of this site is tied to the higher latitude magneto-biostratigraphy of Eldrett et al., (2004) for the car...
Article
Against the background of the profound global climatic shift from greenhouse to icehouse conditions during the Eocene–Oligocene transition, major geographic and oceanographic changes were taking place in the Norwegian–Greenland Sea region. The Vøring Plateau was a prominent structural feature which influenced the evolution of water mass circulation...
Article
Full-text available
A profound global climate shift took place at the Eocene-Oligocene transition ( approximately 33.5 million years ago) when Cretaceous/early Palaeogene greenhouse conditions gave way to icehouse conditions. During this interval, changes in the Earth's orbit and a long-term drop in atmospheric carbon dioxide concentrations resulted in both the growth...