Gregory D. Price

Gregory D. Price
University of Plymouth | UoP · School of Geography, Earth and Environmental Sciences

PhD

About

170
Publications
35,653
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5,368
Citations
Additional affiliations
February 1998 - present
University of Plymouth
Position
  • Reader in Geology

Publications

Publications (170)
Article
Full-text available
Understanding the Earth’s climate system during past periods of high atmospheric CO2 is crucial for forecasting climate change under anthropogenically-elevated CO2. The Mesozoic Era is believed to have coincided with a long-term Greenhouse climate, and many of our temperature reconstructions come from stable isotopes of marine biotic calcite, in pa...
Article
The Jenkyns Event or Toarcian Oceanic Anoxic Event (T-OAE) was an episode of severe environmental perturbations reflected in carbon isotope and other geochemical anomalies. Although well studied in the epicontinental basins in NW Europe, its effects are less understood in open marine environments. Here we present new geochemical (carbon isotope, Ca...
Article
The end-Permian mass extinction and the subsequent Early Triassic is associated with major upheavals of the carbon cycle, an interval of approximately 5 million years, which have facilitated stratigraphic correlations in the absence of stratigraphically important index fossils. The Middle Triassic, an interval of approximately 10 million years, rec...
Article
Full-text available
Surface temperature is a fundamental parameter of Earth's climate. Its evolution through time is commonly reconstructed using the oxygen isotope and the clumped isotope compositions of carbonate archives. However, reaction kinetics involved in the precipitation of carbonates can introduce inaccuracies in the derived temperatures. Here, we show that...
Article
Clumped isotope based temperature estimates from exceptionally well-preserved belemnites from Staffin Bay (Isle of Skye, Scotland) reveal that seawater temperatures throughout the Middle-Late Jurassic were significantly warmer than previously reconstructed by conventional oxygen isotope thermometry. We demonstrate here that this underestimation by...
Article
We report stable isotope ratios (δ¹³C, δ¹⁸O), minor and trace elements (Mn, Fe, Sr, Mg) together with Ca concentrations from bivalve shells and belemnites from the Middle-Upper Jurassic Sundance Seaway (western United States), we compare them with coeval open-ocean Tethyan data, and reconstruct the palaeo-circulation of seaway waters. The Sundance...
Article
Full-text available
The Northern Hemisphere dominates our knowledge of Mesozoic and Cenozoic fossilized tree resin (amber) with few findings from the high southern paleolatitudes of Southern Pangea and Southern Gondwana. Here we report new Pangean and Gondwana amber occurrences dating from ~230 to 40 Ma from Australia (Late Triassic and Paleogene of Tasmania; Late Cre...
Article
In this study, we investigated Early Cretaceous (Valanginian, ca. 135 million years ago) climate from subtropical to boreal palaeolatitudes. Combined carbonate clumped isotope and oxygen isotope data derived from sub-arctic, boreal, and sub-tropical fossil belemnite rostra (Mollusca: Cephalopoda) provide new palaeotemperature estimates as well as a...
Article
A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic–Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (δ ¹³ C org ) of 4‰ (V-PDB) and to a minimum of −30.7‰ i...
Article
Full-text available
The Christian Malford lagerstätte in the Oxford Clay Formation of Wiltshire contains exceptionally well-preserved squid-like cephalopods, including Belemnotheutis antiquus (Pearce). Some of these fossils preserve muscle tissue, contents of ink sacks and other soft parts of the squid, including arms with hooks in situ and the head area with statolit...
Article
Full-text available
In order to understand the climate dynamics of the Mesozoic greenhouse world, it is vital to determine paleotemperatures from higher latitudes. For the Jurassic and Cretaceous climate , there are significant discrepancies between different proxies and between proxy data and climate models. We determined paleotemperatures from Late Jurassic and Earl...
Article
The Early Cretaceous (145–100 Ma) was characterized by long-term greenhouse climates, with a reduced equatorial to polar temperature gradient, although an increasingly large body of evidence suggests that this period was punctuated by episodic global “cold snaps.” Understanding climate dynamics during this high-atmospheric CO2 period of Earth’s his...
Conference Paper
Full-text available
We present new seawater temperature estimates for the Callovian to Kimmerigian interval (Middle to Upper Jurassic), from clumped isotope analyses of pristinely preserved belemnites from Staffin Bay, Isle of Skye, Scotland. We compare two belemnite genera, finding that generally Pachyteuthis give warmer temperatures than Cylindroteuthis. Our clumped...
Article
In the Early Jurassic (~183 Ma ago) global warming and associated environmental changes coincided with an extinction event in the marine realm (early Toarcian extinction event). Anoxia was previously considered to have been the main cause of extinction, but extinctions also occur at localities that remained oxygenated throughout the event, suggesti...
Conference Paper
Full-text available
The data presented here provide the first high-resolution investigation of carbon isotopeanalyses and magnetic-susceptibility measurements from an expanded hemipelagic section from the Middle Atlas Basin (Morocco). The Late Pliensbachian-Early Toarcian is a pivotal time in the Mesozoic era, marked by pronounced carbon-isotope excursions, biotic cri...
Article
Full-text available
The Early Cretaceous Weissert event, characterized by a positive carbon isotope excursion and coincident with the Paraná-Etendeka volcanism, saw a biogeochemical chain of events that ultimately led to an increase in carbon burial. A conclusive link between the Paraná-Etendeka volcanism and its impact upon the environment remains, however, elusive....
Conference Paper
Full-text available
The present study reports the results of an integrated analysis of Early Toarcian deposits from the Middle and High Atlas Basins (Morocco, western Tethyan realm) (Fig. 1). The study was carried out with the aim of comparing the variations in mineralogical, geochemical (Carbon stable isotopes) and magnetic susceptibility measurements with sedimentol...
Preprint
The Late Jurassic to Early Cretaceous interval represents a time of environmental upheaval and cataclysmic events, combined with disruptions to terrestrial and marine ecosystems. Historically, the Jurassic/Cretaceous (J/K) boundary was classified as one of eight mass extinctions. However, more recent research has largely overturned this view, revea...
Article
The Late Pliensbachian–Early Toarcian is a pivotal time in the Mesozoic era, marked by pronounced carbon-isotope excursions, biotic crises and major climatic and oceanographic changes. Here we present new high-resolution carbon-isotope and magnetic-susceptibility measurements from an expanded hemipelagic Late Pliensbachian–Early Toarcian section fr...
Article
The Jurassic succession of the Wessex Basin – especially that cropping out within the Dorset and East Devon Coast World Heritage Site – contains important lagerstätten for coleoid cephalopods. The Blue Lias and Charmouth Mudstone formations of West Dorset, the Oxford Clay Formation of North Wiltshire and the Kimmeridge Clay Formation of Purbeck hav...
Article
Full-text available
A carbonate carbon isotope curve from the Aalenian–Bathonian interval is presented from the Óbánya valley, of the Mecsek Mountains, Hungary. This interval is certainly less well constrained and studied than other Jurassic time slices. The Óbánya valley lies in the eastern part of the Mecsek Mountains, between Óbánya and Kisújbánya and provides expo...
Article
Full-text available
The late Permian mass extinction was the most severe biotic crisis of the Phanerozoic, with associated environmental changes that included the expansion of hypoxic and anoxic conditions in shallow shelf settings. It has been hypothesized that wave aeration promoted oxygen transport to the seafloor providing a ‘habitable zone’ in the shallowest mari...
Article
Full-text available
Glendonites, pseudomorphs after marine sedimentary ikaite, are found throughout the Lower Cretaceous succession of Svalbard. Existing models for the ikaite-to-glendonite transformation do not explain the different petrological fabrics observed in the glendonites of Lower Cretaceous Svalbard. This study presents an improved model for the formation o...
Conference Paper
Full-text available
In order to understand the climate dynamics of the greenhouse world of the Jurassic and Cretaceous, it is important to determine higher latitude palaeotemperatures. With respect to the Jurassic and Cretaceous there are significant differences between temperature proxies (e.g. oxygen isotope palaeothermometry vs. TEX86) and between proxy data and cl...
Conference Paper
Full-text available
The Early Jurassic period was marked by extreme environmental changes, characterized by major marine biological changes and extinctions at the global scale and a pronounced negative carbon isotope shifts recorded in marine carbonates. In order to understand these palaeoenvironmental changes in the Pliensbachian– Early Toarcian, the Issouka section,...
Article
Full-text available
Cold seeps, where seepage of hydrocarbon-rich fluids occurs in the sea floor, are sites which harbor highly specialized ecosystems associated with distinctive carbonate sediments. Although their Mesozoic record is scarce and patchy, it commonly includes dimerelloid rhynchonellide brachiopods. Here we report a monospecific assemblage of Anarhynchia...
Article
Full-text available
The synthesis of the stratigraphic data collected over more than a decade in the stratotypic area has made it possible to establish a composite section of the "Aptian marls" from the Grandis ammonite Subzone to the base of the Melchioris Zone, i.e., from the Schackoina (Leupoldina) gr. cabri foraminiferal Zone to the Globigerinelloides algerianus Z...
Conference Paper
Full-text available
A multiproxy (δ18O, δ13C, magnetic susceptibility, gamma-ray spectroscopy) stratigraphy was developed from a 31.2-m-thick Upper Valanginian to lowermost Hauterivian section of the Bersek Marl Formation in Gerecse Mountains, Hungary, comprising alternating marlstone layers of varying clay and carbonate content. The aims of the study were to understa...
Article
The late Permian mass extinction event was the largest biotic crisis of the Phanerozoic and has the longest recovery interval of any extinction event. It has been hypothesised that subsequent carbon isotope perturbations during the Early Triassic are associated with biotic crises that impeded benthic recovery. We test this hypothesis by undertaking...
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the Costabella section. Lithostratigraphy after [24]. For key see S1 Fig. (TIF)
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the Rio di Pantl section. Lithostratigraphy after [24]. For key see S1 Fig. (TIF)
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the Val Averta section. Lithostratigraphy after [24]. For key see S1 Fig. (TIF)
Data
Dolomites Raw Data (Minimum number of individuals). (XLSX)
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the Tesero section. Lithostratigraphy after [24]. BF = Bellerophon Formation. OU = Ostracod Unit. B = Bulla Member. For key see S1 Fig. (TIF)
Data
Sedimentary facies and depositional environments. (PDF)
Data
Kruskal-Wallis pairwise comparisons. (XLSX)
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the Siusi section. Lithostratigraphy follows [24]. The occurrence of H. parvus (after [59]) marks the Permian/Triassic boundary. LPE = late Permian extinction. The position of the late Permian mass extinction is interpreted from the nearby Bulla section after [33]....
Data
Stratigraphic section, position of samples (arrows) and ichnofabric indices (ii) at the l’Uomo section. Lithostratigraphy after [24]. For key see S1 Fig. (TIF)
Article
The Valanginian positive carbon isotope excursion and associated environmental changes, known as the Weissert Event, is the first in the series of Cretaceous Earth system perturbations. Here, we develop a multiproxy cyclostratigraphy from a 31.2-m-thick Upper Valanginian to lowermost Hauterivian section of the Bersek Marl Formation in Gerecse Mount...
Article
Full-text available
GSSP proposal for the upper Aptian substage in the Apt Basin (Vaucluse, SE France): Synthesis of the stratigraphic data.- The synthesis of the stratigraphic data collected over more than a decade in the stratotypic area has made it possible to establish a composite section of the "Aptian marls" from the Grandis ammonite Subzone to the base of the M...
Conference Paper
The late Permian mass extinction is the most severe biotic crisis of the Phanerozoic, associated with the expansion of hypoxic and anoxic conditions in shallow shelf settings. It has been hypothesized that wave aeration provided oxygen to the sea floor, creating a ‘habitable zone’ in the shallowest environments that allowed the survival and rapid r...
Article
The data presented here provide the first high-resolution investigation of carbon isotope and geochemical analyses derived from the Pliensbachian-Toarcian boundary, of Issouka, Middle Atlas, Morocco. The isotope data recorded in micrite reveal a stepwise negative carbon isotope excursion with values dropping to − 1.8‰ within the Polymorphum Zone. T...
Article
Full-text available
The oceanic anoxic event in the Early Toarcian, often referred to as ‘Torcian Oceanic Anoxic Event’, led to widespread deposition of organic-rich black shales and geochemical anomalies in elemental distribution and multiple isotope systems in the Early Jurassic ocean. Best characterized by its hallmark carbon isotope anomaly, the event is widely re...
Article
The Early Jurassic was marked by a progressive recovery from the end-Triassic mass extinction and punctuated by recurring episodes of anoxia. These changes, associated with fluctuations in carbon isotope composition of marine carbonates, remain incompletely understood. Here we present a high-resolution carbon and oxygen isotope record for the Early...
Article
Full-text available
In the shell-rich, laminated clays of the Phaeinum Subzone (Athleta Zone, upper Callovian, Middle Jurassic) of the Peterborough Member of the Oxford Clay Formation, large numbers of statoliths and otoliths have been recovered. This apparent mass mortality is associated with the Christian Malford Lagerstätte in which there is exceptional, soft-bodie...
Poster
Abstract: During the Early Cretaceous, Spitsbergen was located at a palaeolatitude of ~60°N. Abundant fossil wood derived from conifer forests, dinosaur trackways, enigmatic deposits such as glendonites, and stable isotope data from the Early Cretaceous formations of Spitsbergen suggest that the climate at that time was much more dynamic than the t...
Article
Full-text available
The Late Jurassic to Early Cretaceous interval represents a time of environmental upheaval and cataclysmic events,combined with disruptions to terrestrial and marine ecosystems. Historically, the Jurassic/Cretaceous (J/K) boundary was classified as one of eight mass extinctions. However, more recent research has largely overturned this view, reveal...
Article
Full-text available
Significant changes in global climate and carbon cycling occurred during the Early Cretaceous. This study examines the expression of such climatic events in high-latitude Svalbard together with the stratigraphic utility of carbon-isotope stratigraphies. Isotopic analysis of fossil wood fragments (from the Rurikfjellet, Helvetiafjellet, and Caroline...
Conference Paper
Climate warming during the late Permian is associated with the most severe mass extinction event of the Phanerozoic, and the expansion of hypoxic and anoxic conditions in shallow shelf settings. It has been hypothesised that wave aeration provided an oxygenated ‘habitable zone’ in the shallowest environments that allowed some survival and a rapid r...
Conference Paper
Full-text available
Dans la partie centrale du sillon moyen atlasique, le passage Pliensbachien-Toarcien, est caractérisé par un changement brutal dans la sédimentation. Ce changement est marqué par le passage des alternances centimétriques marnes/calcaires, riches en ammonites, bélemnites et bivalves, aux dépôts monotones de marnes grises. Ces dernières renferment de...
Article
Full-text available
Climate warming during the late Permian is associated with the most severe mass extinction event of the Phanerozoic, and the expansion of hypoxic and anoxic conditions in shallow shelf settings. It has been hypothesised that wave aeration provided a 'habitable zone' in the shallowest environments that allowed the survival and rapid recovery of bent...
Article
Isotopic data (C and O) derived from Callovian (Middle Jurassic) mollusks (bivalves, ammonites and belemnoids, including true belemnites and Belemnotheutis) are presented from a narrow stratigraphic interval in the Christian Malford Lagerstätte, UK. The exceptionally well-preserved mollusks include aragonite-calcite pairs precipitated by individual...
Article
Full-text available
The occurrence of statoliths within the Jurassic succession of south-west England and other parts of Europe is reviewed. Five ‘morphospecies’ have been identified, ranging in age from Hettangian to Kimmeridgian. With so little published information on statoliths, the presently known geological record is incomplete, although new occurrences are cont...
Article
Petrological and delta C-13 analyses were undertaken on contiguous specimens of coal and intercalated minor organic-rich clastic sediments collected from coal seams spanning the Cretaceous-Paleogene boundary in the Alberta-and Saskatchewan portions of the Western Interior Basin. The generally high smectite content of the coal suggests that the orig...
Conference Paper
Full-text available
The Petrockstow and Bovey basins are two similar pull apart (strike slip) basins belonging to the Sticklepath – Lustleigh Fault Zone (SLFZ) in Devon, SW England. The SLFZ is one of the several faults on the Cornubian Peninsula and may be linked to Variscan structures rejuvenated in Palaeogene times. The bulk of the basins' fill consists of clays, s...
Conference Paper
Late Jurassic–Early Cretaceous carbon isotope stratigraphies derived from measured sections in the Bakony and the Gerecse Mts. (Hungary), constrained by ammonite, belemnite and calpionellid biostratigraphy together with magnetostratigraphy are presented. We evaluate whether a consistent pattern in carbon (and oxygen) isotope varia-tion can be estab...
Book
Full-text available
Year of publication: 2013, Hard cover, 240x328 mm size, 422 pages List price: 25 EUR This monograph summarizes our current knowledge on the richly fossiliferous Upper Jurassic–Lower Cretaceous carbonate formations of the Gerecse and Pilis Mountains, through the work of eleven authors from five countries. Studies of the macro-and microfauna from 18...