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Professor Darren Grocke's Outputs (152)

Stable-isotope record of the Eifelian–Givetian boundary Kačák–otomari Event (Middle Devonian) from Hungry Hollow, Ontario, Canada (2008)
Journal Article
van Hengstum, P., & Gröcke, D. (2008). Stable-isotope record of the Eifelian–Givetian boundary Kačák–otomari Event (Middle Devonian) from Hungry Hollow, Ontario, Canada. Canadian Journal of Earth Sciences, 45(3), 353-366. https://doi.org/10.1139/e08-005

The Kačák Event in the Middle Devonian (Eifelian–Givetian (E–G) boundary) is a period of apparent global anoxia coincident with widespread deposition of black shale in hemipelagic, pelagic, and some neritic facies. Conodont biostratigraphy in the Nor... Read More about Stable-isotope record of the Eifelian–Givetian boundary Kačák–otomari Event (Middle Devonian) from Hungry Hollow, Ontario, Canada.

A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies (2008)
Journal Article
Kingston, A., Gröcke, D., & Burchell, M. (2008). A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies. Geochemistry, Geophysics, Geosystems, 9(1), Article Q01007. https://doi.org/10.1029/2007gc001807

Stable-isotope ratios of two modern Saxidomus gigantea specimens from Namu, British Columbia, are presented to show intraspecimen and interspecimen isotopic variation. Isotopic profiles (δ 13Cshell, δ 18Oshell) were generated along the axis of maximu... Read More about A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies.

Exceptionally preserved Late Albian (Cretaceous) Arcellaceans (Thecamoebians) from the Dakota Formation near Lincoln, Nebraska, USA (2007)
Journal Article
van Hengstum, P., Reinhardt, E., Medioli, F., & Gröcke, D. (2007). Exceptionally preserved Late Albian (Cretaceous) Arcellaceans (Thecamoebians) from the Dakota Formation near Lincoln, Nebraska, USA. Journal of foraminiferal research, 37(4), 300-308. https://doi.org/10.2113/gsjfr.37.4.300

Thousands of exceptionally well-preserved Arcellaceans (Thecamoebians) have been recovered from a Late Albian (Cretaceous) deposit. Sedimentary samples were obtained from a clayey-silt leaf bed in the Dakota Formation, outcropping in a clay pit excav... Read More about Exceptionally preserved Late Albian (Cretaceous) Arcellaceans (Thecamoebians) from the Dakota Formation near Lincoln, Nebraska, USA.

Reply to the comment on “Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve” by John M. McArthur and Paul B. Wignall (2007)
Journal Article
Gröcke, D., & Waltham, D. (2007). Reply to the comment on “Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve” by John M. McArthur and Paul B. Wignall. Geochimica et Cosmochimica Acta, 71(13), 3387 -3387. https://doi.org/10.1016/j.gca.2007.04.016

Waltham and Gröcke (2006) introduced a new methodology for analysis of the seawater strontium-isotope curve, which showed that changes to a source-flux (e.g., the continental weathering flux) or a source-isotope ratio (e.g., the hydrothermal flux iso... Read More about Reply to the comment on “Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve” by John M. McArthur and Paul B. Wignall.

A preliminary analysis of the DNA and diet of the extinct Beothuk: A systematic approach to ancient human DNA (2007)
Journal Article
Kuch, M., Gröcke, D., Knyf, M., Thomas, M., Gilbert, P., Younghusband, B., …Poinar, H. (2007). A preliminary analysis of the DNA and diet of the extinct Beothuk: A systematic approach to ancient human DNA. American journal of physical anthropology, 132(4), 594-604. https://doi.org/10.1002/ajpa.20536

We have used a systematic protocol for extracting, quantitating, sexing and validating ancient human mitochondrial and nuclear DNA of one male and one female Beothuk, a Native American population from Newfoundland, which became extinct 180 years ago.... Read More about A preliminary analysis of the DNA and diet of the extinct Beothuk: A systematic approach to ancient human DNA.

Atypical diagenetic effects on strontium-isotope composition of Early Jurassic belemnites, Queen Charlotte Islands, British Columbia, Canada (2007)
Journal Article
Gröcke, D., Hesselbo, S., & Findlay, D. (2007). Atypical diagenetic effects on strontium-isotope composition of Early Jurassic belemnites, Queen Charlotte Islands, British Columbia, Canada. Canadian Journal of Earth Sciences, 44(2), 181-197. https://doi.org/10.1139/e06-087

In this study, strontium-, carbon- and oxygen-isotope data are reported from Early Jurassic belemnites from Yakoun River, Queen Charlotte Islands (QCI), British Columbia. Assuming that the established ammonite correlations between Canada and Europe a... Read More about Atypical diagenetic effects on strontium-isotope composition of Early Jurassic belemnites, Queen Charlotte Islands, British Columbia, Canada.

Stable hydrogen-isotope ratios in beetle chitin: preliminary European data and re-interpretation of North American data (2006)
Journal Article
Gröcke, D., Schimmelmann, A., Elias, S., & Miller, R. (2006). Stable hydrogen-isotope ratios in beetle chitin: preliminary European data and re-interpretation of North American data. Quaternary Science Reviews, 25(15-16), 1850-1864. https://doi.org/10.1016/j.quascirev.2006.01.021

Beetle exoskeletons contain chitin, a poly amino-sugar that is biosynthesized incorporating hydrogen isotopes from diet and water. As the stable isotope ratios D/H (or 2H/1H, expressed as δD values) of precipitation and diet are jointly influenced by... Read More about Stable hydrogen-isotope ratios in beetle chitin: preliminary European data and re-interpretation of North American data.

Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA. (2006)
Journal Article
Gröcke, D., Ludvigson, G., Witzke, B., Robinson, S., Joeckel, R., Ufnar, D., & Ravn, R. (2006). Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA. Geology, 34(3), 193-196. https://doi.org/10.1130/g21998.1

Analysis of bulk sedimentary organic matter and charcoal from an Albian-Cenomanian fluvial-estuarine succession (Dakota Formation) at Rose Creek Pit (RCP), Nebraska, reveals a negative excursion of ∼3‰ in late Albian strata. Overlying Cenomanian stra... Read More about Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA..

Facies analysis and correlation of high-order sequences in middle-outer ramp successions: variations in exported carbonate on basin-wide δ13Ccarb (Kimmeridgian, NE Spain) (2005)
Journal Article
Bádenas, B., Aurell, M., & Gröcke, D. (2005). Facies analysis and correlation of high-order sequences in middle-outer ramp successions: variations in exported carbonate on basin-wide δ13Ccarb (Kimmeridgian, NE Spain). Sedimentology, 52(6), 1253-1275. https://doi.org/10.1111/j.1365-3091.2005.00740.x

Carbonate mud that accumulated in the deep parts of a late Kimmeridgian carbonate ramp (Iberian Basin, NE Spain) was partly derived by resedimentation from shallow water production areas. High-frequency sea-level changes, probably driven by climatic... Read More about Facies analysis and correlation of high-order sequences in middle-outer ramp successions: variations in exported carbonate on basin-wide δ13Ccarb (Kimmeridgian, NE Spain).

The Upper Valanginian (Early Cretaceous) positive carbon-isotope event recorded in terrestrial plants (2005)
Journal Article
Gröcke, D., Price, G., Robinson, S., Baraboshkin, E., Mutterlose, J., & Ruffell, A. (2005). The Upper Valanginian (Early Cretaceous) positive carbon-isotope event recorded in terrestrial plants. Earth and Planetary Science Letters, 240(2), 495-509. https://doi.org/10.1016/j.epsl.2005.09.001

Our understanding of the ancient ocean-atmosphere system has focused on oceanic proxies. However, the study of terrestrial proxies is equally necessary to constrain our understanding of ancient climates and linkages between the terrestrial and oceani... Read More about The Upper Valanginian (Early Cretaceous) positive carbon-isotope event recorded in terrestrial plants.

Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve (2005)
Journal Article
Waltham, D., & Gröcke, D. (2006). Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve. Geochimica et Cosmochimica Acta, 70(2), 384-394. https://doi.org/10.1016/j.gca.2005.09.014

Variations in the seawater 87Sr/86Sr curve through time can be caused by fluctuations in the strontium flux or variations in the isotopic ratio from at least six different sources and sinks. Thus, 12 or more parameters control each single measurement... Read More about Non-uniqueness and interpretation of the seawater 87Sr/86Sr curve.

Nitrogen and carbon partitioning in diagenetic and hydrothermal minerals from Paleozoic Black Shales, (Selwyn Basin, Yukon Territories, Canada) (2005)
Journal Article
Orberger, B., Gallien, J., Pinti, D., Fialin, M., Daudin, L., Gröcke, D., & Pasava, J. (2005). Nitrogen and carbon partitioning in diagenetic and hydrothermal minerals from Paleozoic Black Shales, (Selwyn Basin, Yukon Territories, Canada). Chemical Geology, 218(3-4), 249-264. https://doi.org/10.1016/j.chemgeo.2005.01.012

Selected mineralized black shales of Devonian age from the Selwyn Basin, Northwest Territories (Canada) were analyzed by Nuclear Reaction Analyses (NRA) and electron microprobe for nitrogen and carbon in silicates, sulfides, phosphates and organic ma... Read More about Nitrogen and carbon partitioning in diagenetic and hydrothermal minerals from Paleozoic Black Shales, (Selwyn Basin, Yukon Territories, Canada).

Integrated Stratigraphy of the Lower and Middle Fernie Formation in Alberta and British Columbia, western Canada (2004)
Journal Article
Hall, R., McNicoll, V., Gröcke, D., Craig, J., & Jonhston, K. (2004). Integrated Stratigraphy of the Lower and Middle Fernie Formation in Alberta and British Columbia, western Canada. Rivista Italiana di Paleontologia e Stratigrafia, 110(1), 61-68. https://doi.org/10.13130/2039-4942/6264

The lower and middle parts of the Fernie Formation in central-western Alberta and south-eastern British Columbia, ranging from Pliensbachian to ?Bathonian (Early to Middle Jurassic) in age, and consisting mainly of fossiliferous dark shales and black... Read More about Integrated Stratigraphy of the Lower and Middle Fernie Formation in Alberta and British Columbia, western Canada.

Isotopic evidence for Late Jurassic-Early cretaceous climate change. (2003)
Journal Article
Gröcke, D., Price, G., Ruffell, A., Mutterlose, J., & Baraboshkin, E. (2003). Isotopic evidence for Late Jurassic-Early cretaceous climate change. Palaeogeography, Palaeoclimatology, Palaeoecology, 202(1-2), 97-118. https://doi.org/10.1016/s0031-0182%2803%2900631-x

Strontium-, oxygen- and carbon-isotope ratios have been determined from Late Jurassic–Early Cretaceous belemnites from the Volga Basin, Russia, and Kawhia Harbour, New Zealand. 87Sr/86Sr ratios derived from well-preserved belemnites from the Volga Ba... Read More about Isotopic evidence for Late Jurassic-Early cretaceous climate change..

Paleoecological reconstruction of a lower Pleistocene large mammal community using biogeochemical (δ13C, δ15N, δ18O, Sr: Zn) and ecomorphological approaches. (2003)
Journal Article
Palmqvist, P., Gröcke, D., Arribas, A., & Fariña, R. (2003). Paleoecological reconstruction of a lower Pleistocene large mammal community using biogeochemical (δ13C, δ15N, δ18O, Sr: Zn) and ecomorphological approaches. Paleobiology, 29(2), 205-229. https://doi.org/10.1017/s0094837300018078

Ecomorphological and biogeochemical (trace element, and carbon, nitrogen, and oxygen isotope ratios) analyses have been used for determining the dietary niches and habitat preferences of large mammals from lower Pleistocene deposits at Venta Micena (... Read More about Paleoecological reconstruction of a lower Pleistocene large mammal community using biogeochemical (δ13C, δ15N, δ18O, Sr: Zn) and ecomorphological approaches..

Chemostratigraphy of the Jurassic System: applications, limitations and implications for palaeoceanography. (2002)
Journal Article
Jenkyns, H., Jones, C., & Gröcke, D. (2002). Chemostratigraphy of the Jurassic System: applications, limitations and implications for palaeoceanography. Journal of the Geological Society, 159(4), 351-378. https://doi.org/10.1144/0016-764901-130

Current chemostratigraphical studies of the Jurassic System primarily involve the use of one sedimentary component (marine organic carbon), one divalent transition metal substituted in carbonate (manganese), and two isotopic tracers: strontium-isotop... Read More about Chemostratigraphy of the Jurassic System: applications, limitations and implications for palaeoceanography..

Strontium-isotope stratigraphy and oxygen-and carbon-isotope variation during the Middle Jurassic–Early Cretaceous of the Falkland Plateau, South Atlantic (2002)
Journal Article
Price, G., & Gröcke, D. (2002). Strontium-isotope stratigraphy and oxygen-and carbon-isotope variation during the Middle Jurassic–Early Cretaceous of the Falkland Plateau, South Atlantic. Palaeogeography, Palaeoclimatology, Palaeoecology, 183(3-4), 209-222. https://doi.org/10.1016/s0031-0182%2801%2900486-2

87Sr/86Sr data of belemnites are presented from a Middle Jurassic–Early Cretaceous succession from the Falkland Plateau (Deep Sea Drilling Project Sites 511 and 330) that was deposited in a periodically anoxic, semi-enclosed shallow water basin. Diag... Read More about Strontium-isotope stratigraphy and oxygen-and carbon-isotope variation during the Middle Jurassic–Early Cretaceous of the Falkland Plateau, South Atlantic.

The carbon isotope composition of ancient CO2 based on higher plant organic matter (2002)
Journal Article
Gröcke, D. (2002). The carbon isotope composition of ancient CO2 based on higher plant organic matter. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 360(1793), 633-658. https://doi.org/10.1098/rsta.2001.0965

Carbon isotope ratios in higher–plant organic matter (δ13Cplant) have been shown in several studies to be closely related to the carbon isotope composition of the ocean–atmosphere carbon reservoir, and, in particular, the isotopic composition of CO2.... Read More about The carbon isotope composition of ancient CO2 based on higher plant organic matter.

Palaeoclimate indicators (clay minerals, calcareous nannofossils, stable isotopes) compared from two successions in the late Jurassic of the Volga Basin (SE Russia). (2002)
Journal Article
Ruffell, A., Price, G., Mutterlose, J., Kessels, K., & Gröcke, D. (2002). Palaeoclimate indicators (clay minerals, calcareous nannofossils, stable isotopes) compared from two successions in the late Jurassic of the Volga Basin (SE Russia). Geological Journal, 37(1), 17-33. https://doi.org/10.1002/gj.903

A study of clay mineral and calcareous nannofossil abundances in late Jurassic–early Cretaceous sediments from the Volga Basin, SE Russia, is presented. From these results, we are able to compare some general patterns of mineralogical and palaeontolo... Read More about Palaeoclimate indicators (clay minerals, calcareous nannofossils, stable isotopes) compared from two successions in the late Jurassic of the Volga Basin (SE Russia)..