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Professor Darren Grocke's Outputs (160)

Advances in mollusc sclerochronology and sclerochemistry: tools for understanding climate and environment (2008)
Journal Article
Gröcke, D., & Gillikin, D. (2008). Advances in mollusc sclerochronology and sclerochemistry: tools for understanding climate and environment. Geo-Marine Letters, 28(5-6), 265-268. https://doi.org/10.1007/s00367-008-0108-4

This Special Issue of Geo-Marine Letters compiles papers on marine, estuarine and freshwater mollusc shells as recorders of environmental and climatic conditions. Considering that many past studies have differentiated geochemical investigations from... Read More about Advances in mollusc sclerochronology and sclerochemistry: tools for understanding climate and environment.

Out of America: Ancient DNA evidence for a New World origin of Late Quaternary Woolly Mammoths (2008)
Journal Article
Debruyne, R., Chu, G., King, C., Bos, K., Kuch, M., Schwarz, C., …Poinar, H. (2008). Out of America: Ancient DNA evidence for a New World origin of Late Quaternary Woolly Mammoths. Current Biology, 18(17), 1320-1326. https://doi.org/10.1016/j.cub.2008.07.061

Although the iconic mammoth of the Late Pleistocene, the woolly mammoth (Mammuthus primigenius), has traditionally been regarded as the end point of a single anagenetically evolving lineage, recent paleontological and molecular studies have shown tha... Read More about Out of America: Ancient DNA evidence for a New World origin of Late Quaternary Woolly Mammoths.

Assessing pedogenic calcite stable-isotope values: Can positive linear covariant trends be used to quantify palaeo-evaporation rates? (2008)
Journal Article
Ufnar, D., Gröcke, D., & Beddows, P. (2008). Assessing pedogenic calcite stable-isotope values: Can positive linear covariant trends be used to quantify palaeo-evaporation rates?. Chemical Geology, 256(1-2), 46-51. https://doi.org/10.1016/j.chemgeo.2008.07.022

Palaeoclimate models suggest enhanced evaporation rates in subtropical regions (15–30° latitude) during greenhouse-world conditions, however, there are no empirical data to support these estimates. Laboratory evaporation experiments have shown that c... Read More about Assessing pedogenic calcite stable-isotope values: Can positive linear covariant trends be used to quantify palaeo-evaporation rates?.

Precipitation rates and atmospheric heat transport during the Cenomanian greenhouse warming in North America: Estimates from a stable isotope mass-balance model (2008)
Journal Article
Ufnar, D., Ludvigson, G., González, L., & Gröcke, D. (2008). Precipitation rates and atmospheric heat transport during the Cenomanian greenhouse warming in North America: Estimates from a stable isotope mass-balance model. Palaeogeography, Palaeoclimatology, Palaeoecology, 266(1-2), 28-38. https://doi.org/10.1016/j.palaeo.2008.03.033

Stable isotope mass-balance modeling results of meteoric δ18O values from the Cenomanian Stage of the Cretaceous Western Interior Basin (KWIB) suggest that precipitation and evaporation fluxes were greater than that of the present and significantly d... Read More about Precipitation rates and atmospheric heat transport during the Cenomanian greenhouse warming in North America: Estimates from a stable isotope mass-balance model.

Tracing the ecophysiology of ungulates and predator–prey relationships in an early Pleistocene large mammal community (2008)
Journal Article
Palmqvist, P., Pérez-Claros, J., Janis, C., & Gröcke, D. (2008). Tracing the ecophysiology of ungulates and predator–prey relationships in an early Pleistocene large mammal community. Palaeogeography, Palaeoclimatology, Palaeoecology, 266(1-2), 95-111. https://doi.org/10.1016/j.palaeo.2008.03.015

Research into the reconstruction of ancient communities in terms of dietary regimes, habitat preferences and ecological interactions of species has focused predominantly on biogeochemistry or ecomorphology alone and not in combination. The Venta Mice... Read More about Tracing the ecophysiology of ungulates and predator–prey relationships in an early Pleistocene large mammal community.

A stratigraphic test of the terrestrial carbon-isotope record of the latest Albian OAE from the Dakota Formation, Nebraska (2008)
Journal Article
Gröcke, D., & Joeckel, R. (2008). A stratigraphic test of the terrestrial carbon-isotope record of the latest Albian OAE from the Dakota Formation, Nebraska

Recently, the Albian–Cenomanian boundary was identifi ed in a terrestrial sequence at Rose Creek Pit (Gröcke et al. 2006) using carbon-isotope stratigraphy of bulk sedimentary organic matter and charcoal. However, within terrestrial sequences there a... Read More about A stratigraphic test of the terrestrial carbon-isotope record of the latest Albian OAE from the Dakota Formation, Nebraska.

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).