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Rush, William; Self-Trail, Jean; Zhang, Yang; Sluijs, Appy; Brinkhuis, Henk; Zachos, James C; Ogg, James G; Robinson, Marci M (2023): Knapps Narrows Calcareous Nannofossil Biozonation over ETM2 and H2 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.957710

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Published: 2023-05-23 • DOI registered: 2023-06-21

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Abstract:
The Knapps Narrows core was drilled at 38.72129N, -76.33162W on the Eastern Shore of Maryland. The cored target interval lies between 84-102 meters in the Nanjemoy Formation. Calcareous nannofossil biozonation was established in conjunction with paleomagnetic data, allowing us to date the interval to approximately 53.7 mya. Benthic foraminiferal and bulk carbon isotope data allowed for further refinement of the dating of this interval, allowing us to identify ETM2 and H2 on the basis of carbon isotope stratigraphy. For analyses of benthic foraminifera 4-6 Anomalinoides acutus specimens were picked from the 180-250 μm size fraction at each interval. Dinoflagellate cyst assemblages were counted in order to allow for paleo-environmental analysis. Benthic foraminiferal δ18O and TEX86 temperature proxies were compiled over the interval of interest. Semi-quantitative clay mineral assemblages were used to test for changes in the weathering response over hyperthermal intervals. There is excellent agreement between the δ18O and TEX86 temperature proxies, although the highest temperatures do not correspond to either hyperthermal event. There is a noticeable increase in illite content during the ETM2 interval, and an absence of kaolinite. Dinoflagellate assemblages suggest changes in marine paleo-environmental conditions were driven by long-term trends rather than immediate responses to the hyperthermal events.
Keyword(s):
Benthic foraminifera; benthic foraminifera isotopes; Benthic foraminiferal stable isotopes; benthic foraminifera stable isotopes; calcareous nannofossil; Calcareous nannofossils; clay minerals; d13C; d18O; Dinoflagellate cysts; ETM2; Gamma-ray spectrometry; Maryland; nannofossil; nannofossils; Paleomagnetic data; paleomagnetism; TEX86
Supplement to:
Rush, William; Self-Trail, Jean; Zhang, Yang; Sluijs, Appy; Brinkhuis, Henk; Zachos, James C; Ogg, James G; Robinson, Marci M (in review): Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA. EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-58
Funding:
European Research Council (ERC), grant/award no. 771497: Evolution and Variability of Climate Sensitivity and Polar Amplification during CeNozoic Warm Climates (SPANC)
National Science Foundation (NSF), grant/award no. OCE-1658017: Collaborative Research: An Eocene perspective on future recovery rates of climate and ocean chemistry
National Science Foundation (NSF), grant/award no. OCE-2103513: Accomplishment Based Renewal: Intensification of the Hydrologic Cycle during the Paleocene-Eocene Thermal Maximum
Coverage:
Latitude: 38.721290 * Longitude: -76.331620
Date/Time Start: 2015-10-09T00:00:00 * Date/Time End: 2022-02-04T00:00:00
Event(s):
Knapps_Narrows * Latitude: 38.721290 * Longitude: -76.331620 * Location: Maryland * Method/Device: Core drilling (CDRILL)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
10 datasets

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Datasets listed in this bundled publication

  1. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Benthic isotopes of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957701
  2. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Calcareous nannofossils of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957707
  3. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Paleomagnetic of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957709
  4. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Palynology of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957708
  5. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Carbonate isotopes of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957700
  6. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Carbonate content of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957703
  7. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Clay determination of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957698
  8. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Geophysical measurements of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957704
  9. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): Magnetic workbook of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957705
  10. Rush, W; Self-Trail, J; Zhang, Y et al. (2023): TEX86 temperature proxies of Knapps Narrows sediment core from the Eastern Shore of Maryland. https://doi.org/10.1594/PANGAEA.957688