Kopp, Robert E; Schumann, Dirk; Raub, Timothy; Powars, David S; Godfrey, Linda V; Swanson-Hysell, Nicholas L; Maloof, Adam C; Vali, Hojatollah (2014): (Table S1) Qualitative and semi-quantitative abundance of magnetic particles in Paleocene-Eocene sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.831670, Supplement to: Kopp, RE et al. (2009): An Appalachian Amazon? Magnetofossil evidence for the development of a tropical river-like system in the mid-Atlantic United States during the Paleocene-Eocene thermal maximum. Paleoceanography, 24(4), PA4211, https://doi.org/10.1029/2009PA001783
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
On the mid-Atlantic Coastal Plain of the United States, Paleocene sands and silts are replaced during the Paleocene-Eocene Thermal Maximum (PETM) by the kaolinite-rich Marlboro Clay. The clay preserves abundant magnetite produced by magnetotactic bacteria and novel, presumptively eukaryotic, iron-biomineralizing microorganisms. Using ferromagnetic resonance spectroscopy and electron microscopy, we map the magnetofossil distribution in the context of stratigraphy and carbon isotope data and identify three magnetic facies in the clay: one characterized by a mix of detrital particles and magnetofossils, a second with a higher magnetofossil-to-detrital ratio, and a third with only transient magnetofossils. The distribution of these facies suggests that suboxic conditions promoting magnetofossil production and preservation occurred throughout inner middle neritic sediments of the Salisbury Embayment but extended only transiently to outer neritic sediments and the flanks of the embayment. Such a distribution is consistent with the development of a system resembling a modern tropical river-dominated shelf.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 38.722482 * Median Longitude: -75.916374 * South-bound Latitude: 37.200000 * West-bound Longitude: -77.400000 * North-bound Latitude: 40.120190 * East-bound Longitude: -74.032850
Date/Time Start: 1998-07-08T00:00:00 * Date/Time End: 2003-11-11T00:00:00
Minimum DEPTH, sediment/rock: 12.98 m * Maximum DEPTH, sediment/rock: 203.12 m
Event(s):
Ancora * Latitude: 39.692220 * Longitude: -74.849020 * Date/Time: 1998-07-08T00:00:00 * Elevation: 31.6 m * Location: New Jersey * Campaign: Leg174AX * Method/Device: Drilling/drill rig (DRILL)
Comment:
Where present, numerical counts of putative eukaryotic magnetofossils are based upon the number of particles in a magnetic extract observed under SEM on a single Cu grid within a ~40 micron by 50 micron frame. Observations of conventional magnetofossils are based on TEM. + indicates presence; ++ indicates high abundance; - indicates absence; blanks and ? indicate missing or inconclusive observations.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Altitude | Alt | km a.s.l. | Kopp, Robert E | ||
| 4 | Lithologic unit/sequence | Unit | Kopp, Robert E | |||
| 5 | - | - | Kopp, Robert E | Ferromagnetic resonance alpha value of sample | ||
| 6 | Magnetite | Mag | Kopp, Robert E | spearhead | ||
| 7 | Magnetite | Mag | Kopp, Robert E | pindle-shaped | ||
| 8 | Magnetite | Mag | Kopp, Robert E | large elongated hexaoctahedral | ||
| 9 | Magnetite | Mag | Kopp, Robert E | conventional bacterial | ||
| 10 | Magnetite | Mag | Kopp, Robert E | detrital |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
283 data points