Publication Date:
2024-01-09
Description:
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.
Keywords:
-; Altitude; Ancora; Busch_Gardens; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Leg174AX; Lithologic unit/sequence; Magnetite; New Jersey; North American East Coast; Ocean Drilling Program; ODP; Randall_Farm; Sea_Girt; Surprise_Hill
Type:
Dataset
Format:
text/tab-separated-values, 283 data points
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