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Chickahominy Formation

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Series: GSA Special Papers
Published: 01 January 2009
DOI: 10.1130/2009.2458(31)
... Core descriptions, thin-section analyses, and X-ray powder diffraction analyses of whole-rock samples and clay-sized fractions were employed to interpret the sedimentology and mineralogy of synimpact Exmore beds and the overlying Chickahominy Formation. This study attempts to explain the origin...
Series: GSA Special Papers
Published: 01 January 2009
DOI: 10.1130/2009.2458(04)
... siliciclastics, with the exception of Pleistocene sand, clay, and gravel. The lowest postimpact unit is the upper Eocene Chickahominy Formation (443.9–350.1 m). At 93.8 m, this is the maximum thickness yet recovered for deposits that represent the return to “normal marine” sedimentation. The Drummonds Corner...
Series: GSA Special Papers
Published: 01 January 2009
DOI: 10.1130/2009.2458(29)
... the collapsing ejecta plume was terminated by the time of deposition of the 458 m material. This raises questions about the positioning of the exact upper contact of Exmore breccia to post-Exmore sediment (Chickahominy Formation), which is currently placed at 444 m depth and which possibly should be revised...
Journal Article
Journal: Geology
Published: 01 November 2002
Geology (2002) 30 (11): 995-998.
... Eocene paleoenvironment allowed species-rich assemblages of foraminifera, ostracodes, dinoflagellates, radiolarians, and calcareous nannoplankton to quickly reoccupy the crater basin, as documented in the first sample of the Chickahominy Formation above the dead zone. The USGS-NASA Langley corehole...
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Journal Article
Published: 01 March 2011
Journal of Paleontology (2011) 85 (2): 271-278.
... strata (Old Church Formation) are exposed, and on the south side of the upper tidal portion of the James River east of Hopewell, where the middle Eocene Piney Point Formation occurs ( Ward, 1984 ). Upper Eocene deposits (the Chickahominy Formation) are known from Virginia ( Powars and Bruce, 1999...
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FIGURE 4 —Altered and unaltered material. Scale bar is 50 micrometers. (A) ...
in > PALAIOS
Published: 01 June 2003
focus. (F) Spiniferites sp., unaltered, R6110 AK, Chickahominy Formation, USGS-NASA Langley core, Hampton, Virginia, right-lateral view at mid-focus. (G, H) Spiniferites sp., fragment showing bubbles formed at the base of processes, R6110 DH, Crater unit B, USGS-NASA Langley core, Hampton, Virginia
Image
Figure 3. Stratigraphic column showing sample locations (numbered black rec...
in > Geology
Published: 01 November 2002
marine clay (Chickahominy Formation) in NASA Langley core. A: Split core segment (sample 5) in dead zone just above fallout layer shows submillimeter-scale, horizontal, parallel laminae of clay, silt, and sand, with submillimeter lenses of sand. Laminae and lenses of fine to very fine, white, micaceous
Image
FIGURE 3 —Unaffected material and welded clumps from the USGS-NASA Langley ...
in > PALAIOS
Published: 01 June 2003
FIGURE 3 —Unaffected material and welded clumps from the USGS-NASA Langley core. (A) Typical strew-mount microscope slide, post-impact, Chickahominy Formation, no clumps, shown normal size. (B) Microscope slide from the sediment matrix from the Exmore beds with visible clumps, shown normal size. (C
Journal Article
Published: 01 May 2011
Journal of Sedimentary Research (2011) 81 (5): 348-354.
.... , 2009 , The mineralogy of the Exmore beds—Chickahominy Formation boundary section of the Chesapeake Bay impact structure revealed in the Eyreville core , in Gohn , G.S. , Koeberl , K. , Miller , K.G. , and Reimold , W.U. , eds., The ICDP-USGS Deep Drilling Project in the Chesapeake...
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Journal Article
Journal: Geology
Published: 01 August 2004
Geology (2004) 32 (8): 717-720.
... was deposited before 34 Ma ( Albin and Wampler, 1996 ). Glauconite ages also indicate that the upper Clinchfield is at least 35.7 ± 0.6 Ma ( Albin, 1997 ). Additionally, Ward (1989) asserted that the marine muds of the Twiggs Clay Member are correlative with the Chickahominy Formation of Virginia, the first...
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Journal Article
Journal: PALAIOS
Published: 01 June 2003
PALAIOS (2003) 18 (3): 275-285.
... focus. (F) Spiniferites sp., unaltered, R6110 AK, Chickahominy Formation, USGS-NASA Langley core, Hampton, Virginia, right-lateral view at mid-focus. (G, H) Spiniferites sp., fragment showing bubbles formed at the base of processes, R6110 DH, Crater unit B, USGS-NASA Langley core, Hampton, Virginia...
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Journal Article
Journal: Geology
Published: 01 August 2003
Geology (2003) 31 (8): 697-700.
... saipanensis in both matrix and postimpact Chickahominy Formation sediments constrains the age of impact to between 36.0 and 34.2 Ma ( Berggren et al., 1995 ). Examination of sediments from the Chesapeake Bay impact crater has shown that the intense pressure and heat released during impact had a lasting...
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Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(06)
EISBN: 9780813756400
...-isostatic adjustments, active tectonics in an intraplate setting, river incision, periglacial processes, and soil-saprolite formation. This field trip explores a geologic and geomorphic transect of the mid-Atlantic margin, starting in the Blue Ridge of Virginia and proceeding to the east across...
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Series: GSA Field Guide
Published: 01 January 2015
DOI: 10.1130/2015.0040(07)
EISBN: 9780813756400
..., 1999 ; Powars et al., 2015 ) but is not covered in this field trip, although a possibly equivalent unit is exposed above the classic Miocene section in the Calvert Cliffs. Units such as the upper Eocene Exmore and Chickahominy Formations, and the informal Oligocene Delmarva beds and Drummond Corner...
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Series: GSA Special Papers
Published: 29 November 2018
DOI: 10.1130/2018.2537
EISBN: 9780813795379
... in the later resurge diamictons. A relative increase in the amount of Upper Cretaceous and Paleogene target sediments derived from outside the brim (relative to Potomac sediments) occurred because the previously accessible sections of the Potomac Formation within the structure were now covered by the earlier...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(06)
...-sediment deformation structures characteristic of dewatering. The gradational upper contact of the stratified member with clayey marine sediments of the postimpact Chickahominy Formation is difficult to delineate and has been placed differently by different investigators (e.g., Poag et al., 2004 ; Gohn...
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Journal Article
Published: 01 December 2013
Clays and Clay Minerals (2013) 61 (6): 551-565.
... ) The mineralogy of the Exmore beds – Chickahominy Formation boundary section of the Chesapeake Bay impact structure revealed in the Eyreville core . Geological Society of America Special Paper 458 , 723 – 746 . Ferrell R.E. Hart G.F. Swamy S. Murthy B. ( 1998 ) X-ray mineralogy...
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Journal Article
Published: 01 August 2012
Clays and Clay Minerals (2012) 60 (4): 387-404.
.... Dypvik H . ( 2009 ) The mineralogy of the Exmore beds – Chickahominy Formation boundary section of the Chesapeake Bay impact structure revealed in the Eyreville core . Geological Society of America Special Paper , 458 , pp. 723 – 746 . Ferrell R.E. Hart G.F. Swamy S. Murthy B...
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Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.256.01.23
EISBN: 9781862395046
... but to be normally overlain by the Late Eocene Chickahominy Formation. The structure is not a simple basin but has a raised ring and central eminence within the basin defined by the outer rim. The top of the rim escarpment is covered by 20–30 m of ejecta blanket. The breccia is associated with slumped megablocks...
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Journal Article
Published: 01 January 2017
The Canadian Mineralogist (2017) 55 (1): 145-177.
... 500 km distant. We present this supporting evidence in order from the strongest quantitative to moderate qualitative to weakest consequential. In a departure from the format of a conventional scientific paper, we evaluate the strength of the evidence immediately following its presentation...
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