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Nuwok Member

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Outcrop sediments of the Nuwok Member of the Sagavanirktok Formation at Carter Creek. A) Inset: Lidar-sourced digital elevation model of Carter Creek area from IfSAR data (DGGS Staff 2013). Primary photo: Orthorectified composite image created from three-dimensional model of outcrop. Perspective is adjusted such that all parts of the outcrop appear equidistant; view is along dip plane and contrast is enhanced. B) Photograph of middle part of section (approximately meters 44–64). Glendonites were found in situ in area highlighted by red box. Numerous specimens were found in the gully in the bottom of the photo.

Outcrop sediments of the Nuwok Member of the Sagavanirktok Formation at Car...

Published: 18 March 2024
Fig. 3. Outcrop sediments of the Nuwok Member of the Sagavanirktok Formation at Carter Creek. A) Inset: Lidar-sourced digital elevation model of Carter Creek area from IfSAR data ( DGGS Staff 2013 ). Primary photo: Orthorectified composite image created from three-dimensional model of outcrop
Image
Outcrop of Nuwok Member sediments measured in 2022 at Carter Creek, along with lithofacies associations, carbon isotope data, total organic carbon, and photographs of sediments in this section. Letters in blue squares denote thin-section photos A–F on right; letters in red circles refer to outcrop photos in Figure 5. All thin-section photographs are in plane-polarized light except for Part B, taken under cross-polarized light. A) Sand-size grains from a thick cross-stratified sand bed, showing a high proportion of lithic fragments, ∼ 83 m. B) Sandstone beds from ∼ 76 m, the only lithified sediment in the section. Carbonate cement is present between quartz and chert grains. C) Planispiral benthic foraminifera from silty muds near 64 m. D) Silty and sandy mud, collected from sediment directly adjacent (< 5 cm distance) to in situ glendonite at ∼ 55 m. E) Silts and very fine-grained sands from rippled beds near 46 m. F) Sandy, pebbly muds from ∼ 12 m, including grains composed of quartz, opaque minerals, and chert (pink clast). Qal, Quaternary alluvium; δ13Corg, ratio of 13C/12 C in organic matter, in parts per thousand (‰); VPDB, Vienna Pee Dee Belemnite (isotopic standard); TOC, total organic carbon; Mbr, Member; µm, micrometers; mm, millimeters; dm, decimeters; vfg, very fine-grained; x-strat, cross-stratification; o.m., organic matter; hz, horizontal.

Outcrop of Nuwok Member sediments measured in 2022 at Carter Creek, along w...

Published: 18 March 2024
Fig. 4. Outcrop of Nuwok Member sediments measured in 2022 at Carter Creek, along with lithofacies associations, carbon isotope data, total organic carbon, and photographs of sediments in this section. Letters in blue squares denote thin-section photos A–F on right; letters in red circles refer
Image
Macroscopic sedimentological features of the Nuwok Member of the Sagavanirktok Formation observed in outcrop. A) Subvertically oriented pebble in muds, interpreted as ice-rafted debris (IRD), ∼ 8 m. B) Pebbles, including basal lag, and bivalve fossils found in muddy sand interval, ∼ 12 m. C) Ripples and cross-stratification in sand bed ∼ 52 m. D)In situ glendonite in silty and sandy muds, ∼ 55 m. E) Large pebbles in fine-grained, muddy matrix, interpreted as IRD, ∼ 56 m. F) Paired mud drapes in sands, ∼ 56 m. G, H) Interbedded sand- and mud-dominated beds, ∼ 58 m. I) Cross-stratified sand bed, with cemented, lithified strata atop unconsolidated material, ∼ 75 m. J) Cross-stratified lithic arenite in the thickest sand bed in the section, ∼ 83 m. K) Sand bed near top of section with internal (potentially paired) mud drapes, ∼ 94 m.

Macroscopic sedimentological features of the Nuwok Member of the Sagavanirk...

Published: 18 March 2024
Fig. 5. Macroscopic sedimentological features of the Nuwok Member of the Sagavanirktok Formation observed in outcrop. A) Subvertically oriented pebble in muds, interpreted as ice-rafted debris (IRD), ∼ 8 m. B) Pebbles, including basal lag, and bivalve fossils found in muddy sand interval
Journal Article

Insights into glendonite formation from the upper Oligocene Sagavanirktok Formation, North Slope, Alaska, U.S.A.

John W. Counts, Madeleine L. Vickers, M. Rebecca Stokes, Whittney Spivey, Kristina F. Gardner, Jean M. Self-Trail, Jared T. Gooley, Ryan J. McAleer, Aaron M. Jubb, David W. Houseknecht, Richard O. Lease, Neil P. Griffis, Martin Vickers, Kasia Śliwińska, Hannah G.D. Tompkins, Adam M. Hudson
Published: 18 March 2024
Journal of Sedimentary Research (2024) 94 (2): 179–206.
DOI: https://doi.org/10.2110/jsr.2023.060
...Fig. 3. Outcrop sediments of the Nuwok Member of the Sagavanirktok Formation at Carter Creek. A) Inset: Lidar-sourced digital elevation model of Carter Creek area from IfSAR data ( DGGS Staff 2013 ). Primary photo: Orthorectified composite image created from three-dimensional model of outcrop...
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View PDF for article title, Insights into glendonite formation from the upper Oligocene Sagavanirktok Formation, North Slope, Alaska, U.S.A.
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Journal Article

High-latitude application of 87 Sr/ 86 Sr: Correlation of Nuwok beds on North Slope, Alaska, to standard Oligocene chronostratigraphy

David H. McNeil, Kenneth G. Miller
Journal: Geology
Published: 01 May 1990
Geology (1990) 18 (5): 415–418.
DOI: https://doi.org/10.1130/0091-7613(1990)018<0415:HLAOSS>2.3.CO;2
...David H. McNeil; Kenneth G. Miller Abstract Strontium isotope ratios ( 87 Sr/ 86 Sr) calculated from three samples of benthic foraminifers and one mollusc indicate an age range from 23.8 to 27.0 Ma for the Nuwok Member of the Sagavanirktok Formation, eastern North Slope, Alaska. Previous...
View PDF for article title, High-latitude application of 87 Sr&#x2F; 86 Sr: Correlation of <span class="search-highlight">Nuwok</span> beds on North Slope, Alaska, to standard Oligocene chronostratigraphy
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Image
A) Dip-oriented (SW to NE) schematic illustration of eastern Colville Foreland Basin sequence stratigraphy, as presented in Houseknecht (2019), showing Brookian sequences with the projected approximate equivalent location of Carter Creek shown by the black box. B) Generalized Cenozoic stratigraphy of the eastern Colville Foreland Basin, modified from Mull et al. (2003). Depiction of the Nuwok Member is modified from original to illustrate uncertainty in oldest depositional age of Nuwok strata. Stippled pattern, sandy sediments; untextured, fine-grained sediments; LCU, Lower Cretaceous unconformity; Miss, Mississippian.

A) Dip-oriented (SW to NE) schematic illustration of eastern Colville Fore...

Published: 18 March 2024
Cenozoic stratigraphy of the eastern Colville Foreland Basin, modified from Mull et al. (2003) . Depiction of the Nuwok Member is modified from original to illustrate uncertainty in oldest depositional age of Nuwok strata. Stippled pattern, sandy sediments; untextured, fine-grained sediments; LCU, Lower
Image
Selected age-diagnostic foraminifera found in sediments from the Nuwok Member at Carter Creek. A–C and G–I are SEM images, D–F were taken in visible reflected light. A)Turrilina alsatica. B, C)Buliminella elegantissima. D, E)Elphidium discoidale. F–H)Chilostomellina fimbriata. I)Nonionella sp.

Selected age-diagnostic foraminifera found in sediments from the Nuwok Memb...

Published: 18 March 2024
Fig. 6. Selected age-diagnostic foraminifera found in sediments from the Nuwok Member at Carter Creek. A–C and G–I are SEM images, D–F were taken in visible reflected light. A) Turrilina alsatica . B , C) Buliminella elegantissima . D , E) Elphidium discoidale . F – H) Chilostomellina
Image
87Sr/86Sr isotope values for glendonites and fossils from the Nuwok Member at the Carter Creek site, plotted on the latest age-calibrated global 87Sr/86Sr seawater reference curve from McArthur et al. (2020). New data reported here in white circles (glendonites and bivalves); previously published values from McNeil and Miller (1990) in red and blue squares. Errors of data measurements range from 0.0000111 to 0.00000917.

87 Sr/ 86 Sr isotope values for glendonites and fossils from the Nuwok Memb...

Published: 18 March 2024
Fig. 7. 87 Sr/ 86 Sr isotope values for glendonites and fossils from the Nuwok Member at the Carter Creek site, plotted on the latest age-calibrated global 87 Sr/ 86 Sr seawater reference curve from McArthur et al. (2020) . New data reported here in white circles (glendonites and bivalves
Image
Location of study area. A) Surface geology of central part of 1002 area in the Alaska National Wildlife Refuge (ANWR) and location of the Carter Creek outcrop. Modified from Bader and Bird (1986). B) Schematic interpretation of seismic lines 84-10 and 84-16 (A–Aʹ in Fig. 2A) by Potter et al. (1999). Red star indicates approximate projected stratigraphic position of the Nuwok Member seen in the outcrop at Carter Creek to the A–Aʹ seismic line; horizon interpretations are unmodified from original publication. Fm, Formation; SS, sandstone; LS, limestone; Grp, Group; ig., igneous; met, metamorphic; sed., sedimentary.

Location of study area. A) Surface geology of central part of 1002 area i...

Published: 18 March 2024
) by Potter et al. (1999) . Red star indicates approximate projected stratigraphic position of the Nuwok Member seen in the outcrop at Carter Creek to the A–Aʹ seismic line; horizon interpretations are unmodified from original publication. Fm, Formation; SS, sandstone; LS, limestone; Grp, Group; ig., igneous
Image
Macroscopic views of glendonites found at the Carter Creek locality. All scale bars 1 cm. All specimens were found on talus slopes and in gullies below exposed in situ beds of the Nuwok Member. A–O) Type A glendonites, characterized by numerous crystal apices often surrounding a central larger individual crystal, with the overall cluster typically 5–15 cm in size. Images are arranged to show a continuum of increasing numbers of accessory crystals and gradational range of Type A morphologies, from bladed forms dominated by a single crystal, to stellate aggregates. P–T) Type B glendonites, characterized by a large (dm scale), thick, singly or doubly terminated crystal with no accessory crystals. Specimens were found in talus slopes surrounding the lower part of the section (approximately 0–45 m).

Macroscopic views of glendonites found at the Carter Creek locality. All sc...

Published: 18 March 2024
Fig. 8. Macroscopic views of glendonites found at the Carter Creek locality. All scale bars 1 cm. All specimens were found on talus slopes and in gullies below exposed in situ beds of the Nuwok Member. A – O) Type A glendonites, characterized by numerous crystal apices often surrounding
Journal Article

THE ASTARTE (BIVALVIA: ASTARTIDAE) THAT DOCUMENT THE EARLIEST OPENING OF BERING STRAIT

LOUIE MARINCOVICH, JR.,, KONSTANTIN B. BARINOV, ANTON E. OLEINIK
Published: 01 March 2002
Journal of Paleontology (2002) 76 (2): 239–245.
DOI: https://doi.org/10.1666/0022-3360(2002)076<0239:TABATD>2.0.CO;2
... Schumacher, 1817 . However, there are no records of Tridonta from Miocene or younger Tertiary deposits in the Arctic and North Atlantic oceans ( Fig. 1 ). MacNeil (1957) cited an occurrence of a similar-looking Astarte sp. in lower beds of the Neogene type Nuwok Member of the Sagavanirktok Formation...
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Journal Article

Correlation of Tertiary Formations of Alaska

F. S. MacNeil, J. A. Wolfe, D. J. Miller, D. M. Hopkins
Journal: AAPG Bulletin
Published: 01 November 1961
AAPG Bulletin (1961) 45 (11): 1801–1809.
DOI: https://doi.org/10.1306/BC743735-16BE-11D7-8645000102C1865D
... Formation as originally defined and mapped by G. C. Martin ( Miller, 1951 , p. 1920). The base of the Katalla Formation is here drawn at the base of a thick sandstone member, the units a and h of Martin (1908 , p. 37). 18b. The Tokun Formation ( Martin, 1908 , p. 35–37) is here restricted...
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Journal Article

PALYNOLOGY OF EOCENE STRATA IN THE SAGAVANIRKTOK AND CANNING FORMATIONS ON THE NORTH SLOPE OF ALASKA

NORMAN O. FREDERIKSEN, LUCY E. EDWARDS, THOMAS A. AGER, THOMAS P. SHEEHAN
Journal: Palynology
Published: 01 January 2002
Palynology (2002) 26 (1): 59–93.
DOI: https://doi.org/10.2113/0260059
... members (Text-Fig. 4 ), in ascending order, the Sagwon, Franklin Bluffs, and Nuwok Members ( Detterman et al., 1975 ). The type section of the Sagwon Member is about 50 km to the south of Franklin Bluffs (Text-Fig. 2 ). The type locality of the Franklin Bluffs Member, and of the Sagavanirktok Formation...
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View PDF for article title, PALYNOLOGY OF EOCENE STRATA IN THE SAGAVANIRKTOK AND CANNING FORMATIONS ON THE NORTH SLOPE OF ALASKA
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Journal Article

Depositional Relations of Cretaceous and Lower Tertiary Rocks, Northeastern Alaska

C. M. Molenaar
Journal: AAPG Bulletin
Published: 01 July 1983
AAPG Bulletin (1983) 67 (7): 1066–1080.
DOI: https://doi.org/10.1306/03B5B6FF-16D1-11D7-8645000102C1865D
.... Farther north, on Marsh Creek anticline near Camden Bay, shallow-marine strata of late Miocene(?) to early Pliocene age have been assigned to the Nuwok Member of the Sagavanirktok Formation ( Detterman et al, 1975, p. 37 ). Bird (1982) included these rocks in the “Sagavanirktok-Colville sandstone...
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Journal Article

Correlation of Cenozoic sequences of the Canadian Arctic region and Greenland; implications for the tectonic history of northern North America

J.C. Harrison, U. Mayr, D.H. McNeil, A.R. Sweet, J.J. Eberle, D.J. McIntyre, C.R. Harington, J.A. Chalmers, G. Dam, H. Nøhr-Hansen
Published: 01 September 1999
Bulletin of Canadian Petroleum Geology (1999) 47 (3): 223–254.
DOI: https://doi.org/10.35767/gscpgbull.47.3.223
..., northern Ellesmere Island (zircon U/Pb age of 88+20,-21 Ma; Trettin and Parrish, 1987). In central Nuussuaq, West Greenland, a lower Campanian unconformity is present between the upper Albian-lowermost Campanian Atane Formation and the Campanian Aaffarsuaq Member. The unconformity marks a major change...
View PDF for article title, Correlation of Cenozoic sequences of the Canadian Arctic region and Greenland; implications for the tectonic history of northern North America
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Journal Article

TRADITIONAL AND EMERGING GEOCHEMICAL PROXIES IN FORAMINIFERA

Miriam E. Katz, Benjamin S. Cramer, Allison Franzese, Bärbel Hönisch, Kenneth G. Miller, Yair Rosenthal, James D. Wright
Published: 01 April 2010
Journal of Foraminiferal Research (2010) 40 (2): 165–192.
DOI: https://doi.org/10.2113/gsjfr.40.2.165
... mass has been isolated from the surface. For example, whereas the Atlantic vs. Pacific δ 13 C contrast in the modern ocean reflects aging, the δ 13 C contrast in the deep Atlantic behaves conservatively and represents a mixing between North Atlantic deepwater and Antarctic bottom water end-member...
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Book Chapter

Stratigraphic Descriptions

Author(s)
Thomas X. Homza, Steven C. Bergman
Book: A Geologic Interpretation of the Chukchi Sea Petroleum Province: Offshore Alaska, USA
Series: AAPG Memoir
Publisher: The American Association of Petroleum Geologists
Published: 01 January 2019
DOI: 10.1306/13662198M1223819
EISBN: 9781629812830
... Bluffs and Nuwok members ( Detterman et al., 1975 ; Decker, 2007 , 2010 ), which consist of a wide variety of dominantly nonmarine and lesser shallow marine clastic sediments including sandstone (some of eolian origin, Detterman et al., 1975 , p. 39), chert pebble conglomerate, minor limestone...
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Book Chapter

Biostratigraphy, Age, and Paleoenvironment of the Pliocene Beaufort Formation on Meighen Island, Canadian Arctic Archipelago

Author(s)
R.W. Barendregt, J.V. Matthews Jr.*, V. Behan-Pelletier, J. Brigham-Grette, J.G. Fyles†, L.E. Ovenden, D.H. McNeil, E. Brouwers, L. Marincovich, N. Rybczynski, T.L. Fletcher§
Book: Biostratigraphy, Age, and Paleoenvironment of the Pliocene Beaufort Formation on Meighen Island, Canadian Arctic Archipelago
Series: GSA Special Papers
Publisher: Geological Society of America
Published: 08 September 2021
DOI: 10.1130/2021.2551(01)
EISBN: 9780813795515
... sediments at 13-17-8 (Table S3). As a genus, Rabilimis ranges from late Miocene (Nuwok Member of the Sagavanirktok Formation) to the present day, occurring in subfrigid and frigid marine environments ( Brouwers and Marincovich, 1988 ; Brouwers, 1994 ; Repenning et al., 1987) . Sarsicytheridea bradii...
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Abstract
View PDF for content titled, Biostratigraphy, Age, and Paleoenvironment of the Pliocene Beaufort Formation on Meighen Island, Canadian Arctic Archipelago
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ABSTRACT Meighen Island, in the Canadian Arctic Archipelago, is one of the most important localities for study of the late Neogene Beaufort Formation because of the presence of marine sediments interbedded with terrestrial fossiliferous sands. The stratigraphic succession, fossils from the marine beds, correlation with reconstructions of sea level, and paleomagnetic data from the Bjaere Bay region of the island suggest that the Beaufort Formation on Meighen Island was likely deposited either at 3.2–2.9 Ma or during two intervals at ca. 4.5 Ma and 3.4 Ma. The exposed Beaufort Formation on Meighen Island probably encompasses at least one warm interval and eustatic sea-level highstand of the Pliocene. Fossils of plants and arthropods are abundant in the alluvial sands exposed in the Bjaere Bay region. The lower part of the sequence (Unit A), beneath the muddy marine sequence (Unit B), contains plant taxa that have not been seen above the marine beds. Sediments below the marine beds are dominated more by fossils of trees, whereas the organic debris from above marine beds contains many fossils of plants, insects, and mites characteristic of open treeless sites. Regional tree line probably occurred on Meighen Island during deposition of the upper sediments, which implies a mean July climate at least 9 °C warmer than at present. When the marine sediments were deposited, nearshore water temperatures probably did not fall below 0 °C; hence, the Arctic Ocean probably lacked perennial ice cover. This confirms recent modeling experiments exploring the causes of Arctic amplification of temperature that have found the removal of sea ice to be a key factor in resolving previous proxy-model mismatches.