Paraalnipollenites, a New Form Genus From Uppermost Cretaceous and Paleocene Rocks of Arctic Canada and Russia

Hills, L. V.; Wallace, Samuel J.

doi:10.4095/100883

Cited by 3 publications

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“…The ranges of M. amplus,-M. triorbicularis (with exception of its middle Eocene occurrence; see Green River discussion, Johnson and May, 1978b), and T. anguloluminosus are published in Leffingwell (1966). The ranges of Carya and Pistillipollenites are reported in Leopold and MacGinitie (1972), and the range of Paraalnipollenites is reported in Hills and Wallace (1969). Thus, the age of the Atwell Gulch Member of the Wasatch Formation is suggested to be late Paleocene.…”

Section: Debeque Areamentioning

confidence: 91%

A study of the Cretaceous-Tertiary unconformity in the Piceance Creek basin, Colorado; the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation

Johnson¹,

May²

1980

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Detailed work in the southwest Piceance Creek basin and reconnaissance work elsewhere in the basin have shown the presence of a major regional unconformity between rocks of Late Cretaceous and Tertiary age. The time gap represented by this unconformity in the southwestern part of the basin, based on palynomorph studies, is from late Campanian or early Maestrichtian to late Paleocene time. The Cretaceous rocks beneath the unconformity consist of gray-weathering lenticular sandstone units as thick as 30 m and more, separated by gray claystone, gray mudstone, and thin coal beds. Lenses of small chert pebbles are scattered throughout the upper 410 m of Cretaceous strata underlying the unconformity, but they are most abundant in the uppermost 150 m.The uppermost 50 to 150 m of the section beneath the unconformity crop out in a distinctive white color. Petrographic and X-ray mineralogy studies at Hunter Canyon in the southwestern part of the basin show that the white color is due to a breakdown of feldspar and subsequent accumulation of kaolinite, and it probably marks a paleoweathering profile developed during the time interval represented by the unconformity. Paleosoils are locally preserved in the upper few meters as well. If the kaolinitic zone is a paleoweathering profile as we believe, however, then it is a secondary characteristic superimposed on whatever rocks were being subjected to surface weathering at that time. Rates of erosion during this time interval were probably not constant throughout the basin and consequently the presently preserved kaolinitic zone is probably not everywhere at the same stratigraphic level.This kaolinitic, sparsely conglomeratic zone has been called the Ohio Creek Conglomerate or the Ohio Creek Formation by previous workers. The presence of conglomerate and the white color, the two features used to define the formation, are independent of each other, however, and need not occur together. We recommend, therefore, that the Ohio Creek Formation be reduced in stratigraphic rank to member and redefined as the white-colored kaolinitic zone, which may or may not contain chert-pebble conglomerate, found at the top of the Hunter Canyon or Mesaverde Formation.

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Section: Debeque Areamentioning

confidence: 91%

A study of the Cretaceous-Tertiary unconformity in the Piceance Creek basin, Colorado; the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation

Johnson¹,

May²

1980

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“…The Eureka Sound Formation as so defined is a complex deposit ranging in age from Maastrichtian (latest Cretaceous) to Middle Eocene (c.f. Hills and Wallace, 1969). Although in part a syntectonic deposit, it is older than the last major phase of orogenesis in the eastern Arctic Archielago (Tozer, 1970;Balkwill et al, 1975).…”

Section: (Inmentioning

confidence: 99%

Tertiary Coal Resources, Eastern Arctic Archipelago

Bustin¹

1980

ARCTIC

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In the eastern Canadian Arctic Archipelago major coal resources occur within the Late Cretaceous and Tertiary Eureka Sound Formation. The formation, which ranges in thickness from thin erosional outliers on central Axel Heiberg Island to a maximum thickness of 3300 m on Fosheim Peninsula, Ellesmere Island, contains numerous thick seams of coal. The coal is highly variable in quality, but seams of clean, vitrain rich coal is highly variable in quality, but seams of clean, vitrain rich coal several metres thick are present. The rank of the coal ranges from lignite through sub-bituminous to high-volatile bituminous as measured by vitrinite reflectance. lnferred resources within the area of study are calculated as 30 000 million tonnes of which 15 O00 million tonnes are lignite, 11 000 million tonnes are sub-bituminous and 4000 million tonnes are high-volatile bituminous. The area encompassed only a small portion of the known outcrop area of Late Cretaceous and Tertiary coal measures in the Canadian Arctic Archipelago which indicates that considerable further resources are present. ReSUMe. Dans l'archipel arctique oriental Canadien, la plus grande partie des ressources en charbon se situe dans le crétacé terminal et la formation Eureka Sound du Tertiaire. L'epaisseur de la formation est très mince aux buttes temoins d'érosion de la partie centrale de I'ile d'Axe1 Héiberg mais elle peut atteintre 3300 m sur la Peninsule de Fosheim dans Vile l'Ellesmere avec de nombreuses veines épaisses de charbon. La qualité de ce charbon est très variable mais il y a des veines de quelques mètres de charbon propre et riche en vitrinite. La qualite de charbon va de la lignite jusqu' aux charbons bitumineux très volatiles ou sub bitumineux, comme l'indique le pouvoir reflecteur de la vitrinite. Les reserves limitées à cette seule region sont estimées à environ 30. lo9 tonnes dont 15.109 tonnes de lignite, ll.109 de charbon sub bitumineux et 4. lo9 de charbon bitumineux très volatile. Cette région n'est qu'une petite partie des affleurements connus dans l'archipel arctique Canadien où la formation crétacé, terminal a Tertiaire est riche en charbon, ceci indique qu'existent des reserves supplémentaires considerable.

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Palynology of Maastrichtian and Paleocene rocks, lower Colville River region, North Slope of Alaska

Frederiksen¹,

Ager²,

Edwards³

1988

Can. J. Earth Sci.

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Outcrops of Maastrichtian rocks are rare on the North Slope of Alaska, and it is even more unusual to find outcrops of Maastrichtian and Paleocene age in the same vicinity. In general, Late Cretaceous and Paleogene rocks have not been well dated in published papers pertaining to northern Alaska. In this article, we describe palynomorph assemblages from 20 outcrop samples taken from nine localities along the lower Colville River and nearby areas. The latest Cretaceous palynomorph assemblages that are from marine rocks contain late Campanian or Maastrichtian dinoflagellate cysts; however, these cysts and other marine fossils are absent from the Tertiary samples, indicating that the Tertiary strata are nonmarine. Our latest Cretaceous and early Tertiary samples contain abundant spores and pollen grains and can be readily dated by reference to well-known pollen assemblages from the northern Great Plains and northwestern Canada. By dating each sampled outcrop, we can approximate the position of the Cretaceous–Tertiary boundary in the study area. Outcrop samples near the boundary are too widely separated stratigraphically to permit us to determine whether or not an unconformity exists at the boundary in the study area. Using spores, pollen grains, and dinoflagellate cysts, we date the samples below the Cretaceous–Tertiary boundary as being of approximately mid-Maastrichtian age and the samples above the boundary as being undifferentiated Paleocene in age. On the North Slope, as in regions to the east and south, the Maastrichtian pollen assemblages represent a different kind of flora and vegetation than the Paleocene assemblages. The Maastrichtian assemblages have moderately high diversities of angiosperm pollen taxa, most of which were probably insect pollinated. In contrast, the Paleocene assemblages have low diversities of angiosperm taxa, and many of these taxa were probably wind pollinated. Differences between the mid-Maastrichtian and Paleocene assemblages may have been caused at least in part by climatic changes but may also have been caused by the effects of a hypothesized bolide impact at the end of the Maastrichtian for which there is increasing evidence.

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Paraalnipollenites, a New Form Genus From Uppermost Cretaceous and Paleocene Rocks of Arctic Canada and Russia

Cited by 3 publications

References 0 publications

A study of the Cretaceous-Tertiary unconformity in the Piceance Creek basin, Colorado; the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation

A study of the Cretaceous-Tertiary unconformity in the Piceance Creek basin, Colorado; the underlying Ohio Creek Formation (Upper Cretaceous) redefined as a member of the Hunter Canyon or Mesaverde Formation

Tertiary Coal Resources, Eastern Arctic Archipelago

Palynology of Maastrichtian and Paleocene rocks, lower Colville River region, North Slope of Alaska

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