Geological Survey of Denmark and Greenland Bulletin 19 ... - Geus

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Fig. 68. Outcrop of the Itilli Formation in the type locality in the Anariartorfik gorge showing amalgamated sandstones and thinly interbedded sandstones and mud - stones (prominent sandstone unit is approxi mately 30 m thick). Anariartorfik section 930–1010 m (Plate 2). For location, see Fig. 65. Fig. 69. Thinly interbedded sandstones and mudstones of the Itilli Formation in the Anariartorfik section (1070–1150 m; Plate 2). For location, see Fig. 65. Fig. 70. Amalgamated sandstones of the Itilli Formation (Anariartorfik Member) deposited from turbidity currents in slope channels overlying contorted mudstones (at river level). Pingunnguup Kuua section 460–510 m (Plate 2). The amalgamated sandstone unit is approximately 30 m thick and is cut by a dyke. For location, see Fig. 65. 86
and include clasts of intraformational mudstone, sandstone (probably derived from the underlying Atane For - mation), redeposited concretions and basement lithologies. On the north coast of Nuussuaq and on Svartenhuk Halvø, the formation is dominated by mudstones, thinly interbedded sandstones and mudstones, and bioturbated thinly interbedded sandstones and mudstones. These lithologies are arranged in coarsening-upward successions 10–50 m thick (Fig. 75). At Kussinerujuk on the north coast of Disko, the formation consists of sandstones and conglomerates with angular cobbles and boulders of mudstone, sandstone, or interbedded sandstone and mudstone. Other clasts consist of rounded pebbles of quartz and clay ironstone (Fig. 77; Pulvertaft & Chalmers 1990, fig. 6). At Asuk, the formation consists of a basal sandstone or conglomerate bed succeeded by sand-streaked mudstones (Fig. 55). Fossils. Ammonites, belemnites, inoceramid bivalves (Fig. 71) and rare crustaceans and corals are present in the formation at several localities on Nuussuaq and Svartenhuk Halvø (Birkelund 1965; Rosenkrantz 1970; Dam et al. 2000). However, most of these are not found in situ in the outcrops and may furthermore be reworked intraformationally or derived from older deposits. Dinocysts, spores and pollen occur throughout in small numbers but cannot be determined neither in the lower part of the Umiivik-1 and GRO#3 wells nor from the outcrops in the Itilli valley. Burrows are occasionally present at the top of sandstone beds. Details of fossil contents are presented under the description of individual members. Depositional environment. The Itilli Formation was primarily deposited in slope and submarine fan environments. In the type area the amalgamated sandstones were deposited in slope channels initiated during sea level lowstands whereas the mudstones and the thinly interbedded sandstones and mudstones were deposited in interchannel slope areas (Dam & Sønderholm 1994). Details on the depositional environment are presented under the description of individual members. Boundaries. On the north coast of Nuussuaq, the Itilli Formation overlies the Atane Formation in a small and poorly exposed section at high altitude immediately east of the Ikorfat Fault (Fig. 22; A.K. Pedersen et al. 2006b). The boundary with the underlying Atane Formation is well exposed on central Nuussuaq along the northern slope of the Aaffarsuaq valley between Qilakitsoq and Tunoqqu (Fig. 82; Nøhr-Hansen 1996; Dam et al. 2000) and on northern Disko at Kussinerujuk and Asuk (Fig. 2). In Aaffarsuaq, the lower boundary is placed at the unconformity between the Santonian deltaic deposits of the Atane Formation and the first turbidite sandstone or mudstone deposits of the Campanian Aaffarsuaq Member (Fig. 83). At Kussinerujuk and Asuk, the lower boundary is an erosional unconformity between the deltaic deposits of the Atane Formation and the slope deposits of the Itilli Formation (Figs 55, 77, 78, 79). The upper boundary is well exposed on northern Nuussuaq where it is defined at a major unconformity with the upper Maastrichtian – Lower Paleocene Anner - tuneq Conglomerate Member of the Kangilia Formation (Figs 72, 76, 87). However, in areas outside the distri - bution of the Annertuneq Conglomerate Member, there 28 cm Fig. 71. Giant inoceramid bivalves on top of a turbidite sandstone bed of the Itilli Formation (Aaffarsuaq Member) in the second ravine east of Qilakitsoq. For location, see Fig. 82. 87
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GEOLOGICAL SURVEY OF DENMARK AND GR
Page 4 and 5:
Contents Abstract . . . . . . . . .
Page 7 and 8:
Preface The onshore Cretaceous-Pale
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Introduction The Nuussuaq Basin bel
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chemistry of the Nuussuaq Basin hav
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Fig. 5. Plant fossils from the Atan
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Peak 2010 m Peak 1900 m Peak 1760 m
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A lithostratigraphy for the marine
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to provide further funding for stud
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DGR Geological setting As a result
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TSS 8 Agatdal Fm Eqalulik Fm Kangil
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A Svartenhuk Halvø 50 km B Hinterl
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Nuussuaq Group new group History. T
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ley (Figs 2, 40, 65). The section a
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Central Nuussuaq Agatdalen South co
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3 10 4 6 5 Qorlortorssuaq Slibesten
Page 35 and 36: volcanic sediments are referred to
Page 37 and 38: Fig. 20. View from Uummannaq toward
Page 39 and 40: In the Kuuk area, the sediments ove
Page 41 and 42: m m 15 14 14 13 12 11 10 9 8 7 6 5
Page 43 and 44: Kome Formation m 40 30 20 D tial re
Page 45 and 46: Fig. 28. Reference locality of the
Page 47 and 48: Vaigat Fm Vesterfjeld Slibestensfje
Page 49 and 50: Gilbert delta in the Ikorfat area (
Page 51 and 52: 150 300 450 100 250 400 m 550 50 20
Page 53 and 54: Fig. 36. Outcrop of the Upernivik N
Page 55 and 56: Correlation. The Upernivik Næs flo
Page 57 and 58: 12’ 09’ 15’ 06’ 03’ Saqqa
Page 59 and 60: m 0 GGU 247801 200 400 247815 ★
Page 61 and 62: wave-rippled sand streaked mudstone
Page 63 and 64: the formation in the marine mudston
Page 65 and 66: d d Fig. 47. Type locality of the S
Page 67 and 68: Fig. 49. Cross-bedded medium- to co
Page 69 and 70: and Qaarsut (Fig. 22). Its wider di
Page 71 and 72: Fig. 52. Two closely spaced section
Page 73 and 74: Type section. The type section of t
Page 75 and 76: Fig. 56. Delta front succession of
Page 77 and 78: Fig. 59. The Kingittoq Member at Ki
Page 79 and 80: sh L sh ch delta front Vaigat Forma
Page 81 and 82: Fig. 63. Type locality of the Itivn
Page 83 and 84: 782 Quaternary cover 54° 888 Malig
Page 85: Kuugannguaq-Qunnilik Fault and is o
Page 89 and 90: deposited in a base-of-slope and ba
Page 91 and 92: VK 53°30’ 53°15’ Niaqornat Tu
Page 93 and 94: Umiivik-1 m Overburden ★ ★ No p
Page 95 and 96: 76). Heavily bioturbated interbedde
Page 97 and 98: Fig. 78. Type locality of the Kussi
Page 99 and 100: A B Itilli Formation Kussinerujuk M
Page 101 and 102: 160 140 120 100 Vaigat Formation Eq
Page 103 and 104: Fig. 85. Mudstones and conglomerati
Page 105 and 106: Fig. 87. Type section of the Kangil
Page 107 and 108: m 150 140 130 120 110 100 90 Kangil
Page 109 and 110: channellised, high-density currents
Page 111 and 112: Thickness. The Annertuneq Conglomer
Page 113 and 114: Fig. 96. A: Type locality of the Oy
Page 115 and 116: On Svartenhuk Halvø, on the east s
Page 117 and 118: Fig. 100. Reference locality of the
Page 119 and 120: Tupaasat Member Atane Formation Fig
Page 121 and 122: ever, have a fluvio-lacustrine orig
Page 123 and 124: etween Tupaasat and Nuuk Qiterleq a
Page 125 and 126: Vaigat Formation sill Quikavsak For
Page 127 and 128: Fig. 112. The sharp boundary betwee
Page 129 and 130: Agatdal Formation Eqalulik Formatio
Page 131 and 132: Fig. 116. Basal conglomerate unit o
Page 133 and 134: heterolithic deposits of the Kangil
Page 135 and 136: GANE#1 Vaigat Fm Anaanaa Mb m Hyalo
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Fig. 121. Well reference section of
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Pedersen 1978). The beds are usuall
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In detail, however, the boundary be
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Fig. 126. Composite type section of
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m m 240 340 m Pingu Member 230 230
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Naujât Member Atane Formation, Kin
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The TOC [Total Organic Carbon] cont
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Fig. 133. Correlation of the member
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Fig. 135. Type locality of the Ping
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Fig. 137. Lower, sharp boundary of
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m 130 125 110 t t invasive lava low
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Fig. 141. Upper part of the Assoq M
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Brown, R. 1875: Geological notes on
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a rosetted spreite trace fossil: Da
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ing bark from the Nûgssuaq peninsu
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1998: The syn-volcanic Naajaat lake
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Appendix: Place names and localitie
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Place name Place name P Paatuut sou
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Geological Survey of Denmark and Greenland Bulletin 19 ... - Geus

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