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

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Annertuneq Conglomerate Member Fig. 95. Upper boundary (dashed line) of the Annertuneq Conglomerate Member of the Kangilia Formation at Kangilia showing a gradual transition from conglomerates and sandstones to mudstones. For location, see Fig. 74; person for scale. age (J.M. Hansen 1980b; Nøhr-Hansen 1996, 1997b; Dam et al. 1998c; Nøhr-Hansen et al. 2002). The mudstones of the remaining Kangilia Formation (above) are of late Maastrichtian – Paleocene age. The position of the Maastrichtian–Paleocene boundary within the Kang - ilia Formation varies between localities, from 210 m above the base of the Annertuneq Conglomerate Member (Nøhr-Hansen & Dam 1997), c. 70 m above the base of the member at Kangilia (Fig. 87), to a position close to the top of the member in the GANT#1 well (Nøhr- Hansen 1997b). This suggests an ?early to late Maa - strichtian age for the member. Oyster–Ammonite Conglomerate Bed new bed History. In Agatdalen on central Nuussuaq, a conglomerate of Danian age containing a huge number of derived concretions has been referred to as the Oyster-Ammonite Conglomerate (e.g. Birkelund 1965). H.J. Hansen (1970) referred this conglomerate to the Thyasira Member of Rosenkrantz (1970). For historical reasons and in order to distinguish this fossiliferous conglomerate unit from the Annertuneq Conglomerate Member, it is now formally established as a bed and named the Oyster –Ammo - nite Conglomerate Bed. Name. The bed is named after the rich occurrence of reworked oysters and ammonites in the conglomerate. Distribution. The bed has only been described from three localities in Agatdalen (Fig. 113). Type locality. The bed is best exposed in the western river bank of the Agatdalen river, south-east of Sill Sø (Figs 96, 113). The type locality is located at 70°34.62´N, 53°04.50´W. Thickness. The bed is approximately 5 m thick (Rosen - krantz 1970). 112
Fig. 96. A: Type locality of the Oyster– Ammonite Conglomerate Bed on the western bank of the Agatdalen river. For location, see Fig. 113. B: Clast in the polymodal, matrix-supported conglomerate (paraconglomerate) in the Oyster– Ammonite Conglomerate Bed. Hammer (encircled) for scale. A See B 4 m B Lithology. The Oyster–Ammonite Conglomerate Bed is a clast-supported conglomerate dominated by numerous, calcareous concretions and dark mudstone boulders eroded from Maastrichtian and Campanian deposits (Fig. 96; H.J. Hansen 1970). The matrix consists of sandy mudstone containing Danian oysters and bivalves (see below). In places, calcareous concretions have been formed within the conglomerate (Floris 1972). Fossils. The fossils in the concretions are reworked and include ammonites, oysters and other bivalves, gastropods, crustaceans and corals (Birkelund 1965; Rosenkrantz 1970; Floris 1972). They show that the concretions were eroded from Maastrichtian deposits and represent a rich fauna including Hypophylloceras (Neophylloceras) groenlandicum Birkelund 1965, Saghalinites wrighti Birkelund 1965, Baculites cf. B. meeki Elias 1933, Scaphites (Disco - scaphites) waagei Birkelund 1965, and S. (D.) angmartussutensis Birkelund 1965 (Hoploscaphites Nowak 1911 according to Kennedy et al. 1999). In addition Scaphites (Hoploscaphites) cf. S. (H.) ravni Birkelund 1965, S. (H.) cf. S. (H.) greenlandicus Donovan 1953, S. cobbani Birkelund 1965 and S. rosenkrantzi Birkelund 1965 occur very occasionally and indicate that some concretions were derived from the Campanian (Kennedy et al. 1999). Corals include Stephanocyathus sp. and Caryophyllia agatdalensis (Floris 1972). The mudstone matrix includes oysters and other bivalves that have also been described from the lower part of the overlying Eqalulik Formation on the north coast of Nuussuaq (Thyasira Member of Rosenkrantz (1970)). Dinocysts are present in both the reworked concretions and the matrix of the conglomerate. Depositional environment. Deposition took place from debris flow(s) in a marine environment. Boundaries. The lower and upper boundaries of the bed are not well exposed. The lower boundary is inferred to be an erosional unconformity separating the conglomerate from underlying mudstones of the Campanian Itilli 113
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GEOLOGICAL SURVEY OF DENMARK AND GR
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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
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volcanic sediments are referred to
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Fig. 20. View from Uummannaq toward
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In the Kuuk area, the sediments ove
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m m 15 14 14 13 12 11 10 9 8 7 6 5
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Kome Formation m 40 30 20 D tial re
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Fig. 28. Reference locality of the
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Vaigat Fm Vesterfjeld Slibestensfje
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Gilbert delta in the Ikorfat area (
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150 300 450 100 250 400 m 550 50 20
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Fig. 36. Outcrop of the Upernivik N
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Correlation. The Upernivik Næs flo
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12’ 09’ 15’ 06’ 03’ Saqqa
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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 and 86: Kuugannguaq-Qunnilik Fault and is o
Page 87 and 88: and include clasts of intraformatio
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: Thickness. The Annertuneq Conglomer
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
Page 137 and 138: Fig. 121. Well reference section of
Page 139 and 140: Pedersen 1978). The beds are usuall
Page 141 and 142: In detail, however, the boundary be
Page 143 and 144: Fig. 126. Composite type section of
Page 145 and 146: m m 240 340 m Pingu Member 230 230
Page 147 and 148: Naujât Member Atane Formation, Kin
Page 149 and 150: The TOC [Total Organic Carbon] cont
Page 151 and 152: Fig. 133. Correlation of the member
Page 153 and 154: Fig. 135. Type locality of the Ping
Page 155 and 156: Fig. 137. Lower, sharp boundary of
Page 157 and 158: m 130 125 110 t t invasive lava low
Page 159 and 160: Fig. 141. Upper part of the Assoq M
Page 161 and 162: 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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