GEUS Bulletin no 5.pmd

More documents

Recommendations

Info

Metre 25 0 Store Koldewey Kløft II Sample height 18.00 11.00 4.00 3.00 1.00 GGU sample no. 360495 360494 360493 360496 360497 System Jurassic Stage Kimmeridgian Oxfordian–Kimmeridgian Formation Bernbjerg Payer Dal 1 Rhynchodiniopsis cladophora 2 Pilosidinium myriatrichum 3 Nummus spp. 4 Adnatosphaeridium sp. 5 Ambonosphaera calloviana 6 Paragonyaulacysta capillosa 7 Leptodinium subtile 8 Sentusidinium pelionense 9 Gonyaulacysta cf. helicoidea 10 Leiosphaeridia spp. 11 Epiplosphaera spp. 12 Gonyaulacysta dualis 13 Cribroperidinium granuligera 14 Pareodinia halosa 15 Tenua hystrix 16 Chytroeisphaeridia hyalina 17 Epiplosphaera bireticulata 18 Circulodinium spp. 19 Escharispahaeria laevigata 20 Caddosphaera cf. halosa 21 Occisucysta aff. monoheuriskos 22 Taeniophora iunctispina 23 Ambonosphaera sp. 24 Sirmiodinium grossii 25 Pareodinia spp. 26 Scriniodinium irregulare 27 Atopodinium haromense 28 Perisseiasphaeridium pannosum 29 Avellodinium cf. falsificum 30 Escharisphaeridia pocockii 31 Rhynchodiniopsis spp. 32 Rhynchodiniopsis cf. pennata 33 Occissucysta spp. 34 Barbatacysta pilosa 35 Prolixosphaeridium granulosum 36 Escharispahaeria cf. laevigata 37 Tubotuberella cf. egemenii 38 Tenua spp. 39 Circulodinium downiei 40 Circulodinium cf. downiei 41 Paragonyaulacysta cf. capillosa 42 Oligosphaeridium patulum 43 Apteodinium spp. 44 Cribroperidinium cf. perforans 45 Pareodinia borealis 46 Perisseiasphaeridium cf. pannosum 47 Acritarch Species Fig. 7. Distribution chart of the dinoflagellate cysts in the Upper Jurassic succession at Kløft II on Store Koldewey. >50 specimens 20–50 specimens 5–19 specimens 1–4 specimens ALPHABETICAL SPECIES LIST 23 Ambonosphaera sp. 47 Acritarch species 4 Adnatosphaeridium sp. 5 Ambonosphaera calloviana 43 Apteodinium spp. 27 Atopodinium haromense 29 Avellodinium cf. falsificum 34 Barbatacysta pilosa 20 Caddosphaera cf. halosa 16 Chytroeisphaeridia hyalina 40 Circulodinium cf. downiei 39 Circulodinium downiei 18 Circulodinium spp. 44 Cribroperidinium cf. perforans 13 Cribroperidinium granuligera 17 Epiplosphaera bireticulata 11 Epiplosphaera spp. 36 Escharispahaeria cf. laevigata 19 Escharispahaeria laevigata 30 Escharisphaeridia pocockii 9 Gonyaulacysta cf. helicoidea 12 Gonyaulacysta dualis 10 Leiosphaeridia spp. 7 Leptodinium subtile 3 Nummus spp. 33 Occisucysta spp. 21 Occisucysta aff. monoheuriskos 42 Oligosphaeridium patulum 45 Pareodinia borealis 6 Paragonyaulacysta capilosa 41 Paragonyaulacysta cf. capilosa 14 Pareodinia halosa 25 Pareodinia spp. 46 Perisseiasphaeridium cf. pannosum 28 Perisseiasphaeridium pannosum 2 Pilosidinium myriatrichum 35 Prolixosphaeridium granulosum 32 Rhynchodiniopsis cf. pennata 1 Rhynchodiniopsis cladophora 31 Rhynchodiniopsis spp. 26 Scriniodinium irregulare 8 Sentusidinium pelionense 24 Sirmiodinium grossii 22 Taeniophora iunctispina 15 Tenua hystrix 38 Tenua spp. 37 Tubotuberella cf. egemenii 108 GEUS Bulletin no 5.pmd 108 29-10-2004, 11:14
Chronozone) to the earliest Kimmeridgian (Pictonia baylei and R. cymodoce Chronozones). A similar order of appearances occurs in the Upper Jurassic succession of Store Koldewey and the presence of Occisucysta sp. in these strata also supports a stratigraphical level equivalent to the R. cymodoce Chronozone by comparison with the assemblages from Milne Land. P. pannosum becomes abundant in Milne Land in the A. mutabilis Chronozone and dominates the dinoflagellate assemblages throughout the A. eudoxus Zone until Oligosphaeridium patulum becomes the totally dominant species in the A. autissiodorensis Chronozone. The assemblage on Store Koldewey contains Perisseiasphaeridium pannosum most abundantly at the transition between the two formations and Oligosphaeridium patulum follows rapidly at the base of Bernbjerg Formation. None of the two species are abundant at higher levels in the Bernbjerg Formation at Kløft II. Upper Jurassic correlation The Upper Jurassic dinoflagellate cyst assemblages on Store Koldewey closely resemble the Boreal assemblages from the Jurassic Ladegårdsåen Formation of Peary Land (Piasecki 1994), and to some degree also the assemblage in the Janusfjellet Formation, Svalbard (Århus 1988). However, the restricted ammonite faunas in these two formations do not allow precise dating of the dinoflagellate assemblages on Peary Land and Svalbard. The most significant difference between these assemblages is the presence of P. pannosum and O. patulum only at Store Koldewey. Adnatosphaeridium sp. and Taeniophora iunctispina occur as far north as Peary Land but are not reported from Svalbard. The stratigraphically highest occurrence of Gonyaulacysta dualis, Atopodinium haromense, Occisucysta sp. in Peary Land, in an assemblage with abundant Escharisphaeridium pocockii, Rhynchodiniopsis sp., Taeniophora iunctispina and Adnatosphaeridium sp. is associated with the appearance of Paragonyaulacysta capillosa and Cribroperidinium perforans. This assemblage and associated stratigraphic events in Peary Land are directly comparable with the dinoflagellate cyst assemblage at the transition from the Payer Dal Formation to the Bernbjerg Formation on Store Koldewey. The age of this assemblage is interpreted to be Early Kimmeridgian (R. cymodoce – A. mutabilis Chronozones). A comparable event has not been recorded in the Kimmeridgian of Svalbard (Janusfjellet Formation) where only Paragonyaulacysta capillosa seems to have stratigraphical potential, with a consistently relative short range (Århus 1988). There, P. capillosa appears after a poor to barren interval in the Upper Oxfordian to lowermost Kimmeridgian, above a poor ammonite record of Rasenia sp. and at a level where bioturbated mudstones are followed by laminated mudstones, just as on Store Koldewey and in Milne Land. The appearance of P. capillosa and its associated assemblage may therefore reflect a relative sea-level rise. The presence of P. capillosa and its associated dinoflagellate cyst assemblage may be used as a general indication of the stratigraphical level from the R. cymodoce Chronozone into the A. mutabilis (A. eudoxus?) Chronozone. The few other associated species in the Janusfjellet section are the stratigraphically long-ranging species Paragonyaulacysta borealis, Lanterna saturnalis and Tubotuberella apatela, the typical Borealis Assemblage (Brideaux & Fisher 1976) which also occurs in East and North Greenland. The dinoflagellate cyst assemblages in Peary Land and Svalbard provide no clear upper stratigraphical limits, except for the disappearance of P. capillosa. P. capillosa occurs commonly up to the A. autissiodorensis Chronozone (top Kimmeridgian) in Milne Land but is also recorded scattered throughout the Volgian. The successions at Store Koldewey, Peary Land and Svalbard within the range of abundant P. capillosa are therefore considered to be of Kimmeridgian (pre-Volgian) age. Discussion GEUS Bulletin no 5.pmd 109 29-10-2004, 11:14 Despite the similarity in composition and abundance of specific species in the geographically widespread assemblages described above, there are also clear differences reflecting the latitudinal distance between the compared localities. The Upper Jurassic dinoflagellate cyst assemblage on Store Koldewey is a mixture of species with Subboreal or Boreal preference but with a clear affinity to the Boreal region. P. pannosum and O. patulum are abundant and long-ranging in Northwest Europe, they are abundant with a more restricted stratigraphical range in East Greenland, and they appear in low numbers with a limited stratigraphical range in Store Koldewey. This is probably close to the northern limit of these species as they do not appear farther to the north in Peary Land (Piasecki 1994) and Svalbard (Århus 1988). On Store Koldewey, the occurrence of these species so far north is associated with the most 109
Page 1 and 2:
GEOLOGICAL SURVEY OF DENMARK AND GR
Page 3 and 4:
GEUS Bulletin no 5.pmd 3 29-10-2004
Page 5 and 6:
Contents Preface . . . . . . . . .
Page 7 and 8:
(Alsen & Surlyk 2004, this volume).
Page 9 and 10:
Jurassic syn-rift sedimentation on
Page 11 and 12:
NW SE m 1000 500 0 NW SE m 1000 500
Page 13 and 14:
Page 15 and 16:
grained than the lower parasequence
Page 17 and 18:
the Pelion Formation. The mudstone-
Page 19 and 20:
The fluviatile Bristol Elv Formatio
Page 21 and 22:
Name. After the river Bristol Elv i
Page 23 and 24:
edded, and display both sheet-like
Page 25 and 26:
N S Fig. 5. Coarse-grained sandston
Page 27 and 28:
Fig. 7. Lacustrine deposits from th
Page 29 and 30:
deposition of peat and coal. Journa
Page 31 and 32:
Maximum Middle Jurassic transgressi
Page 33 and 34:
834 N Lycett Bjerg Barrikade Gletsc
Page 35 and 36:
SW NE Lycett Bjerg Parnas Member Be
Page 37 and 38:
Cadoceras cf. nordenskjoeldi Callom
Page 39 and 40:
Page 41 and 42:
4 C B 1 2 GEUS Bulletin no 5.pmd 41
Page 43 and 44:
Fig. 1. Sketch-map of the Jameson L
Page 45 and 46:
Table 1. Measurement of dimensions
Page 47 and 48:
Page 49 and 50:
1 2 GEUS Bulletin no 5.pmd 49 29-10
Page 51 and 52:
A new Middle-Upper Jurassic success
Page 53 and 54:
74º00'N ■■ ■■ ■■ 73º5
Page 55 and 56:
System Ma 159.4 154.1 164.4 169.2 1
Page 57 and 58: Sedimentary structures Biota Struct
Page 59 and 60: wards units is biogenic carbonate d
Page 61 and 62: Fig. 7. Log panel giving a broadly
Page 63 and 64: SPM LU to medium-grained and consis
Page 65 and 66: and mudstone drapes reflects varyin
Page 67 and 68: with the presence of a minor angula
Page 69 and 70: the north-east and south-west, resp
Page 71 and 72: elly mass-flow deposits. In: Koster
Page 73 and 74: Jurassic dinoflagellate cyst strati
Page 75 and 76: 74°00'N ■■ ■■ ■■ 73°5
Page 77 and 78: Bernbjerg Formation Payer Dal Forma
Page 79 and 80: Depositional environment. The prese
Page 81 and 82: GEUS Bulletin no 5.pmd 81 29-10-200
Page 85 and 86: Metres 30 20 10 Hold with Hope, Loc
Page 87 and 88: Correlations The Pelion Formation o
Page 89 and 90: Jurassic dinoflagellate cysts from
Page 91 and 92: Fig. 2. Sedimentological log of the
Page 93 and 94: LITHOSTRATIGRAPHY BIOSTRATIGRAPHY F
Page 95 and 96: ALPHABETICAL SPECIES LIST 41 Adnato
Page 97 and 98: References Alsgaard, P.C., Felt, V.
Page 99 and 100: Jurassic dinoflagellate cyst strati
Page 101 and 102: parties from the Geological Survey
Page 103 and 104: may indicate a hiatus in the sedime
Page 105 and 106: Metre 50 25 0 Store Koldewey Ravn P
Page 107: Fig. 6. Schematic stratigraphical c
Page 111 and 112: The Upper Jurassic succession is co
Page 115 and 116: 185 Greenland from Archaean to Quat
show all

GEUS Bulletin no 5.pmd

Create successful ePaper yourself

Delete template?

Save as template?