The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20
Thick successions of marine Middle Jurassic deposits rich in ammonites occur in the Jameson Land Basin in central East Greenland. The fauna of the so-called Cranocephalites beds of this basin, comprising the Borealis–Pompeckji Standard Zones, was until now largely represented by a single collection....
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Geological Survey of Denmark and Greenland
2015
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ftdoajarticles:oai:doaj.org/article:4eda3d5ac8624908a1c9955bd8aafee4 2023-05-15T16:03:37+02:00 The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 J.H. Collomon P. Alsen F. Surlyk 2015-12-01T00:00:00Z https://doaj.org/article/4eda3d5ac8624908a1c9955bd8aafee4 EN eng Geological Survey of Denmark and Greenland http://www.geus.dk/DK/publications/geol-survey-dk-gl-bull/34/Documents/nr34_plates_1-20.pdf https://doaj.org/toc/1604-8156 https://doaj.org/toc/1904-4666 1604-8156 1904-4666 https://doaj.org/article/4eda3d5ac8624908a1c9955bd8aafee4 Geological Survey of Denmark and Greenland Bulletin, Vol 34, Pp 087-128 (2015) Biostratigraphy MiddleJurassic Jameson Land Basin Boreal Realm Bajocian Borealis Zone Indistinctus Zone Pompeckji Zone Intermissus Subzone Carlsbergensis Subzone Gracilis Subzone Episcopalis Subzone Cranocephalites carolae sp. nov Cranocephalites intermissus sp. nov Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2015 ftdoajarticles 2022-12-31T08:46:55Z Thick successions of marine Middle Jurassic deposits rich in ammonites occur in the Jameson Land Basin in central East Greenland. The fauna of the so-called Cranocephalites beds of this basin, comprising the Borealis–Pompeckji Standard Zones, was until now largely represented by a single collection. This was made by T.M. Harris during a 1927 excursion up the valley of Ugleelv to Katedralen, the type area of Cranocephalites pompeckji, which is the oldest named species of this genus. Revisits to this area in 1994 and 1996 by JHC resulted in a large bed-by-bed collection of Cranocephalites. The number of faunal horizons that could be distinguished grew from the nine previously recognised to thirty-four today. The zonal stratigraphy of the Cranocephalites beds encompasses the Borealis, Indistinctus and Pompeckji Standard Zones. The Pompeckji Zone is subdivided into four new subzones, reflecting four successive basic morphologies of Cranocephalites that should be recognisable more widely and are thus useful for subzonal correlations. The detailed zonation that serves as the secondary standard zonation for the Boreal Province in the Middle Jurassic is thus highly improved. The biostratigraphic resolution obtained here is near the achievable limits. It allows a high-resolution study of the evolution of the ammonites which on this timescale appears to be continuous. Three new species are described: Cranocephalites carolae sp. nov., Cranocephalites intermissus sp. nov. and Cranocephalites episcopalis sp. nov. An additional new species, Cranocephalites tvaerdalensis sp. nov., is described in the appendix by P. Alsen based on collections from Tværdal on Geographical Society Ø, North-East Greenland. This species is also recorded in Jameson Land. Article in Journal/Newspaper East Greenland Greenland Geological Survey of Denmark and Greenland Bulletin Directory of Open Access Journals: DOAJ Articles Geographical Society Ø ENVELOPE(-23.250,-23.250,72.950,72.950) Greenland Jameson Land ENVELOPE(-23.500,-23.500,71.167,71.167) Katedralen ENVELOPE(-22.967,-22.967,70.883,70.883) Ugleelv ENVELOPE(-22.683,-22.683,70.783,70.783) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Biostratigraphy MiddleJurassic Jameson Land Basin Boreal Realm Bajocian Borealis Zone Indistinctus Zone Pompeckji Zone Intermissus Subzone Carlsbergensis Subzone Gracilis Subzone Episcopalis Subzone Cranocephalites carolae sp. nov Cranocephalites intermissus sp. nov Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Biostratigraphy MiddleJurassic Jameson Land Basin Boreal Realm Bajocian Borealis Zone Indistinctus Zone Pompeckji Zone Intermissus Subzone Carlsbergensis Subzone Gracilis Subzone Episcopalis Subzone Cranocephalites carolae sp. nov Cranocephalites intermissus sp. nov Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 J.H. Collomon P. Alsen F. Surlyk The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
topic_facet |
Biostratigraphy MiddleJurassic Jameson Land Basin Boreal Realm Bajocian Borealis Zone Indistinctus Zone Pompeckji Zone Intermissus Subzone Carlsbergensis Subzone Gracilis Subzone Episcopalis Subzone Cranocephalites carolae sp. nov Cranocephalites intermissus sp. nov Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
Thick successions of marine Middle Jurassic deposits rich in ammonites occur in the Jameson Land Basin in central East Greenland. The fauna of the so-called Cranocephalites beds of this basin, comprising the Borealis–Pompeckji Standard Zones, was until now largely represented by a single collection. This was made by T.M. Harris during a 1927 excursion up the valley of Ugleelv to Katedralen, the type area of Cranocephalites pompeckji, which is the oldest named species of this genus. Revisits to this area in 1994 and 1996 by JHC resulted in a large bed-by-bed collection of Cranocephalites. The number of faunal horizons that could be distinguished grew from the nine previously recognised to thirty-four today. The zonal stratigraphy of the Cranocephalites beds encompasses the Borealis, Indistinctus and Pompeckji Standard Zones. The Pompeckji Zone is subdivided into four new subzones, reflecting four successive basic morphologies of Cranocephalites that should be recognisable more widely and are thus useful for subzonal correlations. The detailed zonation that serves as the secondary standard zonation for the Boreal Province in the Middle Jurassic is thus highly improved. The biostratigraphic resolution obtained here is near the achievable limits. It allows a high-resolution study of the evolution of the ammonites which on this timescale appears to be continuous. Three new species are described: Cranocephalites carolae sp. nov., Cranocephalites intermissus sp. nov. and Cranocephalites episcopalis sp. nov. An additional new species, Cranocephalites tvaerdalensis sp. nov., is described in the appendix by P. Alsen based on collections from Tværdal on Geographical Society Ø, North-East Greenland. This species is also recorded in Jameson Land. |
format |
Article in Journal/Newspaper |
author |
J.H. Collomon P. Alsen F. Surlyk |
author_facet |
J.H. Collomon P. Alsen F. Surlyk |
author_sort |
J.H. Collomon |
title |
The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
title_short |
The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
title_full |
The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
title_fullStr |
The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
title_full_unstemmed |
The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland, Plates 1-20 |
title_sort |
ammonites of the middle jurassic cranocephalites beds of east greenland, plates 1-20 |
publisher |
Geological Survey of Denmark and Greenland |
publishDate |
2015 |
url |
https://doaj.org/article/4eda3d5ac8624908a1c9955bd8aafee4 |
long_lat |
ENVELOPE(-23.250,-23.250,72.950,72.950) ENVELOPE(-23.500,-23.500,71.167,71.167) ENVELOPE(-22.967,-22.967,70.883,70.883) ENVELOPE(-22.683,-22.683,70.783,70.783) |
geographic |
Geographical Society Ø Greenland Jameson Land Katedralen Ugleelv |
geographic_facet |
Geographical Society Ø Greenland Jameson Land Katedralen Ugleelv |
genre |
East Greenland Greenland Geological Survey of Denmark and Greenland Bulletin |
genre_facet |
East Greenland Greenland Geological Survey of Denmark and Greenland Bulletin |
op_source |
Geological Survey of Denmark and Greenland Bulletin, Vol 34, Pp 087-128 (2015) |
op_relation |
http://www.geus.dk/DK/publications/geol-survey-dk-gl-bull/34/Documents/nr34_plates_1-20.pdf https://doaj.org/toc/1604-8156 https://doaj.org/toc/1904-4666 1604-8156 1904-4666 https://doaj.org/article/4eda3d5ac8624908a1c9955bd8aafee4 |
_version_ |
1766399306224369664 |