Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway
Erratic blocks occurring on the shore at Sortland, northern Norway, consists of fine-to coarse-grained siliclastics, in places conglomeratic, which exhibit signs of large-scale cross-bedding or, less commonly, are bioturbated. The blocks contain either abundant plant debris (which indicate fluvial e...
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ftnorgesgu:oai:openarchive.ngu.no:11250/2674111 2023-05-15T15:09:49+02:00 Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway Fürsich, Franz Theodor Thomsen, Elsebeth 12323 Sortland 12321 Kvæfjord 2005 application/pdf https://hdl.handle.net/11250/2674111 eng eng NGU Bulletin (443) urn:issn:03332-5768 https://hdl.handle.net/11250/2674111 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 37-53 JURA BIOSTRATIGRAFI FACIES Journal article 2005 ftnorgesgu 2022-07-03T15:27:00Z Erratic blocks occurring on the shore at Sortland, northern Norway, consists of fine-to coarse-grained siliclastics, in places conglomeratic, which exhibit signs of large-scale cross-bedding or, less commonly, are bioturbated. The blocks contain either abundant plant debris (which indicate fluvial environments or at least a strong terrestrial influence) or shells and shell debris of a variety of marine benthic organisms. Most common are bivalves, followed by serpulids, gastropods, brachipods and echinoid spines. Belemnites constitute the only nektic element. The benthic fauna occurs scattered, as shell pavements, or in small lenes. Altogether 39 taxa were identified, and one of them (Lopatinia (Paralopatinia) sortlandensis sp. nov) is new. The remaining taxa are typical elements of boreal faunas elsewhere (e.g., East Greenland, northern Russia) and suggest av Volgian age of most, if not all, of the boulders with shelly remains at Sortland. This age is supported by 87Sr\/86Sr isotope ratios of oyster shells. The benthic fauna is grouped into eight assemblages, nearly all of them exhibiting signs of reworking and\/or transport. Together with their sediments they form characteristic biofacies. These represent environments ranging from shallow-water, high-energy, nearshore areas above the fair-weather wave-base to offshore, quieter environments. Most likely, deposition took place in a fault-controlled coastal area, on tilted fault blocks, and thus mirrors the situation on the opposite (western) margin of the Arctic Seaway in the Late Jurassic. 51859 Article in Journal/Newspaper Arctic East Greenland Greenland Kvæfjord Northern Norway Vesterålen NGU Open Archive (Geological Survey of Norway) Arctic Greenland Jura ENVELOPE(13.501,13.501,68.062,68.062) Kvæfjord ENVELOPE(16.184,16.184,68.772,68.772) Lenes ENVELOPE(9.007,9.007,63.259,63.259) Norway Sortland ENVELOPE(13.595,13.595,68.245,68.245) Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
JURA BIOSTRATIGRAFI FACIES |
spellingShingle |
JURA BIOSTRATIGRAFI FACIES Fürsich, Franz Theodor Thomsen, Elsebeth Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
topic_facet |
JURA BIOSTRATIGRAFI FACIES |
description |
Erratic blocks occurring on the shore at Sortland, northern Norway, consists of fine-to coarse-grained siliclastics, in places conglomeratic, which exhibit signs of large-scale cross-bedding or, less commonly, are bioturbated. The blocks contain either abundant plant debris (which indicate fluvial environments or at least a strong terrestrial influence) or shells and shell debris of a variety of marine benthic organisms. Most common are bivalves, followed by serpulids, gastropods, brachipods and echinoid spines. Belemnites constitute the only nektic element. The benthic fauna occurs scattered, as shell pavements, or in small lenes. Altogether 39 taxa were identified, and one of them (Lopatinia (Paralopatinia) sortlandensis sp. nov) is new. The remaining taxa are typical elements of boreal faunas elsewhere (e.g., East Greenland, northern Russia) and suggest av Volgian age of most, if not all, of the boulders with shelly remains at Sortland. This age is supported by 87Sr\/86Sr isotope ratios of oyster shells. The benthic fauna is grouped into eight assemblages, nearly all of them exhibiting signs of reworking and\/or transport. Together with their sediments they form characteristic biofacies. These represent environments ranging from shallow-water, high-energy, nearshore areas above the fair-weather wave-base to offshore, quieter environments. Most likely, deposition took place in a fault-controlled coastal area, on tilted fault blocks, and thus mirrors the situation on the opposite (western) margin of the Arctic Seaway in the Late Jurassic. 51859 |
format |
Article in Journal/Newspaper |
author |
Fürsich, Franz Theodor Thomsen, Elsebeth |
author_facet |
Fürsich, Franz Theodor Thomsen, Elsebeth |
author_sort |
Fürsich, Franz Theodor |
title |
Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
title_short |
Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
title_full |
Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
title_fullStr |
Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
title_full_unstemmed |
Jurassic biota and biofacies in erratics from the Sortland area, Vesterålen, northern Norway |
title_sort |
jurassic biota and biofacies in erratics from the sortland area, vesterålen, northern norway |
publishDate |
2005 |
url |
https://hdl.handle.net/11250/2674111 |
op_coverage |
12323 Sortland 12321 Kvæfjord |
long_lat |
ENVELOPE(13.501,13.501,68.062,68.062) ENVELOPE(16.184,16.184,68.772,68.772) ENVELOPE(9.007,9.007,63.259,63.259) ENVELOPE(13.595,13.595,68.245,68.245) ENVELOPE(14.939,14.939,68.754,68.754) |
geographic |
Arctic Greenland Jura Kvæfjord Lenes Norway Sortland Vesterålen |
geographic_facet |
Arctic Greenland Jura Kvæfjord Lenes Norway Sortland Vesterålen |
genre |
Arctic East Greenland Greenland Kvæfjord Northern Norway Vesterålen |
genre_facet |
Arctic East Greenland Greenland Kvæfjord Northern Norway Vesterålen |
op_source |
37-53 |
op_relation |
NGU Bulletin (443) urn:issn:03332-5768 https://hdl.handle.net/11250/2674111 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
_version_ |
1766340933442338816 |