Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean
The morphological variability (coiling properties, size and shape) of the planktic foraminifer Contusortuncana contusa (Cushman) in the terminal Cretaceous ocean was examined at eight deep-sea sites and two continental sections from low (16°) to middle (42°) paleolatitudes in both hemispheres. The m...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.681878 2024-09-15T18:22:47+00:00 Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean Kucera, Michal Malmgren, Bjorn MEDIAN LATITUDE: 12.713733 * MEDIAN LONGITUDE: 49.520218 * SOUTH-BOUND LATITUDE: -29.070700 * WEST-BOUND LONGITUDE: -51.663300 * NORTH-BOUND LATITUDE: 48.915500 * EAST-BOUND LONGITUDE: 178.919000 * DATE/TIME START: 1974-11-16T00:00:00 * DATE/TIME END: 1988-08-05T08:30:00 1996 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.681878 https://doi.org/10.1594/PANGAEA.681878 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.681878 https://doi.org/10.1594/PANGAEA.681878 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Kucera, Michal; Malmgren, Bjorn (1996): Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean. Marine Micropaleontology, 28(1), 31-52, https://doi.org/10.1016/0377-8398(95)00078-X 122-761C 122-762C 39-356 43-384 62-465A 74-525A 74-527 80-548A Caravaca_outcrop Deep Sea Drilling Project DRILL Drilling/drill rig DSDP El-Kef Glomar Challenger Joides Resolution Leg122 Leg39 Leg43 Leg62 Leg74 Leg80 North Atlantic/RIDGE North Atlantic/SPUR North Pacific/CONT RISE Ocean Drilling Program ODP OUTCROP Outcrop sample South Atlantic/CREST South Atlantic/PLATEAU South Atlantic Ocean South Indian Ridge South Indian Ocean Spain Tunesia dataset publication series 1996 ftpangaea https://doi.org/10.1594/PANGAEA.68187810.1016/0377-8398(95)00078-X 2024-08-21T00:02:25Z The morphological variability (coiling properties, size and shape) of the planktic foraminifer Contusortuncana contusa (Cushman) in the terminal Cretaceous ocean was examined at eight deep-sea sites and two continental sections from low (16°) to middle (42°) paleolatitudes in both hemispheres. The material used in this study includes samples from the South Atlantic (DSDP Sites 356, 527 and 525A), North Atlantic (Sites 384 and 548A), Indian and Pacific Oceans (DSDP Site 465A and ODP Sites 761C and 762C) and Tethyan Ocean (outcrop sections from El-Kef and Caravaca). On average 45 specimens from two samples per location were analysed, from an interval corresponding approximately to the last 60 kyr of the Cretaceous. No differences in coiling direction (dextral proportions were > 90% in all samples), percentage of kummerform specimens (usually > 50%) and number of chambers in the last whorl (4-5) were observed between the sites. Both test size (expressed as spiral outline area and test volume) and total number of chambers increase significantly towards lower latitudes. Similarly, test conicity, examined by shape coordinate and eigenshape methods, and angularity of the spiral outline show a rather continuous, slight increase towards lower latitudes. Kummerform specimens of C. contusa were slightly larger and more conical than normalforms and possessed substantially more chambers (both totally and in the last whorl). A principal components analysis of the sample means of five variables describing size and shape clearly distinguished high-latitude sites (525A, 527, 548A, 761C and 762C) from low-latitude sites (384, 465A, Caravaca and El-Kef). Specimens from Site 356 are transitional with respect to those two groups. The results indicate: (1) considerable morphological variation in C. contusa during the terminal Cretaceous comparable to that known in many Recent planktic foraminiferal species and (2) a geographical distribution of this variation corresponding to previously suggested biogeographic schemes based on ... Other/Unknown Material North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-51.663300,178.919000,48.915500,-29.070700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
122-761C 122-762C 39-356 43-384 62-465A 74-525A 74-527 80-548A Caravaca_outcrop Deep Sea Drilling Project DRILL Drilling/drill rig DSDP El-Kef Glomar Challenger Joides Resolution Leg122 Leg39 Leg43 Leg62 Leg74 Leg80 North Atlantic/RIDGE North Atlantic/SPUR North Pacific/CONT RISE Ocean Drilling Program ODP OUTCROP Outcrop sample South Atlantic/CREST South Atlantic/PLATEAU South Atlantic Ocean South Indian Ridge South Indian Ocean Spain Tunesia |
spellingShingle |
122-761C 122-762C 39-356 43-384 62-465A 74-525A 74-527 80-548A Caravaca_outcrop Deep Sea Drilling Project DRILL Drilling/drill rig DSDP El-Kef Glomar Challenger Joides Resolution Leg122 Leg39 Leg43 Leg62 Leg74 Leg80 North Atlantic/RIDGE North Atlantic/SPUR North Pacific/CONT RISE Ocean Drilling Program ODP OUTCROP Outcrop sample South Atlantic/CREST South Atlantic/PLATEAU South Atlantic Ocean South Indian Ridge South Indian Ocean Spain Tunesia Kucera, Michal Malmgren, Bjorn Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
topic_facet |
122-761C 122-762C 39-356 43-384 62-465A 74-525A 74-527 80-548A Caravaca_outcrop Deep Sea Drilling Project DRILL Drilling/drill rig DSDP El-Kef Glomar Challenger Joides Resolution Leg122 Leg39 Leg43 Leg62 Leg74 Leg80 North Atlantic/RIDGE North Atlantic/SPUR North Pacific/CONT RISE Ocean Drilling Program ODP OUTCROP Outcrop sample South Atlantic/CREST South Atlantic/PLATEAU South Atlantic Ocean South Indian Ridge South Indian Ocean Spain Tunesia |
description |
The morphological variability (coiling properties, size and shape) of the planktic foraminifer Contusortuncana contusa (Cushman) in the terminal Cretaceous ocean was examined at eight deep-sea sites and two continental sections from low (16°) to middle (42°) paleolatitudes in both hemispheres. The material used in this study includes samples from the South Atlantic (DSDP Sites 356, 527 and 525A), North Atlantic (Sites 384 and 548A), Indian and Pacific Oceans (DSDP Site 465A and ODP Sites 761C and 762C) and Tethyan Ocean (outcrop sections from El-Kef and Caravaca). On average 45 specimens from two samples per location were analysed, from an interval corresponding approximately to the last 60 kyr of the Cretaceous. No differences in coiling direction (dextral proportions were > 90% in all samples), percentage of kummerform specimens (usually > 50%) and number of chambers in the last whorl (4-5) were observed between the sites. Both test size (expressed as spiral outline area and test volume) and total number of chambers increase significantly towards lower latitudes. Similarly, test conicity, examined by shape coordinate and eigenshape methods, and angularity of the spiral outline show a rather continuous, slight increase towards lower latitudes. Kummerform specimens of C. contusa were slightly larger and more conical than normalforms and possessed substantially more chambers (both totally and in the last whorl). A principal components analysis of the sample means of five variables describing size and shape clearly distinguished high-latitude sites (525A, 527, 548A, 761C and 762C) from low-latitude sites (384, 465A, Caravaca and El-Kef). Specimens from Site 356 are transitional with respect to those two groups. The results indicate: (1) considerable morphological variation in C. contusa during the terminal Cretaceous comparable to that known in many Recent planktic foraminiferal species and (2) a geographical distribution of this variation corresponding to previously suggested biogeographic schemes based on ... |
format |
Other/Unknown Material |
author |
Kucera, Michal Malmgren, Bjorn |
author_facet |
Kucera, Michal Malmgren, Bjorn |
author_sort |
Kucera, Michal |
title |
Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
title_short |
Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
title_full |
Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
title_fullStr |
Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
title_full_unstemmed |
Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean |
title_sort |
latitudinal variation in the planktic foraminifer contusotruncana contusa in the terminal cretaceous ocean |
publisher |
PANGAEA |
publishDate |
1996 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.681878 https://doi.org/10.1594/PANGAEA.681878 |
op_coverage |
MEDIAN LATITUDE: 12.713733 * MEDIAN LONGITUDE: 49.520218 * SOUTH-BOUND LATITUDE: -29.070700 * WEST-BOUND LONGITUDE: -51.663300 * NORTH-BOUND LATITUDE: 48.915500 * EAST-BOUND LONGITUDE: 178.919000 * DATE/TIME START: 1974-11-16T00:00:00 * DATE/TIME END: 1988-08-05T08:30:00 |
long_lat |
ENVELOPE(-51.663300,178.919000,48.915500,-29.070700) |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Kucera, Michal; Malmgren, Bjorn (1996): Latitudinal variation in the planktic foraminifer Contusotruncana contusa in the terminal Cretaceous ocean. Marine Micropaleontology, 28(1), 31-52, https://doi.org/10.1016/0377-8398(95)00078-X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.681878 https://doi.org/10.1594/PANGAEA.681878 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.68187810.1016/0377-8398(95)00078-X |
_version_ |
1810462796552339456 |