New species of the genus Parkiella (Foraminifera) from the Late Cretaceous Central Pacific Ocean; biostratigraphy, biogeography, and the Cretaceous-Palaeogene boundary

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doi: 10.1144/jm.17.1.51
Author(s): Widmark, Joen G. V.; Kucera, Michal
Author Affiliation(s): Primary:
Göteborg University, Department of Marine Geology, Goteborg, Sweden
Volume Title: Journal of Micropalaeontology
Source: Journal of Micropalaeontology, Vol.17(Part 1), p.51-60. Publisher: British Micropalaeontological Society, London, United Kingdom. ISSN: 0262-821X
Note: In English. 26 refs.; illus., incl. 1 plate, 4 tables, sects.
Summary: Two new species, Parkiella angulocamerata sp. nov. and P. globocamerata sp. nov., are described from the Late Cretaceous (late Maastrichtian) Central Pacific Ocean, DSDP Sites 465 and 171. Examination under the SEM revealed apertural features that were not documented in the original description of Parkiella. An "L"-shaped aperture was originally considered as a diagnostic character of Parkiella: we suggest that this is a preservational artefact and question its diagnostic value. The existence of internal toothplates determine both Parkiella described here as members of the family Turrilinidae Cushman 1927. Both species were found to be endemic to the tropical Pacific Ocean. They occurred in sequence throughout the Maastrichtian section at Site 465 with a minimum (one sample) stratigraphic overlap. Parkiella globocamerata is one of the few deep-sea benthic foraminiferal species that indeed became extinct at the Cretaceous Palaeogene (K/Pg) boundary. However, we document a decrease in both relative abundance and accumulation rate of the species already prior to the K Pg transition. We propose that the interval between the LO (Last Occurrence) of P. angulocamerata and the LO of P. globocamerata is indicative of uppermost Cretaceous (Micula prinsii Zone) strata in the tropical Pacific.
Year of Publication: 1998
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Assemblages; Biogeography; Biostratigraphy; Cenozoic; Central Pacific; Cretaceous; DSDP Site 171; DSDP Site 465; Deep Sea Drilling Project; Foraminifera; IPOD; Invertebrata; K-T boundary; Leg 17; Leg 62; Lower Paleocene; Mesozoic; Microfossils; Morphology; New taxa; Pacific Ocean; Paleocene; Paleogene; Parkiella; Parkiella angulocamerata; Parkiella globocamerata; Protista; Quantitative analysis; Statistical analysis; Stratigraphic boundary; Taxonomy; Tertiary; Upper Cretaceous
Coordinates: N190754 N190754 W1692736 W1692736
N334914 N334914 E1785508 E1785508
Record ID: 1998060190
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