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Alegret, Laia; Thomas, Ellen (2005): Relative abundances of benthic foraminifera at the Cretaceous/Paleogene boundary in DSDP Hole 62-465A, Southern Hess Rise in the central North Pacific (Appendix A). PANGAEA, https://doi.org/10.1594/PANGAEA.694032, Supplement to: Alegret, L; Thomas, E (2005): Cretaceous/Paleogene boundary bathyal paleo-environments in the central North Pacific (DSDP Site 465), the Northwestern Atlantic (ODP Site 1049), the Gulf of Mexico and the Tethys: The benthic foraminiferal record. Palaeogeography, Palaeoclimatology, Palaeoecology, 224(1-3), 53-82, https://doi.org/10.1016/j.palaeo.2005.03.031

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Abstract:
Uppermost Maastrichtian benthic foraminiferal assemblages (>63 µm) are diverse, indicating mesotrophic conditions in lower bathyal DSDP Hole 465A (Hess Rise, central North Pacific), in 4 lower bathyal land sections in central-East and Northeastern Mexico, and in the upper to middle bathyal Agost section (Tethys area, Southeastern Spain). They indicate more eutrophic conditions in lower bathyal ODP Hole 1049C (Blake Nose, Northwestern Atlantic). Benthic foraminifers did not suffer significant extinction at the K/Pg boundary, but diversity and heterogeneity of the assemblages and the percentage of infaunal morphogroups decreased drastically in all sections, with the exception of DSDP Hole 465A where the percentage of infaunal taxa increased. These faunal changes probably reflect the effect on the benthic faunas of a widespread decrease in the food supply to the sea floor, as a result of the collapse of primary productivity at the K/Pg boundary. The decrease in food supply apparently affected the benthic faunas least at more eutrophic NW Atlantic ODP Site 1049 and at Pacific DSDP Site 465, which is distal from the impact site of the K/Pg bolide on the Yucatan Peninsula. At these sites the faunas recovered within the Parvulorugoglobigerina eugubina Biozone (~100 ky), although diversity and heterogeneity remained low through the early Danian, possibly indicating environmental stress. This stress might be related to a high or fluctuating food supply by primary producers that could not easily be used by the benthos, such as various bloom species of dinoflagellates. Benthic assemblages recovered more slowly (~300 ky) in the Mexican and Spanish sections. Low oxygen conditions after the K/Pg boundary could be inferred from the benthic assemblages at Agost (Southeastern Spain) only. A short episode of hypoxia, however, may be obscured at Pacific DSDP Hole 465A by drilling disturbance, and in the Mexican sections and Hole 1049C by incomplete sections due to downslope transport. Benthic foraminiferal assemblages thus appear to have been affected by the collapse of primary productivity at the K/Pg boundary to a different extent in different regions, and took different lengths of time for their recovery after the boundary.
Project(s):
Coverage:
Latitude: 33.820500 * Longitude: 178.919000
Date/Time Start: 1978-08-23T00:00:00 * Date/Time End: 1978-08-23T00:00:00
Minimum DEPTH, sediment/rock: 58.65 m * Maximum DEPTH, sediment/rock: 64.94 m
Event(s):
62-465A * Latitude: 33.820500 * Longitude: 178.919000 * Date/Time: 1978-08-23T00:00:00 * Elevation: -2161.0 m * Penetration: 476 m * Recovery: 98.9 m * Location: North Pacific/CONT RISE * Campaign: Leg62 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 408.5 m cored; 9.5 m drilled; 24.2 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Sample code/labelSample labelAlegret, LaiaODP sample designation
3Clavulinoides amorphaC. amorpha%Alegret, LaiaCounting >63 µm fraction
4Clavulinoides trilateraC. trilatera%Alegret, LaiaCounting >63 µm fraction
5Clavulinoides spp.Clavulinoides spp.%Alegret, LaiaCounting >63 µm fraction
6Dorothia pupaD. pupa%Alegret, LaiaCounting >63 µm fraction
7Dorothia spp.Dorothia spp.%Alegret, LaiaCounting >63 µm fraction
8Gaudryina pyramidataG. pyramidata%Alegret, LaiaCounting >63 µm fraction
9Gaudryina spp.Gaudryina spp.%Alegret, LaiaCounting >63 µm fraction
10Marssonella oxyconaM. oxycona%Alegret, LaiaCounting >63 µm fraction
11Marssonella spp.Marssonella spp.%Alegret, LaiaCounting >63 µm fraction
12Spiroplectammina excolataS. excolata%Alegret, LaiaCounting >63 µm fraction
13Spiroplectammina spp.Spiroplectammina spp.%Alegret, LaiaCounting >63 µm fraction
14Spiroplectammina spectabilisS. spectabilis%Alegret, LaiaCounting >63 µm fraction
15Vulvulina sp.Vulvulina sp.%Alegret, LaiaCounting >63 µm fraction
16Alabamina wilcoxensisA. wilcoxensis%Alegret, LaiaCounting >63 µm fraction
17Anomalinoides acutaA. acuta%Alegret, LaiaCounting >63 µm fraction
18Anomalinoides affinisA. affinis%Alegret, LaiaCounting >63 µm fraction
19Anomalinoides ammonoidesA. ammonoides%Alegret, LaiaCounting >63 µm fraction
20Anomalinoides spp.Anomalinoides spp.%Alegret, LaiaCounting >63 µm fraction
21Aragonia sp.Aragonia sp.%Alegret, LaiaCounting >63 µm fraction
22Aragonia velascoensisA. velascoensis%Alegret, LaiaCounting >63 µm fraction
23Bolivinoides decoratusB. decoratus%Alegret, LaiaCounting >63 µm fraction
24Bolivinoides delicatulusB. delicatulus%Alegret, LaiaCounting >63 µm fraction
25Bulimina spp.Bulimina spp.%Alegret, LaiaCounting >63 µm fraction
26Bulimina midwayensisB. midwayensis%Alegret, LaiaCounting >63 µm fraction
27Bulimina ovulaB. ovula%Alegret, LaiaCounting >63 µm fraction
28Bulimina trinitatensisB. trinitatensis%Alegret, LaiaCounting >63 µm fraction
29Bulimina velascoensisB. velascoensis%Alegret, LaiaCounting >63 µm fraction
30Buliminella beaumontiB. beaumonti%Alegret, LaiaCounting >63 µm fraction
31Buliminella spp.Buliminella spp.%Alegret, LaiaCounting >63 µm fraction
32Cibicidoides hyphalusC. hyphalus%Alegret, LaiaCounting >63 µm fraction
33Cibicidoides velascoensisC. velascoensis%Alegret, LaiaCounting >63 µm fraction
34Cibicidoides howelliC. howelli%Alegret, LaiaCounting >63 µm fraction
35Cibicidoides spp.Cibicidoides spp.%Alegret, LaiaCounting >63 µm fraction
36Coryphostoma sp.Coryphostoma sp.%Alegret, LaiaCounting >63 µm fraction
37Ellipsodimorphina spp.Ellipsodimorphina spp.%Alegret, LaiaCounting >63 µm fraction
38Eouvigerina subsculpturaE. subsculptura%Alegret, LaiaCounting >63 µm fraction
39Eouvigerina spp.Eouvigerina spp.%Alegret, LaiaCounting >63 µm fraction
40Euuvigerina elongataE. elongata%Alegret, LaiaCounting >63 µm fraction
41Fissurina spp.Fissurina spp.%Alegret, LaiaCounting >63 µm fraction
42Frondicularia sp.Frondicularia sp.%Alegret, LaiaCounting >63 µm fraction
43Fursenkoina tegulataF. tegulata%Alegret, LaiaCounting >63 µm fraction
44Glandulina spp.Glandulina spp.%Alegret, LaiaCounting >63 µm fraction
45Globulina priscaG. prisca%Alegret, LaiaCounting >63 µm fraction
46Globulina spp.Globulina spp.%Alegret, LaiaCounting >63 µm fraction
47Guttulina sp.Guttulina sp.%Alegret, LaiaCounting >63 µm fraction
48Globorotalites sp.Globorotalites sp.%Alegret, LaiaCounting >63 µm fraction
49Gyroidinoides beisseliG. beisseli%Alegret, LaiaCounting >63 µm fraction
50Gyroidinoides depressusG. depressus%Alegret, LaiaCounting >63 µm fraction
51Gyroidinoides globosusG. globosus%Alegret, LaiaCounting >63 µm fraction
52Gyroidinoides gyrardanusG. gyrardanus%Alegret, LaiaCounting >63 µm fraction
53Gyroidinoides spp.Gyroidinoides spp.%Alegret, LaiaCounting >63 µm fraction
54Heronallenia lingulataH. lingulata%Alegret, LaiaCounting >63 µm fraction
55LaevidentalinidaeLaevidentalinidae%Alegret, LaiaCounting >63 µm fractionLaevidentalinids
56Lagena spp.Lagena spp.%Alegret, LaiaCounting >63 µm fraction
57Lenticulina spp.Lenticulina spp.%Alegret, LaiaCounting >63 µm fraction
58Marginulina sp.Marginulina sp.%Alegret, LaiaCounting >63 µm fraction
59Neoflabellina sp.Neoflabellina sp.%Alegret, LaiaCounting >63 µm fraction
60Nuttallides spp.Nuttallides spp.%Alegret, LaiaCounting >63 µm fraction
61Nuttallides truempyiN. truempyi%Alegret, LaiaCounting >63 µm fraction
62Nuttallinella florealisN. florealis%Alegret, LaiaCounting >63 µm fraction
63Nuttallinella spp.Nuttallinella spp.%Alegret, LaiaCounting >63 µm fraction
64Oridorsalis plummeraeO. plummerae%Alegret, LaiaCounting >63 µm fraction
65Oridorsalis umbonatusO. umbonatus%Alegret, LaiaCounting >63 µm fraction
66Oridorsalis spp.Oridorsalis spp.%Alegret, LaiaCounting >63 µm fraction
67Osangularia cordierianaO. cordieriana%Alegret, LaiaCounting >63 µm fraction
68Osangularia velascoensisO. velascoensis%Alegret, LaiaCounting >63 µm fraction
69Osangularia spp.Osangularia spp.%Alegret, LaiaCounting >63 µm fraction
70Paliolatella sp.Paliolatella sp.%Alegret, LaiaCounting >63 µm fraction
71Paralabamina hillebrandtiP. hillebrandti%Alegret, LaiaCounting >63 µm fraction
72Paralabamina lunataP. lunata%Alegret, LaiaCounting >63 µm fraction
73Paralabamina sp.Paralabamina sp.%Alegret, LaiaCounting >63 µm fractionthick
74Pleurostomella spp.Pleurostomella spp.%Alegret, LaiaCounting >63 µm fraction
75Praebulimina reussiP. reussi%Alegret, LaiaCounting >63 µm fraction
76Praebulimina spp.Praebulimina spp.%Alegret, LaiaCounting >63 µm fraction
77Pseudopolimorphina cuyleriP. cuyleri%Alegret, LaiaCounting >63 µm fraction
78Pseudopolimorphina sp.Pseudopolimorphina sp.%Alegret, LaiaCounting >63 µm fraction
79Pullenia jarvisiP. jarvisi%Alegret, LaiaCounting >63 µm fraction
80Pyramidina ruditaP. rudita%Alegret, LaiaCounting >63 µm fraction
81Pyramidina sp.Pyramidina sp.%Alegret, LaiaCounting >63 µm fraction
82Pyrulinoides sp.Pyrulinoides sp.%Alegret, LaiaCounting >63 µm fraction
83Quadratobuliminella pyramidalisQ. pyramidalis%Alegret, LaiaCounting >63 µm fraction
84Quadrimorphina allomorphinoidesQ. allomorphinoides%Alegret, LaiaCounting >63 µm fraction
85Quadrimorphina sp.Quadrimorphina sp.%Alegret, LaiaCounting >63 µm fractionflat
86Quinqueloculina sp.Quinqueloculina sp.%Alegret, LaiaCounting >63 µm fraction
87Reussella szajnochaeR. szajnochae%Alegret, LaiaCounting >63 µm fraction
88Scheibnerova sp.Scheibnerova sp.%Alegret, LaiaCounting >63 µm fraction
89Stilostomella subspinosaS. subspinosa%Alegret, LaiaCounting >63 µm fraction
90Stensioeina beccariiformisS. beccariiformis%Alegret, LaiaCounting >63 µm fraction
91Valvalabamina lenticulaV. lenticula%Alegret, LaiaCounting >63 µm fraction
Size:
1350 data points

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