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FORAMINIFERAL RESPONSE TO ECOLOGICAL
PERTURBATIONS ALONG THE EASTERN MARGIN OF
THE CANADIAN WESTERN INTERIOR SEAWAY,
CENOMANIAN-TURONIAN INTERVAL
DANIELLE DIONNE, CLAUDIA J. SCHRÖDER-ADAMS AND STEPHEN L. CUMBAA
APPENDIX 6. Color versions of Figures 1–3 and 6–10.
FIGURE 1: Map of the Manitoba Escarpment showing the locations
of the outcrop (BR3) and the core (BRC), modified from Schröder-
Adams et al. (2001), and paleogeographic map showing the extent
of the seaway during the early Cenomanian and early Turonian,
modified from Bhattacharya & MacEachern (2009). The numbered
uplands with significant exposures of Upper Cretaceous strata are as
follows (1) Pasquia Hills, (2) Porcupine Hills, (3) Duck Mountain,
(4) Riding Mountain, and (5) Pembina Mountain.
FIGURE 2: Map of Canada showing reconstructed main wind
direction, dispersing ash from the western margin of the seaway
throughout the Cenomanian-Turonian interval, currents influencing
the seaway, and the locations of bolide impacts; the Steen River
impact crater in northern Alberta, dated at 91 ± 7 Ma, and the Deep
Bay impact crater in northern Saskatchewan, dated at 99 ± 4 Ma
(Earth Impact Database). Modified from Fanti (2009), Grieve
(2006), Hay & Floegel (2012), Hasegawa et al. (2012), and Price et
al. (1995).
FIGURE 3: Stratigraphic chart of the Canadian WISB. Modified
after Schröder-Adams et al. (2001), Phillips (2008), Nicolas
(2009), and Bamburak & Nicolas (2009).
B) Legend of symbols.
FIGURE 6: A) Measured section BR3 (Bainbridge River Locality #3)
at Bainbridge River. Modified from Schröder-Adams et al. (2001).
Sample numbers indicated to the right of the stratigraphic column.
FIGURE 7: Foraminiferal biostratigraphic zones within the
Cenomanian to Turonian Interval. Modified from Tyagi et al.
(2007), Caldwell et al. (1978), and McNeil & Caldwell (1981).
FIGURE 8: Reference well 11-36-22-1W2 - BDC (Bredenbury Core).
Sample numbers indicated to the right of the stratigraphic column.
See figure 6B for legend.
FIGURE 9: Change in planktic foraminiferal diversity and abundance
(blue), and percentage of assemblage made up by Heterohelix
globulosa at BDC (Distal) and BR3 (Proximal). The five correlation
lines are: 1) the initial planktic occurrence; 2) the appearance of C.
simplex; 3) the presence of very few poorly preserved specimen of
Muricohedbergella sp. at BDC and loss of all foraminifera in BR3; 4)
a decline in foraminiferal diversity and abundance; 5) the loss of the
planktic assemblage. See figure 6B for legend of symbols.
FIGURE 10: Cross-basin comparison of stratigraphy and events at
Pueblo Rock Canyon (USA) (Eicher & Worstell, 1970; Leckie et
al., 1997; Young & Sageman, 2014), Sioux City (USA) (Elderbak
et al., 2014), Bredenbury (Canada), and Bainbridge River
(Canada). FAD: First appearance of planktic foraminifera, C: C.
simplex is present, BZ: Benthic zone, OAE-2: First excursion of
the OAE-2, LAD: Last appearance of planktic foraminifera.