foraminiferal response to ecological perturbations … · figure 9: change in planktic...

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.