Timing of Mid-Cretaceous Relative Sea Level Changes in the Western Interior: Amoco No. 1 Bounds Core

The Cenomanian/Turonian anoxic event at the Bonarelli Level in Italy and Spain: enhanced productivity and/or better preservation?

“…However, as previously mentioned, based on correlations with the Pueblo section, the Furlo section though condensed, still seems relatively complete. The average rate of 0.19 cm/ky compares well with the average rates of 0.5e1.0 cm/ky (Elder and Kirkland, 1985), 0.9 cm/ky ( Scott et al, 1998) and 0.57 cm/ky (Sageman et al, 1998) for the shallower environment of the Pueblo section. The major sedimentary break or discontinuity between the B and C intervals may be a biostratigraphic artifact (e.g.…”

A Chemostratigraphic Model for the Development of Parasequences and Its Application to Sequence Stratigraphy and Paleoceanography, Cretaceous Western Interior Basin, USA

“…In the Amoco Rebecca K. Bounds #1 core (western Kansas), the geochemically defined parasequences of Ku Shafie (2005) correlate to the coarsening and fining-upward cycles delineated by Scott et al (1998). The correlation of geochemically defined parasequences in Ku Shafie (2005) to lithologically defined cycles in Scott et al (1998) provides some validity to this parasequence delineation method. The sedimentary geochemical setting of select portions of the ancient seafloor changed as relative sea level fluctuations occurred within the KWIS.…”

“…When the Arrow Creek bentonite was not present, the Albian-Cenomanian boundary was chosen using palynological data from Scott et al (1998) (for the Bounds core) and regional trends of depletion in oxygen isotopic signatures from paleosol sphaerosiderites in the Kenyon and Bounds cores (based on the boundary pick described in White et al, 2005). The Thatcher Limestone represents the maximum flooding during the middle Cenomanian (Scott et al, 1998).…”

“…The Thatcher Limestone represents the maximum flooding during the middle Cenomanian (Scott et al, 1998). The X-bentonite was deposited in close proximity to the Graneros-Greenhorn contact in western Kansas (Scott et al, 1998). The Bridge Creek Limestone is a member of the Greenhorn Formation and marks the maximum extent of the Greenhorn marine cycle and the maximum aerial extent of the KWIS (Elder and Kirkland, 1985).…”

Sequence stratigraphic controls on synsedimentary cementation and preservation of dinosaur tracks: Example from the lower Cretaceous, (Upper Albian) Dakota Formation, Southeastern Nebraska, U.S.A.

“…Terrestrial strata have been subdivided into palynostratigraphic units, which are largely coincident with marine cycles of the Western Interior Seaway (Ravn and Witzke, 1995) (Table 1). The horizons sampled as part of this study are situated approximately 5 m above the "D 1 " unconformity identified by Brenner et al (2000) and are interpreted to be part of the Muddy Cycle (sensu Scott et al, 1998) or the "J Sequence" of Hamilton (1994). The Muddy Cycle followed the Kiowa-Skull Creek Cycle, recognized by estuarine and fluvial deposits that extend hundreds of kilometers from the seaway edge into central Iowa.…”