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YOUNG, LEAH D., University of Iowa, Dept. of Geology, Iowa City, IA

Abstract: High Resolution Chemostratigraphy of Amalgamated Paleosols

Ongoing lithostratigraphic and sequence stratigraphic work at the University of Iowa has led to correlation of Cretaceous (Albian-Turonian) non-Previous HitmarineNext Hit to Previous HitmarineNext Hit strata along a transect approximately perpendicular to the paleoshoreline of the Western Interior Seaway. This work has been undertaken in support of paleoclimatologic studies of non-Previous HitmarineNext Hit strata where chronostratigraphy is based primarily on palynostratigraphy.

The lithologic correlations have been tied to detailed coeval, mid-basin geochemical profiles completed by other workers. Correlations of these geochemical profiles are based on a parasequence model for the development of geochemical facies which provides chronostratigraphic resolution of ~100,000 years. The high resolution chronostratigraphy revealed by the parasequence model can be applied to non-Previous HitmarineNext Hit chronstratigraphy in places where the geochemically defined parasequences interfinger with non-Previous HitmarineNext Hit paleosols. Oxygen isotope chemostratigraphic profiles have been established for the amalgamated paleosols in Northwestern Iowa and Nebraska, and high resolution geochemical reference sections are established for the mid-basin, Previous HitmarineNext Hit strata in Colorado, Kansas, Iowa, and Saskatchewan. The goals of this project are to generate an oxygen isotope chemostratigraphy from paleosols and a geochemical record from Previous HitmarineNext Hit strata (Rockeval, carbon coulometry), found in the Kenyon core from North-central Kansas where the two facies are interfingered.

This approach will allow me to generate a higher resolution non Previous HitmarineTop chronostratigraphy by tying oxygen isotope records and the parasequence model for geochemical facies in the transitional interfingered facies. 

AAPG Search and Discovery Article #90925©1999 AAPG Foundation Grants-in-Aid