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From page 59... ... ESTABLISHING A CHRONOLOGY FOR ENVIRONMENTAL DECLINE AND MASS EXTINCTION ACROSS THE C-T BOUNDARY To compare the rates, patterns, and magnitude of environmental changes and biological stress leading to global late Cenomanian-early Turonian mass extinction, with the Quaternary record of global change, a highly detailed real 59 time scale must be established for the C-T interval. Integration of this time scale with physical, chemical, and biological event surfaces/beds, and with short-term cyclostratigraphic units (e.g., Milankovitch climate cycle deposits) Read the entire page →
From page 60... ... . When this method is applied to the Bridge Creek Limestone Member at Pueblo, the calculated values for the 100,000-yr Milankovitch bedding rhythms deviate from the mean values of 40Ar-39Ar ages within the member by 100,000 to 160,000 yr, and vary from the time scale calculated on the assignment of equal durations to successive ammonite biozones by 150,000 to 360,000 yr. Read the entire page →

From page 59...

... ESTABLISHING A CHRONOLOGY FOR ENVIRONMENTAL DECLINE AND MASS EXTINCTION ACROSS THE C-T BOUNDARY To compare the rates, patterns, and magnitude of environmental changes and biological stress leading to global late Cenomanian-early Turonian mass extinction, with the Quaternary record of global change, a highly detailed real 59 time scale must be established for the C-T interval. Integration of this time scale with physical, chemical, and biological event surfaces/beds, and with short-term cyclostratigraphic units (e.g., Milankovitch climate cycle deposits)

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From page 60...

... . When this method is applied to the Bridge Creek Limestone Member at Pueblo, the calculated values for the 100,000-yr Milankovitch bedding rhythms deviate from the mean values of 40Ar-39Ar ages within the member by 100,000 to 160,000 yr, and vary from the time scale calculated on the assignment of equal durations to successive ammonite biozones by 150,000 to 360,000 yr.

Read the entire page →

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