Contents for SPE249: The Cretaceous/Tertiary Boundary Interval, Raton Basin, Colorado and New Mexico, and its Content of Shock-Metamorphosed Minerals; Evidence Relevent to the K/T Boundary Impact-Extinction Theory

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Table of Contents - Special Paper 249:
The Cretaceous/Tertiary Boundary Interval, Raton Basin, Colorado and New Mexico, and its Content of Shock-Metamorphosed Minerals; Evidence Relevent to the K/T Boundary Impact-Extinction Theory
Acknowledgments Abstract Introduction Purpose of the study K/T boundary interval rocks in the Raton Basin Rocks directly underlying the K/T boundary claystone K/T boundary claystone bed Microstratigraphic relationships Contact relationships Chemical composition of the K/T boundary claystone Authigenic spherules Origin of spherules Origin of the K/T boundary claystone K/T boundary impact layer Chemical composition of the K/T boundary impact layer Origin of iridium anomaly Origin of the K/T boundary impact layer Rocks directly overlying the K/T boundary impact layer Clastic mineral grains of the K/T boundary impact layer Shock-metamorphosed minerals Shock-metamorphosed features in K/T boundary clastic minerals Shock lamellae Indices of refraction of shocked quartz Mosaicism Thetomorphic glass Stishovite Origin of shock-metamorphic features in K/T boundary minerals Information gained from study of K/T boundary rocks Information gained from study of pyroclastic rocks Amount of shock-metamorphosed minerals in the K/T boundary impact layer Shape of shock-metamorphosed mineral grains Size of shock-metamorphosed mineral grains Location of the K/T boundary impact K/T boundary impact crater size K-Ar age of the K/T boundary Conclusions References cited

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Table of Contents - Special Paper 249:

The Cretaceous/Tertiary Boundary Interval, Raton Basin, Colorado and New Mexico, and its Content of Shock-Metamorphosed Minerals; Evidence Relevent to the K/T Boundary Impact-Extinction Theory