Acknowledgements


We thank the many colleagues at the Pennsylvania Geological Survey who assisted us in some way with this field trip.  Samuel Berkheiser generously shared his knowledge of, and enthusiasm for, the Ordovician carbonates exposed at Union Furnace. We also appreciate his encouragement during the course of our work there.  Our Bureau Director, State Geologist Jay Parrish, also provided us with much encouragement and praise.  Laura DiCello ably assisted us in the field while working as a summer intern.  Les Chubb prepared samples for us at short notice and high speed.  Bob C. Smith III shared his knowledge of the Ordovician K-bentonites, and quickly rendered x-ray diffraction data and judgment on some of our suspect clays.  Jan Hayden helped us with last minute software crises; we GREATLY appreciate her patience and wit.

We thank William Berkepile for freely donating his wonderful photographs of cave formations in Tytoona Cave.  William B. White, Pennsylvania State University, shared his maps of Tytoona Cave and Field Trip Cave.  Linda and Dave Morrow, Arch Spring Farm bed and breakfast, graciously provided their property and catering service for our lunch stop.  Nathanael Barta, Ohio State University, gave us many insights into the complex world of conodont and K-bentonite correlations, particularly in regard to the PA 453 roadcut.

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