Introduction

1

STOP 1: Lime Creek Formation at Bird Hill

by Brian J. Witzke

3

Devonian Carbonate Strata in the Mason City Area

STOP 2A: Holnam Limestone Quarry

by Brian J. Witzke

9

STOP 2B: Portland Cement Production at the Holnam Inc. Mason City Plant

by Raymond R. Anderson

21

Stop 3:  Lunch at Clear Lake—Lake History

by E. Arthur Bettis III

27

Introduction to the Des Moines Lobe

by Deborah J. Quade and E. Arthur Bettis III

29

Road Log for Afternoon Stops

35

stop 4:  Pilot Knob State Park

by Deborah J. Quade and E. Arthur Bettis III

39

Dead Man’s Lake

by Carol A.Thompson

42

An Introduction to Hogs in Iowa

by Lynette Seigley and Deborah J. Quade

47

Stop 5.  Groundwater Monitoring Trends at an Earthen Manure-Storage Structure

by Deborah J. Quade, Robert D. Libra and Lynette S. Seigley

51

Stop 6.  Agricultural Drainage Wells in Wright County

Part I.  Geologic Setting by Lynette Seigley and Deborah J. Quade

63

Part II.  Agricultural Drainage Well Policy by Susan K. Heathcote

64