State of Maryland DEPARTMENT OF NATURAL RESOURCES MARYLAND GEOLOGICAL SURVEY Jeffrey P. Halka, Director REPORT OF INVESTIGATIONS NO. 80 GEOLOGY OF THE LINGANORE NAPPE IN THE WESTMINSTER TERRANE, WESTERN PIEDMONT OF MARYLAND by Jonathan Edwards, Jr. 2012 Martin O’Malley Governor Anthony C. Brown Lieutenant Governor John R. Griffin Secretary Joseph P. Gill Deputy Secretary MARYLAND DEPARTMENT OF NATURAL RESOURCES 580 Taylor Avenue Annapolis, Maryland 21401 General DNR Public Information Number: 1-800-260-8DNR http://www.dnr.maryland.gov Publication Number DNR 12-582012-570 MARYLAND GEOLOGICAL SURVEY 2300 St. Paul Street Baltimore, Maryland 21218 General MGS Telephone Number: 410-554-5500 http://www.mgs.md.gov The facilities and services of the Maryland Department of Natural Resources are available to all without regard to race, color, religion, sex, age, national origin, or physical or mental disability. ii TABLE OF CONTENTS page EXECUTIVE SUMMARY .......................................................................................................................... 1 ABSTRACT.................................................................................................................................................. 2 INTRODUCTION ........................................................................................................................................ 3 GEOLOGIC SETTING...................................................................................................................... 3 HISTORY OF INVESTIGATIONS................................................................................................... 4 STRATIGRAPHY ........................................................................................................................................ 4 SAMS CREEK FORMATION .......................................................................................................... 5 Name and previous work......................................................................................................... 5 Lithologic description.............................................................................................................. 5 Distribution.............................................................................................................................. 6 Environment of deposition....................................................................................................... 6 WAKEFIELD MARBLE................................................................................................................... 6 Name and previous work......................................................................................................... 6 Lithologic description.............................................................................................................. 6 Distribution.............................................................................................................................. 6 Environment of deposition....................................................................................................... 8 SUGARLOAF MOUNTAIN QUARTZITE ...................................................................................... 8 Name and previous work......................................................................................................... 8 Lithologic description.............................................................................................................. 8 Distribution.............................................................................................................................. 8 Environment of deposition....................................................................................................... 8 URBANA FORMATION................................................................................................................... 8 Name and previous work......................................................................................................... 8 Lithologic description.............................................................................................................. 9 Distribution.............................................................................................................................. 9 Environment of deposition....................................................................................................... 9 ARABY FORMATION ..................................................................................................................... 9 Name and previous work......................................................................................................... 9 Lithologic description.............................................................................................................. 9 Distribution............................................................................................................................ 10 Environment of deposition..................................................................................................... 10 IJAMSVILLE FORMATION .......................................................................................................... 10 Name and previous work....................................................................................................... 10 Lithologic description............................................................................................................ 10 Distribution............................................................................................................................ 10 Environment of deposition..................................................................................................... 11 MARBURG FORMATION............................................................................................................. 11 Name and previous work....................................................................................................... 11 Lithologic description............................................................................................................ 11 Distribution............................................................................................................................ 12 Environment of deposition..................................................................................................... 12 SILVER RUN LIMESTONE........................................................................................................... 12 Name and previous work....................................................................................................... 12 Lithologic description............................................................................................................ 12 Distribution............................................................................................................................ 13 Environment of deposition..................................................................................................... 13 iii GILLIS FORMATION..................................................................................................................... 13 Name and previous work....................................................................................................... 13 Lithologic description............................................................................................................ 13 Distribution............................................................................................................................ 15 PRETTYBOY SCHIST.................................................................................................................... 15 Name and Previous work....................................................................................................... 15 Lithologic description............................................................................................................ 16 Distribution............................................................................................................................ 16 Environment of deposition..................................................................................................... 16 CORRELATION AND AGE...................................................................................................................... 16 INTRODUCTION............................................................................................................................ 16 SAMS CREEK FORMATION ........................................................................................................ 16 WAKEFIELD MARBLE................................................................................................................. 18 SUGARLOAF MOUNTAIN QUARTZITE .................................................................................... 18 URBANA FORMATION................................................................................................................. 18 ARABY FORMATION ................................................................................................................... 18 IJAMSVILLE FORMATION .......................................................................................................... 18 MARBURG FORMATION............................................................................................................. 19 SILVER RUN LIMESTONE..........................................................................................................