Abstract This guidebook chapter outlines a walking tour that provides an introduction to the geological, archaeological, and historical setting of Pittsburgh, with an emphasis on the use of local and imported geologic materials and resources in the eighteenth and nineteenth centuries. The focus is on downtown Pittsburgh, the low-lying triangle of land where the Monongahela and Allegheny Rivers join to form the Ohio River, and Coal Hill (Mount Washington), the escarpment along the Monongahela River to its south. Topics include the importance of—and concomitant effect of—historic coal use; use of local and imported geologic materials, including dimension stone used for buildings and gravestones, and chert used for gunflints and millstones; the frontier forts built at the site; and the ubiquitous landslides along Coal Hill.

Abstract This guidebook provides detailed itineraries of three of the geological field trips related to the 2017 joint meeting of the GSA Northeastern and North-Central Sections in Pittsburgh. The first chapter outlines a walking trip of downtown Pittsburgh and the escarpment to its south, consisting of seven “Pitt stops” investigating geological, archaeological, and historical aspects of the Gateway to the West. Venturing further afield, the second chapter describes a trip that explores periglacial features as far as the Upper Youghiogheny River basin in Maryland and the Laurel Highlands of Pennsylvania. The third chapter investigates hydrologic aspects of the 1889 Johnstown, Pennsylvania, flood, largely following the progress of the flood from its point of origin to the city of Johnstown.