Lehigh Valley Geology Field Trips

North Field Trip

Topography, Structure and History of Lehigh Valley Rocks of Intermediate Age

(Click on images to enlarge)

(Source:  DeLorme 3-D TopoQuads)

Field trip #2 explores the area to the northwest of Bethlehem.  The locations of the stops are indicated by the red flags on the above map.
     Stop #1:   Abandoned quarry near Monocacy River floodplain
     Stop #2:   Inactive Quarry of Keystone Portland Cement Co.
     Stop #3:   Exposure along PA route 248 near Beersville
     Stop #4:   Gap of Lehigh River near Palmerton
     Stop #5:   Little Gap on Blue Ridge Mountain near Danielsville

The main theme of Field Trip #2 is to determine the nature and timing of the deformation of the Appalachian Mountains, based upon the exposures seen along the field trip route.  The sub-themes are as follows:
     Stop #1:    Lerch's Quarry:  Structures Within The Allentown Formation
     Stop #2:    Bath Quarry:  Cement Limestone and Its Deformation
     Stop #3:    Deformational Features Within the Martinsburg Formation
     Stop #4:    Lehigh Water Gap:  Structure and Topography
     Stop #5:    Devil's Potato Patch in a Wind Gap:  A Geomorphic Extravaganza

Earliest Aerial Photograph of Lehigh Valley, 1947.
(Source:  National Archives)