Relief shown by contours. Depths shown by isolines. Map is colored to show red for gneiss, yellow for white limestone and blue for blue limestone. Includes 2 cross sections: Section across the zinc mines at Mine Hill and section across the zinc mines at Stirling Hill. "Note: The figures on the contour lines give the heights, in feet, above mean tide, and the contour lines show where the surface is of that height." From: Geological survey of New Jersey : maps. [Trenton, N.J. : State Geologist, 1868].