National Geologic Map Database
General Information
- Title: Surficial geology of the Ayer quadrangle, Massachusetts
- Author(s): Jahns, R.H.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Geologic Quadrangle Map GQ-21
- Publication Date: 1953
- Map Scale: 1:31,680
- Cross Section: None
- North Latitude: 42° 37' 30" N (42.6250)
- South Latitude: 42° 30' 0" N (42.5000)
- East Longitude: 71° 30' 0" W (-71.5000)
- West Longitude: 71° 37' 30" W (-71.6250)
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.