Quaternary Geologic Map of the Chicago 4° x 6° Quadrangle, United States

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/1420/NK-16/metadata.faq.html
Description The Quaternary Geologic Map of the Chicago 4° x 6° Quadrangle was mapped as part of the Quaternary Geologic Atlas of the United States. The atlas was begun as an effort to depict the areal distribution of surficial geologic deposits and other materials
Originators Richmond, Gerald M.; U.S. Geological Survey; Fullerton, David S.; Lineback, Jerry A.; Bleuer, Ned K.; Mickelson, David M.; Farrand, William R.; and Goldthwait, Richard P.
Publication U.S. Geological Survey Miscellaneous Investigations Series Map I-1420 (NK-16)

Related topics

States or counties

Overview of attributes

Bathymetry values are depth in meters
>Cell Size = 5.000
>Data Type: Floating Point
>Number of Rows = 2517
>Number of Columns = 2471
BOUNDARY
>Xmin = 412510.031
>Xmax = 424865.031
>Ymin = 3076795.750
>Ymax = 3089380.750
STATISTICS
>Minimum Value = -178.420
>Maximum Value = -16.232
>Mean = -107.947
>Standard Deviation = 23.573
Backscatter values are a digital number (DN) associated with the reflected energy off the seafloor
>Cell Size = 5.000
>Data Type: Floating Point
>Number of Rows = 2517
>Number of Columns = 2471
BOUNDARY
>Xmin = 412510.031
>Xmax = 424865.031
>Ymin = 3076795.750
>Ymax = 3089380.750
STATISTICS
>Minimum Value = 0.000
>Maximum Value = 241.364
>Mean = 176.392
>Standard Deviation = 8.294

http://pubs.usgs.gov/dds/dds-55/pacmaps/openfile.htm