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

The geo_net coverage includes polygons that are map units and
open water, and arcs that are contacts, colorboundaries, and
shoreline.
The geo_net.pat INFO file consists of the following items:
GEOCODE--Refers to the type of polygon and is one of the following:
map unit code, "lake", or "island".
AGE--Refers to the age of the map unit and is one of the following:
"HOLOCENE", "HOLOCENE AND LATE WISCONSIN", "LATE WISCONSIN",
"EARLY WISCONSIN", "WISCONSIN", "ILLINOIAN", "PLEISTOCENE",
"QUATERNARY" OR "PRE-QUATERNARY".
MORAINES--A modifier to the map unit indicating that the unit is a
moraine and is one of the following:  "Ground Moraine", "End
Moraine", or "Ground Moraine and end moraine under Lake Michigan."
MAP_UNITS--A description of the soils within the map units (see below).
MODIFIER--Indicates that the map unit is covered with loess more than
2 m thick ("loess mantle") or if the unit is under water ("submerged").
COLOR--An integer value representing a shade pattern in the shadeset
color524.shd used in preparing the plotfile of the map.
Items in geo_net.pat are defined as follows:
>GEOCODE	MAPUNITS, (AGE)
>
>lc	LAKE CLAY AND SILT UNDER LAKE MICHIGAN, HOLOCENE
>ls	LAKE SAND AND GRAVEL UNDER LAKE MICHIGAN, HOLOCENE
>
>al	ALLUVIUM, HOLOCENE AND LATE WISCONSIN
>hs	SWAMP DEPOSIT, HOLOCENE AND LATE WISCONSIN
>hp	PEAT, HOLOCENE AND LATE WISCONSIN
>es	EOLIAN SHEET SAND, HOLOCENE AND LATE WISCONSIN
>ed	DUNE SAND, HOLOCENE AND LATE WISCONSIN
>el	LOESS, HOLOCENE AND LATE WISCONSIN
>ca	COLLUVIUM AND SHEETWASH ALLUVIUM, HOLOCENE AND LATE WISCONSIN
>
>lca	LAKE CLAY AND SILT, LATE WISCONSIN
>lsa	LAKE SAND AND GRAVEL, LATE WISCONSIN
>gg	OUTWASH SAND AND GRAVEL, LATE WISCONSIN
>gs	OUTWASH SAND, LATE WISCONSIN
>kg	ICE-CONTACT SAND AND GRAVEL, LATE WISCONSIN
>
>		Tills in Wisconsin, Michigan, Indiana, and Ohio
>tc	CLAYEY TILL--Ground moraine, LATE WISCONSIN
>tc	CLAYEY TILL--End moraine, LATE WISCONSIN
>tca	CLAYEY TILL--Ground moraine, LATE WISCONSIN
>tca	CLAYEY TILL--End moraine, LATE WISCONSIn
>tcb	CLAYEY TILL--Ground moraine, LATE WISCONSIN
>tcb	CLAYEY TILL--End moraine, LATE WISCONSIN
>tl	LOAMY TILL--Ground moraine, LATE WISCONSIN
>tl	LOAMY TILL--End moraine, LATE WISCONSIN
>tlg	LOAMY TILL--Ground moraine, LATE WISCONSIN
>tlg	LOAMY TILL--End moraine, LATE WISCONSIN
>td	SANDY LOAMY TILL--Ground moraine, LATE WISCONSIN
>td	SANDY LOAMY TILL--End moraine, LATE WISCONSIN
>
>		Till Members of Wedron Formation in Illinois and under
> 		Lake Michigan, and Equivalent Tills in Adjacent Wisconsin
>		and Indiana
>tac	CLAYEY TILL (MANITOWOC TILL MEMBER UNDER LAKE MICHIGAN),
>	  LATE WISCONSIN
>tad	CLAYEY TILL (SHOREWOOD TILL MEMBER UNDER LAKE MICHIGAN),
>	  LATE WISCONSIN
>tah	CLAYEY TILL (WADSWORTH TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN INDIANA)--Ground moraine, LATE WISCONSIN
>tah	CLAYEY TILL (WADSWORTH TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN INDIANA)--Ground moraine and end moraine under Lake Michigan,
>	  LATE WISCONSIN
>tah	CLAYEY TILL (WADSWORTH TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN INDIANA)--End moraine, LATE WISCONSIN
>tea	SANDY LOAMY TILL (HAEGER TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN WISCONSIN)--Ground moraine, LATE WISCONSIN
>tea	SANDY LOAMY TILL (HAEGER TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN WISCONSIN)--End moraine, LATE WISCONSIN
>taj	CLAYEY TILL (YORKVILLE TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN INDIANA)--Ground moraine, LATE WISCONSIN
>taj	CLAYEY TILL (YORKVILLE TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT
>	  IN INDIANA)--End moraine, LATE WISCONSIN
>tan	CLAYEY TILL (SNIDER TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT IN
>	  INDIANA)--Ground moraine, LATE WISCONSIN
>tan	CLAYEY TILL (SNIDER TILL MEMBER IN ILLINOIS AND ITS EQUIVALENT IN
>	  INDIANA)--End moraine, LATE WISCONSIN
>tkb	LOAMY TILL (BATESTOWN TILL MEMBER, MALDEN TILL MEMBER, AND MALDEN
>	  AND SNIDER TILL MEMBERS UNDIFFERENTIATED IN ILLINOIS; BATESTOWN
>	  TILL MEMBER EQUIVALENT IN INDIANA)--Ground moraine, LATE WISCONSIN
>tkb	LOAMY TILL (BATESTOWN TILL MEMBER, MALDEN TILL MEMBER, AND MALDEN
>	  AND SNIDER TILL MEMBERS UNDIFFERENTIATED IN ILLINOIS; BATESTOWN
>	  TILL MEMBER EQUIVALENT IN INDIANA)--End moraine, LATE WISCONSIN
>tkc	LOAMY TILL (PIATT TILL MEMBER)--Ground moraine, LATE WISCONSIN
>tkc	LOAMY TILL (PIATT TILL MEMBER)--End moraine, LATE WISCONSIN
>tkd	LOAMY TILL (TISKILWA, DELAVAN, AND FAIRGRANGE TILL MEMBERS IN
>       ILLINOIS; FAIRGRANGE TILL MEMBER EQUIVALENT IN INDIANA)
>       --Ground moraine, LATE WISCONSIN
>tkd	LOAMY TILL (TISKILWA, DELAVAN, AND FAIRGRANGE TILL MEMBERS IN
>       ILLINOIS; FAIRGRANGE TILL MEMBER EQUIVALENT IN INDIANA)
>         --End moraine, LATE WISCONSIN
>
>
>tkj	LOAMY TILL (CAPRON TILL MEMBER OF WINNEBAGO FORMATION IN ILLINOIS
>	  AND EQUIVALENT TILL IN WISCONSIN), EARLY WISCONSIN
>tej	SANDY LOAMY TILL (ARGYLE TILL MEMBER OF WINNEBAGO FORMATION IN
>	  ILLINOIS AND EQUIVALENT TILL IN WISCONSIN)--Ground moraine,
>       EARLY WISCONSIN
>tej	SANDY LOAMY TILL (ARGYLE TILL MEMBER OF WINNEBAGO FORMATION IN
>       ILLINOIS AND EQUIVALENT TILL IN WISCONSIN)--End moraine,
>	  EARLY WISCONSIN
>lcd	LAKE SILT AND CLAY, WISCONSIN
>lci	LAKE SILT AND CLAY, ILLINOIAN
>lsp	LAKE SAND AND SILT, ILLINOIAN
>gsi	OUTWASH SILT, SAND, AND GRAVEL, ILLINOIAN
>kgi	ICE-CONTACT SAND AND GRAVEL, ILLINOIAN
>
>
>tal	CLAYEY TILL (RADNOR AND STERLING TILL MEMBERS OF GLASFORD
>	  FORMATION IN ILLINOIS), ILLINOIAN
>tag	CLAYEY TILL (ESMOND TILL MEMBER OF GLASFORD FORMATION IN ILLINOIS),
>	  ILLINOIAN
>tke	LOAMY TILL (LEE CENTER TILL MEMBER OF GLASFORD FORMATION IN
>	  ILLINOIS) --Ground moraine, ILLINOIAN
>tke	LOAMY TILL (LEE CENTER TILL MEMBER OF GLASFORD FORMATION IN
>	  ILLINOIS) --End moraine, ILLINOIAN
>tkm	LOAMY TILL (OGLE, HULICK, AND VANDALIA TILL MEMBERS OF GLASFORD
>	  FORMATION IN ILLINOIS; OGLE TILL MEMBER EQUIVALENT IN WISCONSIN),
>	  ILLINOIAN
>tam	CLAYEY TILL (WINSLOW TILL MEMBER OF GLASFORD FORMATION IN ILLINOIS
>	  AND ITS EQUIVALENT IN WISCONSIN)--Ground moraine, ILLINOIAN
>tam	CLAYEY TILL (WINSLOW TILL MEMBER OF GLASFORD FORMATION IN ILLINOIS
>	  AND ITS EQUIVALENT IN WISCONSIN)--End moraine, ILLINOIAN
>cr	COLLUVIUM, PLEISTOCENE
>cc	COLLUVIUM, QUATERNARY
>R	BEDROCK, PRE-QUATERNARY
>f     MANMADE
>
>NOTE:  All units listed as EARLY WISCONSIN on the original map are
>presently recognized as being ILLINOIAN.  Unit lcd listed as WISCONSIN
>is probably ILLINOIAN and may be the same map unit as lci.
The geo_net.aat INFO file consists of the following item:
LTYPE--Refers to the type of arc and is one of the following:
"contact," "shoreline," or "map boundary."
The gla_lin coverage contains lines of linear glacial features.
The gla_lin.aat INFO file consists of the following items:
TYPE--Refers to the type of glacial feature described by the arc
and is one of the following:  "esker," "limit of glacial
advance," "buried moraine," "meltwater channel," "shoreline
deposits," or "map boundary".
MODIFIER--Refers only to ltype = "meltwater channel" and is
either "left bank" or "right bank".
ACCURACY--Refers to accuracy of location of arcs in the gla_lin
coverage and is either "certain" or "inferred".
NAME--Refers to the geounit name (taj) of inferred buried end moraine.
The gla_pnt coverage contains points that represent drumlins,
places where the direction of ice movement is indicated by
striations, or the location of important stratigraphic sections.
The gla_pnt.pat INFO file consists of the following items:
TYPE--Refers to the type of feature shown at the point and is
one of the following:  "drumlin," "direction of ice movement,"
"concentric minor moraines," "glacially fluted landforms," "wind
direction," or the name of important stratigraphic sections.
ANGLE--Refers to the direction of drumlin or ice movement; in
degrees measured clockwise from north.
MRKANGLE--Negative of ANGLE; useful for plotting srmbols in ARCPLOT.
Hydr_lin is a line coverage created after scanning the hydrographic
layer that was used in the original paper map.  It has no attributes.
Topo_lin is a line coverage created after scanning the topographic
layer that was used in the original paper map.  It has no attributes.
Bnd_lin is a line coverage created from 1:2,000,000-scale U.S.
Geological Survey Digital Line Graph coverages (DLG).  It contains
lines representing state boundaries.  The bnd_lin.aat INFO file
contains the following item:  LTYPE--Refers to the type of line
and contains the values: "state boundary", or "map boundary".  The
coverage is annotated with state names along boundaries.
Bnd_net is a polygon coverage created from 1:2,000,000-scale DLG
coverages and contains political and administrative boundaries.
Polygons are attributed in the standard DLG coding scheme and the
Federal Information Processing Standards (FIPS).
Rd_lin is a line coverage created from 1:2,000,000-scale DLG coverages.
The coverage contains lines representing roads in the map area.
All DLG attributes have been stripped from the lines except
ROUTE_NUMBER1, ROUTE_NUMBER2, ROUTE_NUMBER3, and ROUTE_NUMBER4.
Rr_lin is a line coverage created from 1:2,000,000-scale DLG coverages.
The coverage contains lines representing railroads in the map area.
It has no DLG attributes.
Grid_lin is a line coverage created to display projection lines in
one degree increments.  It has no attributes.

http://pubs.usgs.gov/imap/i-1420/nk-16/I-1420_nk-16_textonly.pdf