Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming

Online link https://geo-nsdi.er.usgs.gov/metadata/map-i/2690/metadata.faq.html
Description The Ennis 1:100,000 quadrangle lies within both the Laramide (Late Cretaceous to early Tertiary) foreland province of southwestern Montana and the northeastern margin of the middle to late Tertiary Basin and Range province. The oldest rocks in the quadran
Originators Kellogg, Karl S. and Williams, Van S.

Related topics

States or counties

Overview of attributes

>Attribute items are in ARC/INFO feature class format.  Additional
>items that were added to the data are:
>
>POLYGON
>
>attribute        description
>=========	===========
>acc_val	      Acceleration value in percent of gravity of the
>                 polygon.  The polygon represents the range of
>                 acceleration values that are contained within its
>                 borders.  The polygon is assigned the lowest value
>                 allowed within the polygon's borders.  The range of
>                 values allowed within a polygon is controlled by the
>                 contours.  Valid values are:  0,1,2,3,4,5,6,7,8,9,10,
>                 15,20,25,30,40,60,80,100
>
>valley		A topological indicator that tells whether the area
>                 contained within the polygon is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.
>LINE
>
>attribute 	description
>=========	===========
>acc_val	      Acceleration value in percent of gravity that the
>                 contour represents.  Valid values are: 0,1,2,3,4,5,6,7,
>                 8,9,10,15,20,25,30,40,60,80,100
>
>valley		A topological indicator that tells whether the area
>                 contained within the contour is a local minima (valley)
>                 or not.  A value of "1" indicates the area is a local
>                 minima.

none