SDE Feature Class
Tags
geology, geoscientificInformation, United States, North Dakota, bedrock
Geologic Bedrock Map of North Dakota
Digital version of North Dakota Geological Survey Miscellaneous Map 25, Geologic Bedrock Map of North Dakota
Digitized by North Dakota Geological Survey. Annotated by North Dakota Dept. of Health-Divison of Water Quality
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.
Based on Bluemle, John P., 1983, Geologic and Topographic Bedrock Map of North Dakota, NDGS Miscellaneous Map 25, 1:670,000 scale.
publication date
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The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.
The State of North Dakota has compiled this data according to conventional cartographic standards, using what is thought to be the most reliable information available. This data is intended to make results of research available at the earliest possible date, but is not intended to constitute final or formal publication. The State of North Dakota makes every effort to provide virus-free files but does not guarantee uncorrupted files. The State of North Dakota does not guarantee this data to be free from errors, inaccuracies, or viruses, and disclaims any responsibility or liability for interpretations or decisions based on this data.
From Bluemle, JP, 1983: The most important source of information used in compiling this map was the test-hole data obtained during drilling by the North Dakota State Water Commission as part of a series of comprehensive groundwater studies of North Dakota. These studies have been underway since about 1960. Agencies cooperating in these studies have been the North Dakota Geologial Survey, North Dakota State WAter Commission, U.S. Geological Survey and The County Commission (or its equivalent). Additional geologic and topographic control for the map was obtained by the use of hte NDGS power auger; by study of exploratory oil well geophysical logs; by study of exploratory coal drilling data; and by examinations of exposures. In certain areas, assorted sources of data such as WPA well scedules, commercial water well driller's records, Minuteman missile site drilling data, and seismic information were utilized in compiling the map. The accurace of the map is dependant upon the density and reliability of the control points. The map is essentially precise in those parts of southwestern North Dakota where surface exposures are widespread and control is nearly continuous. The map is less precise in areas of thick glacial overburden, where only a few test holes have penetrated as deep as the bedrock surface.
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Abbreviation of geologic map unit name.
Geologic time period (Tertiary, Cretaceous, etc.)
corresponds to epoch of geologic time (Eocene; Paleocene; upper, or lower Cretaceous, etc)
Geologic formation name. Some map units have more than one formation name indicated on legend. All formation names from map legend are included in .pat
formal geologic group name, if any exists.
total thickness, in meters, of all lithologies in one geologic map unit.
color of geologic formation.
lithology of the uppermost geologic unit.
lithology of the geologic unit immediately below lith1
lithology of the geologic unit immediately below lith3.
Feature geometry.
ESRI
Coordinates defining the features.
Genesis1 corresponds to the origin of lith1.(How was this rock originally deposited?)
genesis2 is the origin of lith2. (see note on Genesis1)
Attributes are based on legend from original paper map. Lithology is subdivided based on if the map unit specifies more than one formally named unit. Genesis1 corresponds to the origin of lith1, genesis2 with lith2, etc. For example, The Golden Valley Formation has an upper and lower member. The upper member is lith1, with its origins reported in genesis1. The lower member lithology is in lith2, with its origin in genesis2.