Parent Layer: Geologic Units

Name: Ogallala Formation

Display Field: Unit_Name

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This geologic map was prepared as a part of a study of digital methods and techniques as applied to complex geologic maps. The geologic map was digitized from the original scribe sheets used to prepare the published Geologic Map of Colorado (Tweto 1979). Consequently the digital version is at 1:500,000 scale using the Lambert Conformal Conic map projection parameters of the state base map. Stable base contact prints of the scribe sheets were scanned on a Tektronix 4991 digital scanner. The scanner automatically converts the scanned image to an ASCII vector format. These vectors were transferred to a VAX minicomputer, where they were then loaded into ARC/INFO. Each vector and polygon was given attributes derived from the original 1979 geologic map.

Copyright Text: The author wishes to thank Richard Taylor for storing and protecting the original Geologic Map of Colorado scribe sheets and negatives, Margaret Clemensen for assistance in preparing the explanation sheet and Scott Hogan and Kirsten Findell for review of the digital map; all are with the USGS. The author wishes to thank Randy Phillips of the Colorado State Geologic Survey for creating the TWETO.SHD shadeset.

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Extent:

XMin: 602144.8677000003
YMin: 4356606.666999999
XMax: 610718.6390000004
YMax: 4365143.2007
Spatial Reference: 26913  (26913)

Drawing Info:

Renderer:
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UniqueValueInfos:
• Value: covered
  Label: Ogallala Formation, covered
  Description:
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• Value: outcrop
  Label: Ogallala Formation, outcrop
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Transparency: 0
Labeling Info:

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Type ID Field: null

Fields:

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Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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