Layer: Top of Denver Formation Lower Fan (ft below surface) (ID: 96)

Parent Layer: Denver Formation Lower Fan Top

Name: Top of Denver Formation Lower Fan (ft below surface)

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Description: This raster dataset represents depth to the top of the Denver Formation lower fan in Elbert County.This feature dataset was compiled and created by the Colorado Geological Survey into this format for use in publication OF-18-12 by the following process:Tops data for selected contacts were generated in Petra©. Correlations were derived using multiple cross sections using multiple datums to arrive at optimum "picks". Detailed descriptions of geophysical log characteristics for the "picks" are in the text report; description for this stratigraphic boundary is in the Lineage section of this metadata compilation. Values were exported as SS values with X-Y coordinates in NAD 83 to be imported as X-Y data into ArcGIS. In ArcGIS© point data were hand-contoured as polylines in 50-foot intervals with contours extending well beyond the County edges or probable surface extents of the surfaces. Where surface geology allowed, contours were directed to intersect at known, or suspected, contact exposures.Subsurface extent has been estimated by projecting surface exposure patterns into the subsurface using interpretations of surface structural relationships (strike and dip) as well as projecting structural maps created using subsurface tops data to the surface.This raster was created in 2019 in ArcGIS for Desktop Version 6.2 (Build 9200); Esri ArcGIS 10.6.1.9270.

Copyright Text: This project was funded by a grant from the Colorado Water Conservation Board (CWCB) matched by the Colorado Geological Survey (CGS) through its Severance Tax Operational Funds. Many people contributed to this project indirectly over the years. Development of the generalized geologic map builds on many hours of field mapping by CGS and U.S. Geological Survey (USGS) geologists. In particular, the authors owe gratitude to Matt Morgan and Jon Thorson for their tireless detective efforts at the 1:24,000 quadrangle scale weaving the geologic history of the region. We would also like to recognize Matt Sares of the Colorado Division of Water Resources and his staff for their input with respect to the geology of the Denver basin.

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