Name: Pliocene Early Quaternary Gravel Deposits
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Description: The Alluvial Aquifer is present throughout Elbert county as a widespread network along active stream and river channels. In many places it may include alluvial fan deposits of tributary drainages. Groundwater present in the Alluvial Aquifer is unconfined and directly connected to the surface water, which allows the aquifer to either receive water from or transmit water to the surface water. The geology feature classes of this report incorporate the results of mapping at different scales from many sources, spanning decades of work by multiple authors. Primary sources consist of recent 1:24,000 quadrangle geologic maps produced by the CGS National Cooperative STATEMAP program and the USGS 1:250,000 (1 degree x 2 degree) quadrangle series. No 1:100,000 (30’ X 60’) scale maps are available within the county. Data from older or smaller scale maps have been used to fill in where detailed mapping has not been available. This dataset uses the most recent nomenclature and ages as published in the public domain.See lineage section for geologic maps used in the creation of this feature class.See report for in-text citations.This feature class 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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