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Scientific Investigations Report 2009–5208

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Shallow Groundwater Movement in the Skagit River Delta Area, Skagit County, Washington

Table 1. Hydrogeologic characteristics of simplified geologic units used in this study and correlation with previous unit designations.

[Geologic units used in this report are simplified and are from Schuster (2000). Symbol: –, not applicable]

Period Epoch Hydrogeologic
characteristic
of units		 Simplified
geologic units		 Geologic units
Quaternary Holocene to Pleistocene Alluvial and Recessional Outwash Aquifer Qago Qac, Qas, Qf, Qvlk, Qgom
Pleistocene Till Confining Unit Qgt Qp, Qls, Qgdme, Qgt
Advance Outwash Aquifer Qga Qga, Qgas
Tertiary Oligocen to Eocene Sedimentary Bedrock Aquifer OEc OEcb, Ecc
Cretaceous to Jurassic – Igneous and Metamorphic Confining Unit KJ KJvcf, KJmsg, KJmvg

For additional information contact:
Director, Washington Water Science Center
U.S. Geological Survey, 934 Broadway — Suite 300
Tacoma, Washington 98402
http://wa.water.usgs.gov

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