Scientific Investigations Report 2006–5316

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5316
DOE/ID-22201

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Table 1. Summary of composite stratigraphic units, thicknesses, and time spans as defined by Anderson and Liszewski (1997) and used in this study.

[Abbreviations: ft, foot; Ka, thousands of years; n.a., not applicable]

Composite
stratigraphic
unit name		 Number of
wells fully
penetrating
the unit		 Average
thickness of
the unit
(ft)		 Approximate
time span of
the unit
Ka)
1 300 62 5 – 250
2 170 108 250 – 350
3 140 163 350 – 440
4 143 137 440 – 515
5 112 126 515 – 580
6 68 107 580 – 650
7 13 283 650 – 800
8 - 14 n.a. n.a. 800 –1,800

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