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Foreword Robert J. Creed and Trish St. Clair		1
Section I.- Geologic Framework
1.	Introduction to the hydrogeology of the eastern Snake River Plain Roy C. Bartholomay, Linda C. Davis, and Paul Karl Link	3
2.	Pliocene and Quaternary stratigraphic architecture and drainage systems of the Big Lost Trough, northeastern Snake River Plain, Idaho Jeffrey K. Geslin, Paul Karl Link, James W. Riesterer, Mel A. Kuntz, and C. Mark Fanning	11
3.	Paleoenvironments of sedimentary interbeds in the Pliocene and Quaternary Big Lost Trough, eastern Snake River Plain, Idaho Erick A. Bestland, Paul Karl Link, Marvin A. Lanphere, and Duane E. Champion	27
4.	Subsurface volcanology at Test Area North and controls on groundwater flow Dennis J. Geist, Rachel A. Ellisor, Elisa N. Sims, and Scott S. Hughes	45
Section II.- Sedimentary Systems
5.	Sedimentologic and hydrologic characterization of surficial sedimentary facies in the Big Lost Trough, Idaho National Engineering and Environmental Laboratory, eastern Idaho Linda E. Mark and Glenn D. Thackray	61
6.	Late Quaternary highstands in the Mud Lake and Big Lost Trough subbasins of Lake Terreton, Idaho Gary L. Gianniny, Glenn D. Thackray, Darrell S. Kaufman, Steven L. Forman, Michael J. Sherbondy, and Delda Findeisen	77
7.	Holocene paleoflood hydrology of the Big Lost River, western Idaho National Engineering and Environmental Laboratory, Idaho Dean A. Ostenaa, Daniel R.H. O'Connell, Roy A. Walters, and Robert J. Creed	91
Section III. Volcanic Rift Zones and Basalt Accumulation
8.	Tension cracks, eruptive fissures, dikes, and faults related to late Pleistocene-Holocene basaltic volcanism and implications for the distribution of hydraulic conductivity in the eastern Snake River Plain, Idaho Mel A. Kuntz, Steven R. Anderson, Duane E. Champion, Marvin A. Lanphere, and Daniel J. Grunwald	111
9.	Morphology of inflated pahoehoe lavas and spatial architecture of their porous and permeable zones, eastern Snake River Plain, Idaho John A. Welhan, Chad M. Johannesen, Kelly S. Reeves, Thomas M. Clemo, John A. Glover, and Kenneth W. Bosworth	135
10.	Geochemical correlations and implications for the magmatic evolution of basalt flow groups at the Idaho National Engineering and Environmental Laboratory Scott S. Hughes, Michael McCurry, and Dennis J. Geist	151
11.	Accumulation and subsidence of late Pleistocene basaltic lava flows of the eastern Snake River Plain, Idaho Duane E. Champion, Marvin A. Lanphere, Steven R. Anderson, and Mel A. Kuntz	175
12.	Open-system evolution of a single episode of Snake River Plain magmatism Dennis J. Geist, Elisa N. Sims, Scott S. Hughes, and Michael McCurry	193
Section IV. Groundwater Studies
13.	Chemical characteristics of thermal water beneath the eastern Snake River Plain Travis L. McLing, Robert W. Smith, and Thomas M. Johnson	205
14.	Genesis of alteration of Quaternary basalts within a portion of the eastern Snake River Plain aquifer Lee H. Morse and Michael McCurry	213
15.	Stochastic simulation of aquifer heterogeneity in a layered basalt aquifer system, eastern Snake River Plain, Idaho John A. Welhan, Thomas M. Clemo, and Edith L. Gégo	225
16.	Modeling groundwater flow and contaminant transport in the Snake River Plain aquifer: A stochastic approach Edith L. G&eaute;go, Gary S. Johnson, Matthew R. Hankin, Allan H. Wylie, and John A. Welhan	249
17.	Recirculating tracer test in fractured basalt Robin E. Nimmer, Dale R. Ralston, Allan H. Wylie, and Gary S. Johnson	263
Section V. Bioremediation Studies
18.	Characterization of microbial isolates from the Idaho National Engineering and Environmental Laboratory Test Area North aquifer: Identifying potential enzymatic pathways for toluene oxidation Mary E. Watwood, William K. Keener, and William A. Smith	279
19.	Effect of basalt heterogeneity on intrinsic bioremediation processes in groundwater Allan H. Wylie, Dale R. Ralston, and Gary S. Johnson	287
Index		297
GSA Data Repository Item 2002041: Identification of basalt interflow zones with borehole geophysical and video logs at the Idaho National Engineering and Environmental Laboratory, Idaho: John A. Glover, John A. Welhan, and Linda L. Davis.