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Oregon Water Science Center

Columbia River Basalt Stratigraphy in Oregon

In Cooperation with the Oregon Water Resources Department (OWRD)

Table of Geologic Units for Site CLAC 20274

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USGS Site ID: Site identification number permanently assigned to the well by the U.S. Geological Survey and recorded in National Water Information System (NWIS), a national computer database maintained by U.S. Geological Survey.

Sequence Number: Sequence number assigned to identify a record.

Depth to Top of Interval: The depth to the top of this unit, in feet below land surface.

Depth to Bottom of Interval: The depth to the bottom of this unit, in feet below land surface. This field should be specified for all units, except the last one in the hole.

Unit code: The name of aquifer or geologic unit stored by the U.S. Geological Survey in National Water Information System (NWIS), a national computer database maintained by U.S. Geological Survey.

Lithology code: The principal lithology of this unit stored by the U.S. Geological Survey in National Water Information System (NWIS), a national computer database maintained by U.S. Geological Survey.

Description of material: The adjective modifier to describe the rock type.

--, no data/unknown.

USGS Site ID Well Log ID Sequence Number Depth to Top of Interval Depth to Bottom of Interval Unit code Lithology code Description of material
451611122324501 CLAC 20274 1 0 60 BORING LAVA Basalt --
451611122324501 CLAC 20274 2 60 1260 TROUTDALE FORMATION Sand, Gravel, and Clay --
451611122324501 CLAC 20274 3 1260 1320 BASALT OF SENTINEL GAP OF FRENCHMAN SPRINGS MEMBER OF WANAPUM B Basalt flow 1
451611122324501 CLAC 20274 4 1320 1350 BASALT OF SENTINEL GAP OF FRENCHMAN SPRINGS MEMBER OF WANAPUM B Basalt flow 2
451611122324501 CLAC 20274 5 1350 1365 ELLENSBURG FORMATION Claystone --
451611122324501 CLAC 20274 6 1365 1440 BASALT OF SILVER FALLS OF FRENCHMAN SPRINGS MEMBER OF WANAPUM B Basalt FLOW 1
451611122324501 CLAC 20274 7 1440 1480 BASALT OF SILVER FALLS OF FRENCHMAN SPRINGS MEMBER OF WANAPUM B Basalt FLOW 2
451611122324501 CLAC 20274 8 1480 -- BASALT OF SILVER FALLS OF FRENCHMAN SPRINGS MEMBER OF WANAPUM B Basalt FLOW 3
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Page Last Modified: Wednesday, 09-Jan-2013 18:44:07 EST