The record behind this sentence

Also mapped in this township at state scale: Yamhill Formation and related rocks (Ty), Middle Eocene to Late Eocene; siltstone.

The record says

What it says

Also mapped in this township at state scale: Yamhill Formation and related rocks (Ty), Middle Eocene to Late Eocene; siltstone.
Our reading: worked out from the record, not copied from it.

What the index lists

Sedimentary, clastic

Miller, R.J., Raines, G.L., and Connors, K.A., 2002, Spatial digital database for the geologic map of Oregon: Geology compiled by G.W. Walker and N.S. MacLeod, USGS Open-File Report 03-67, scale 1:500,000.

About

The region

Source

U.S. Geological Survey state geologic map

Dates

Retrieved Oct 8, 2026

Note

State-scale compilation: USGS: "intended for use at approximately 1:1,000,000 scale or smaller" (USGS_SGMC_Metadata.xml useconst).

Cite as

Horton, J.D., 2017, The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States (ver. 1.1, August 2017): U.S. Geological Survey data release, online at doi.org. Online at ngmdb.usgs.gov. Retrieved Oct 8, 2026.

Open at the source That’s wrong