Trask Mountain

Trask Mountain in the Northern Oregon Coast Range, is the tallest mountain in Yamhill County, Oregon.[4] It is located in the northwest corner of the county.[5] Evidently the mountain was named for Elbridge Trask who settled west of the peak in Tillamook County in 1852.

Trask Mountain
Trask Mountain
Highest point
Elevation3,426 ft (1,044 m) NAVD 88[1]
Prominence3,424 ft (1,044 m)[2]
ListingOregon county high points
Coordinates45°22′16″N 123°27′21″W[1]
Geography
LocationYamhill County, Oregon, U.S.
Parent rangeNorthern Oregon Coast Range
Topo mapUSGS Trask Mountain
Climbing
Easiest routeTrask Toll Road to just below the summit.[3]

Geology

The mountain is composed of mainly volcanic rock with some sedimentary rocks.[6] Like much of the northern section of the Oregon Coast Range, the origins began around 40 million years ago during the Eocene period. During this era, sandstone and siltstone formed in the area.[7] Additionally, igneous rocks and basalt flows combined with basaltic sandstone to create many of the mountainous formations. The volcanic rocks come from basalt flows that originated from fissures in the central portion of Oregon and covered much of the state.[8] Additional sedimentary rock was formed more recently, around 20 million years ago.[7]

All of the coast range lies over a convergent tectonic margin interacting with the