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  • MOUNT BAKER: Eruptive history, hazards, research.

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    Northwest Geology Field Trips, by Dave Tucker, is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 United States License. You can use what you find here, repost it with attribution to the author, "remix" it for your own purposes, but may not use it with the intent of making money off of it.

    EDUCATORS: Please feel free to use anything you find here that is useful to your mission educating people about Earth science. E-mail me if it would help to have a larger or higher-resolution version of any of the images. tuckerd at geol dot wwu dot edu

Field Trips

Find a trip, click, and go!

The entire list is visible on the right side of this (and every) page by scrolling down. Field trips are arranged geographically under the “Field Trip Locations” main page tab.

A primer on using map coordinates is here.

British Columbia:

Harling Point erratics and migmatite, Oak Bay, Vancouver Island

Westsong Way and Songhees Point, Victoria.

Dallas Road waterfront trail, Victoria.

-Capricorn Creek’s giant mudflow of September 2010 is initially described here, and later updated here.

Whidbey Island: A series of trips to see Pleistocene glacial stratigraphy

Glacial erratics in the Salish Sea region are listed as a group, from Vancouver BC south, as well as Hood Canal. This set of trips visits large, unusual, or particularly significant erratics only. This link goes to the online inventory of glacial erratics is maintained by UW students.

Chuckanut formation geology (regardless of location):

Field trips to cool places in the Chuckanut Formation, including the large 2009 Racehorse Creek landslide, and fossils found there.

Lowlands of Whatcom County:

-A short beach walk at Whatcom County’s Point Whitehorn Marine Reserve to see till, erratics, and nice island views.

San Juan Islands:

West Beach, Lummi Island; alternating thin beds of sandstone and conglomerate (Chuckanut Fm.) on a nice beach.

Pillow lava on San Juan, Lopez, and Cypress Islands

Iceberg Point, Lopez Island.

Washington Park, Fidalgo ophiolite, Part I. A piece of the mantle.

Mount Erie and environs, Fidalgo ophiolite Part 2. A section of the ocean crust.

Western foothills of the North Cascades.

-Rock Trail, Larrabee State Park. Sandstone stratigraphy, tafoni weathering, landslide blocks.

Fragrance Lake Trail, Larrabee State Park; discussion of quartzite pebbles in glacial till.

Oyster Dome on Blanchard Mountain ( “South Chuckanut Mountain”).

a stilpnomelane and chert deposit on Blanchard Mountain

Greenstone of Bald Mountain and Big Rock, east of Mount Vernon

-roadside pillow basalt in the Middle Fork Nooksack, Whatcom County.

-greenstone and phyllite on Burlington Hill, at Burlington in Skagit County.

Gold Mine Trail, Sumas Mountain: basal Chuckanut Fm and relics from a mining scam.

Cascade Mountains (excluding Mount Baker- see Mount Baker below):

Blue Lake Trail (Washington Pass, Hwy 20). Granite, and the rocks it intruded.

Hidden Lakes Peak: granodiorite, dikes, schist, ash deposits. Oh, and views!

-The huge 2400 year old Church Mountain landslide in the North Fork Nooksack River at Glacier, Washington.

Wells Creek Volcanics, near Nooksack Falls, North Fork Nooksack River

Excelsior Trail from the Nooksack River

-Excelsior Pass via the Damfino Lakes Trail

-Thick accumulation of Mazama ash alongside Highway 20, Skagit River valley

-Intrusive breccia of the Pollywog agmatite along highway 20, east of Ross Lake.

-The Baker River Trail: metamorphosed ocean basalt (greenschist), alluvium, waterfalls, cobbles in streams

Dickerman Mountain above the South Fork Stilliguamish. Old Cascade volcanic rocks and alpine views.

-the old limestone quarry above Concrete, Skagit valley

-short walk to phyllite east of Saxon, Whatcom County

Mount Baker geology guides:

Ridley Creek Trail – glacial moraines, limestone, lahar and ash deposits, pre-Baker lava, views of Twin Sisters and Mount Baker. Published July 15, 2015.

Cougar Divide hike– felsic rocks from the Pleistocene

-The Schreiber’s Meadow cinder cone

-The Pinus andesite lava, above Nooksack Falls, North Fork Nooksack

-A published GSA field trip guide to some Mount Baker Holocene deposits in the Baker River valley.

Olympic Peninsula

Pillow lava along the Heart O’ The Hills Road, Olympic National Park.

-A beach walk on Marrowstone Island to see an intrusive dike, Pleistocene glacial deposits, and coastal erosion

-Adakite lava and breccia of Tamanowas Rock, west of Chimacum in Jefferson County.

-Unconformities and turbidites at Beach 4, Olympic National Park.

Southwest Washington

Fantastic pillow lava at Cape Disappointment State Park

Where to collect nice black augite crystals in Lewis County

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