Chinook Pass Cabin Owners Association     

2015 Field Trips


Saturday, August 29th: Geology  - Edgar Rock Volcano

LEADER: Dr. Paul Hammond Meet Up Location: Whistlin' Jack Lodge parking lot

Time: Noon

Erupted between 27.7 to 25.7 million years ago, an active volcano over about 2 million years. Volcano is cut in half by a major fault, a zone, which follows the SE-striking Naches River.

A question here: If the volcano was a major landform, why does the major stream in the area flow through the volcano and not around it? Flanks are warped, probably at about same time as volcano was faulted. Last structural deformation in region was between 5 and 10 million years ago.

Field trip will be in NE part of volcano, along roads WA 410 and FS 1703 and 1705. Trip will culminate along SE flank of Manastash Ridge. Total distance along roads will be about 30-35 miles. We’ll make between 8 and 12 stops. Roads are windy, slow going.

We’ll examine lava flows, interbeds of tuff (volcanic ash), some dikes or feeders to lava flows, fault zones and evidences of folding of the layered deposits. Composition of volcanic rocks is andesite to basalt. Common minerals in rocks, although small, are whitish plagioclase, black pyroxene of both augite and hypersthene, small occurrences of cat’s eye green olivine and yellowish-brown sphene.

If time is available, hardy troopers may hike fairly level trail #966 at end of road about 1/2-3/4 mile to overview of Devils Slide (landslide) in Milk Creek valley.

Bring rock hammers, collecting bags, hand lens, gloves, cap, dark glasses, blockout crème, binoculars; wear stout shoes.


Saturday, September 12th: Morse Creek Mining

Time: 10:00 am
LEADER: Tod Rossire
Meet-up Location:  SR 410  "Chain up" parking area between snow gate and bridge over Morse Creek
CONTACT: Carl Buchholz buchcs@aol.com or 509-966-4861

The field trip will be an introduction to Morse Creek and the Summit Mining District. Mining here started in the mid 1800's and is still active with today's hobby miners.

We will find mines, prospects, claims, artifacts, ruins, landmarks, and mystery since there is very little written history and few photographs. You'll have the chance to try to visualize what it was like it its "heyday."

High clearance vehicle a must. 4x4 even better. Carpooling best (narrow road, few turnouts) Walkie-talkies and binoculars helpful. We will be driving and hiking


Saturday September 19, 2015 Thundereggs & Plant Fossils!

Time: Noon
LEADER: Carl Buchholz
Meet-up Location: Kaner Flats Campground on the Little Naches Road. T
CONTACT: Carl Buchholz buchcs@aol.com or 509-966-4861

This is the same meet up  location and time as last year for people who have gone before. We will be going to another location where the thundereggs are smaller but have more colors in them than where we were last year. Some have green areas and red veins in them with crystalline quartz centers. We will also stop along the way and look at plant fossils in road cuts. These sites are right next to the roads, so there will be NO hiking like last year. The thundereggs are in loose soil at this location, so they are easier to obtain.

Tools to bring if you have them: rock hammer, shovel, trowel, a three prong scratching digging garden tool, containers like zip lock bags to collect into, we may try screening, so if you have a 1/4 inch hardware cloth screen bring it, some flat boxes like grapes are packed in to place large rocks and fossil in, some pieces of carpeting, rags, old towels, or newspaper to place between the rocks to protect them when packed in a box, gloves, knee pads are nice, water, and your lunch. You probably don't have all these things, but bring what you have. I have extra rock hammers and army shovels that you can borrow.

I think that this will be a good field trip for children, because it is easy digging and they can find some excellent thundereggs and fossils.


Saturday October 10, 2015: Fall Mushrooms! Cancelled!

The fall mushroom field trip slated for October 10th has been canceled. The fall rains have not been sufficient enough to stimulate the mushrooms to form their fruiting bodies. There are a few mushrooms in some wet areas next to streams or swampy areas, but there are not enough to have a field trip. Everybody would get lots of walking and very little or no mushrooms to take home.

We will continue to monitor the situation, and if there is enough rain and the weather stays warm enough, we could have a mushroom field trip later in October . We will let everybody know via email and on the web site (CPCOA.com) if there are enough mushrooms present to have the field trip later.

Time: Noon
LEADER: Jim Christensen, member of the Yakima Valley Mushroom Society
Meet-up Location: Intersection Highway 410 and Bumping River Road CONTACT: Carl Buchholz buchcs@aol.com or 509-966-4861

You can bring mushrooms that you have found for Jim to help you identify. Then we will drive to an area where the mushrooms are growing the best. At this time we do not know where this will be. This field trip will take place even if it is raining, so bring appropriate clothing.