Accretionary Wedge #58: Signs of Doherty Grade

Evelyn has turned her geological road signs meme into Accretionary Wedge #58. I don't have a lot of signs photographed, though I am starting to accumulate some of roadside interpretive signs. But the following is my favorite, and a crop is featured as the header on my Twitter profile. Driving east out of Lakeview, Oregon on Route 140, about 45 minutes out, one crosses Guano Valley, just north of the Nevada-Oregon Border. On the first visit, one realizes with stomach-churning uneasiness that the road goes right up to an enormous cliff... then up it.

Taken during 60 mph reconnaissance geology, with Dana Hunter at the helm, you can see the lighter stripe of the road grade climbing the side of the Basin and Range escarpment. The road is actually very well engineered, and there's more berm than you realize, but the sheer drop off and lack of a guard rail can make it feel more like you're driving up a balance beam than a two-lane road. The first trip up Doherty Grade is definitely a memorable experience. Heading into the turn at the base...

...feels a little like reaching the first crest of a big roller coaster. "Dear Lord, what have I got myself into!?" Then just after starting the grade proper, they decided to reassure nervous drivers that, yes, it could be worse. After all, you're driving up a cliff, and rocks do fall off cliffs, right?

It's not terribly obvious at this scale, but just beyond the "Rocks" sign is also what I refer to as the "pointy-headed snakes" warning (winding road).

And yes, there is a pull-out about a mile or so into this climb that I like to stop at. Fortunately, there's not much traffic on this road: it's on the inside of a curve, across oncoming traffic. I've posted a ginormaous panorama of Doherty Rim at Flickr; right-click the image for viewing size options. Guano Valley is notable as the source of the USGS Andesite "AGV-1" geochemistry standard, though I don't think it's available any more, and I've never been able to figure out exactly where it was collected.

Geo 365: July 15, Day 196: Bioturbation

Bioturbation, probably feeding traces/burrows, in a siltstone or fine grained sandstone in the south cove of Devils Punchbowl State Park, Oregon. This is a loose boulder, but it's certainly from the cliffs nearby, which are composed of the Miocene Astoria Formation.

Photo unmodified. July 2, 2013. FlashEarth location.

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Geo 365: July 14, Day 195: A View to Thrill

On the first day of Chris and Anne's visit, we did a quick buzz up Marys Peak. The view to the east and over the Cascades was not as clear as it had been a week earlier with the OMN workshop, but with the sunglint off the ocean, shortly before sunset, the view to the west was glorious. The bright strip of the Pacific Ocean hits the horizon at a distance of about 75 miles, or right about where the Juan de Fuca Plate begins its slide under the edge of North America. It's about 25 or 30 miles under our feet here.

Photo unmodified. July 1, 2013. FlashEarth location.