Pillow Lava
This location is the site of a landslide that happened in early 2016 that exposed unique basalt formations called pillow lava, or pillow basalt. Parking is available just to the north of the slide on the river side of the road.
Pillow lavas are bulbous, spherical, or tubular lobes of lava. They form during eruptions with relatively low effusion rates. Slow extrusion gives enough time for a thick crust to form on all sides of a pillow lobe, and prevents individual pillows from coalescing into a sheet. Internally the pillows are fed via a distributary system of interconnected channels. Pillows are not typically hollow and tend to solidify all the way through. They generally solidify under water, often having a characteristic structure comprising a series of close-fitting pillow-shaped masses. This makes sense, considering the west coast of North America was not always here. 
QUESTIONS:
1. At this location, you can see solid pillows, but also holes were the pillows may have been. Were these places hollow originally? If not, surmise how the pillow indentation came to be. Was it a cause of the landslide or something else? Think outside the box and don’t be afraid to get creative (within scientific reason).
2. If this is not a form of pillow basalt, what other formation might it be?
3. Because pillow lava is typically formed under water, what does that lead you to believe about this area of Oregon (or the west coast)?
4. Please post a photo of yourself (optional, but desired) at the site as further proof of your geological expedition!