Storms rolled into the area last night (I took the photo above just before sunset), and continued to look bad this morning, so we took the day to head south, for a drive through Wind River Gorge and a tour of the Wyoming Dinosaur Center. Since I talked about these a bit last year, I’m not going to go into a great deal of detail, but there are some interesting geologic features in the canyon I didn’t discuss last year.

At one point along US 20, there’s a road cut where you can walk up to the boundary between the Proterozoic and Phanerozoic Eons. Admittedly, you can often see this boundary wherever you have Proterozoic igneous or metamorphic rocks exposed, but it’s always a rather neat experience to be able to simultaneously put your hands on rocks formed during different eons. The boundary is just below Tim’s hand:

The Proterozoic rocks are granites, which are overlain (unconformably) by Cambrian sandstones and conglomerates. The Cambrian rocks are filled with all kinds of interesting cross-bedding relationships:

Tomorrow it’s supposed to be clear, so we should be able to get back to the excavation.