Last night we drove to Saint John in New Brunswick, Canada to take a quick look at Reversing Falls (more of that later). As we were admiring the overlook yesterday, Brett noticed a lithologic change in the rocks under the bridge over the Saint John River; notice the light-colored rocks at the center of the image, and the brown rocks to the right:
This afternoon I learned that this is the boundary between Avalonia and Laurentia; the brown rocks are Avalonian, while the light rocks are Proterozoic rocks from Laurentia.
We were invited to visit the collections of the New Brunswick Museum by Dr. Randall Miller, the Curator of Geology and Paleontology. This museum has an excellent fossil collection that includes numerous type specimens. Some highlights from the collection:
The telson (last segment) of the giant eurypterid Pterygotus:
And one of their most prized specimens, the oldest known articulated shark specimen, Doliodus problematicus. This specimen was described in Nature in 2003. It includes the cranium (top center) and the front part of the body, including the pectoral fin (I’ve slightly enhanced this image to make the shark more visible):
We’re back in Maine now and heading home, but I’ve got a backlog of pictures to post from this trip, so more is on the way.