|Creatures of the Western Interior Seaway.|
|Shale layers; we mostly excavate|
in Boyne through Millwood.
There are several different shale layers that we find fossils in around Morden, each representing a period of time. These layers are usually quite different from each other, although certain layers are sometimes very similar (like the Millwood and the Upper Gammon that I've written about before). Changing composition of shale means that the conditions in the Seaway were changing as well. For example, a shale formation with high levels of bentonite indicate a lot of volcanic activity (bentonite is a common mineral formed from compressed volcanic ash). As well, fossils can have major differences in appearance depending on which layer they were formed in; fossils from the Pembina shale tend to be reddish-grey with fairly poor preservation, while Boyne fossils are black and shine gold in the sun. The Gammon Ferruginous can be extremely hard to dig through, but its fossils are likewise very well preserved.
|Attempting to sift through Millwood.|