Sudbury Day Two

Greeting,

I think the most important thing I learned today is that Canadians make awesome donuts, especially at Tim Hortons!

One thing that strikes me about studying the impact site is how complex the geological history here is. Everything I have studied so far in class about geology is clear cut. Because this site is so old and because it has had many events take place here, it is very difficult to come to a definitive conclusion about the order and magnitude of the geologic events that took place here. The first stop we made today did help with this. The picture I posted shows a cross cutting dike, the dark line through the light granite. This shows that the basalt dike intrusion came after the granite formation, this is from the law of superstition. The outcrop we looked at showed two rock formations of granite and basalt, but this dike defiantly showed that the basalt cut the granite, as opposed to the opposite way around. Information such as this can help determine the sequence and history of the site, and help determine the size of the impacting meteorite.

Stephen