RHH's photos with the keyword: intrusion

Devil'sTower is a landmark in the northeastern Wyoming that has been a national monument since 1906. It is in the Black Hills area of South Dakota and Wyoming and is an old volcanic intrusion. We visited it last summer on our way across country, but found it very busy due the presence of thousand of bikers in the area for the annual Sturgis Motorcycle Rally. ronaldhanko-orchidhunter.blogspot.com/2011/10/eastern-wyo...