Geology

Glacial Erratic 

This erratic sits calmly on the water's edge, the pinnacle of excitement at my observation site. As a deposit from the Vashon Glacial Ice Sheet (as referenced in Land-Use History), the ice that carried this stone would have had to swallow up one of the major rivers, such as the Nooksack, Skagit or Skykomish, in order to move down and meet up with the main glacial lowland lobes that carved Ravenna's ravine. Made of granodiorite, this stone resembles granite but is darkened in appearance by other types of minerals. The pockets of surface that emerge between the moss show crystalline features that shimmer in the sunlight. 

In the same generally vicinity as the more famous, "Wedgwood Rock," located in a nearby residential area, this glacial erratic has at home in the heart of Ravenna, serving as a facilitating structure for an abundance of mosses and lichens, and an exciting challenge for children in the park who favor climbing and adventure. Although the erratic has been partially normalized by my numerous visits to the site, it is a definitive marker on the surface of park, not quickly forgotten by any of its visitors. 

Citations:
Tucker, Dave. "Northwest Geology Field Trips." Northwest Geology Field Trips. N.p., 06 May 2011. Web. 10 June 2013.

"Your Local Guide to North Seattle Neighborhoods." North Seattle Guide RSS. N.p., n.d. Web. 10 June 2013.