“....This deposit is now in the Mill Creek Wilderness and collecting is not allowed. The eggs from here are, in my opinion, some of the most beautiful to be found in the Ochocos. The matrix is usually a tan and cream mottled color, and the agate cores commonly have shades of yellow, blue and sometimes reddish/brown. They almost always have fortification type banding, and occasionally contain moss or plumes. ..”

extract of the article from Mark Ketsdever, Hillsboro, 2007 :”Thunderegg Agates of the Ochoco Mountains, Oregon, USA