“.. One of the few areas in the Ochocos where the eggs are jasper filled rather than agate filled. ...Some of the specimens from here can be quite large and have many chambers of different colored jaspers (or agates). The matrix is normally a very light creamy color. This area is a free digging location..”
extract of the article from Mark Ketsdever, Hillsboro, Oregon, 2007 :”Thunderegg Agates of the Ochoco Mountains, Oregon, USA”
The agates from this place are colored light blue with a white fortification -banding. They are showing in their pattern very often the gravitational-type of agate (“water-level-agate”).