@ehBeth,
You oughta go over to lake Erie near Windsor Theres an area of gravel that contains agates and jasper from the lower shiled .Stuff was smooshed by the glaciers down the way from NE to SW . What you do is look at all the glacier scratches in the rock and follow it SW (lake E will be on yer left) Just walk along the gravel beds , not sandy beaches.
We used to find puddinstones that you could turn into jewelry . Ill see if I cant find a picture . Sounds like you guys take walks and this gives ya something to do besides taking pictures of saw whet owls. (not that theres anything wrong with that)