Hi Charles, Thanks for sharing. I'm about 150 miles west of you. I make my own clay with the yellow stuff found on my property and single fire with wood on a spot dug out of a small hillside. Digging the clay and finding many types of rocks led me to study the geology of my area a little. Love finding the stuff the glaciers brought here! Hope to hear more from you. Thanks to everyone on this forum. I have learned so much from reading all the past posts.