I went to the river yesterday. My goal was to find enough flint to make a point. This is the river bank full of glacial till rocks. We’re on a moraine of the Wl glacier. The terminal moraine is about 12 mi south of here. Limestone bedrock is around 250’ down below the sand, clay and gravel the glacier brought down, sitting on top of it. The Mahomet-Teays aquifer flows in the gravel here. An underground river my well is tapped into. A virtual unlimited supply of water. The river has cut through the moraine and exposed the gravel.
Most of the rocks are igneous or metamorphic. Flint type rock is scarce. Several nodules looked promising.
I worked the last one when I got home. I managed to make a biface but it had a patch of limestone right in the middle of one side.
I figured that would be a fatal flaw, and it was.
Just too much soft material in there. I’ll have to give the other nodules a try. Better luck next trip!
I also spotted this dandy piece of porphyry. Unfortunately it’s a 40-50 lb rock and too heavy to carry out. I think it’s too big for my rock saw anyway.
I almost forgot the treasure I found. You never know what will come down the river. A brand new ATV tire on a rim!
Most of the rocks are igneous or metamorphic. Flint type rock is scarce. Several nodules looked promising.
I worked the last one when I got home. I managed to make a biface but it had a patch of limestone right in the middle of one side.
I figured that would be a fatal flaw, and it was.
I also spotted this dandy piece of porphyry. Unfortunately it’s a 40-50 lb rock and too heavy to carry out. I think it’s too big for my rock saw anyway.
I almost forgot the treasure I found. You never know what will come down the river. A brand new ATV tire on a rim!
Last edited:
