The Indians here seemed to like translucency....honey amber and  rootbeer predonimates....I have a couple of dozen hammerstones, a metate, few pecking stones, palettes, preforms and a handful of  darts.....my sample here at the house will give you an idea of the place..... hundreds of firepits to heat flint and dinner. Many of the flint cobbles that we find still in place in a firepit have coarse texture on the cortex...this tells me they were not found in the creek, 
they were not tumbled and polished..... hence they are better for working and heat treating....

There must have been a big erosional cutbank that revealed a huge gravel bed filled with quartzite cobbles and thousands of flint cobbles....this is the site where the flint for the Walnut Biface came from.