Obsidian question and Id

Agree Jason. The mossy and plumy agates found at the lower section of the Rio Grande are a Heinz 57 mix washed down from a long and varied upstream source. Anyway, the whole mess of heavily rounded agates/woods/jaspers/palms is cased in volcanic ash based 'cement' called caliche to make a deep sedimentary deposit for many miles. Find the white caliche and you are in the agate business, a no brainer. Many gravel quarries along the massive deposit dig them and sell them for road gravel, larger cobbles sold as rip-raff. Find graveled roads or graveled landscape beds and start collecting. Oddly few go there to collect,the Hispanic population there seems to have no interest in fine rocks but they are glad to have you collect on their ranches. Kind and generous folks down there.