I spent some time looking through this Bottle dating website. Eventually I found this PDF file that has a list of all the bottle base markings. Looks like that bottle is from the Hillsboro Glass Co. (1961-1997). 1976 would be my guess. That could be the date of the rock alignment too, if they were found right next to each other.
Some of those hills/mountains in your photos are just BEGGING to be climbed. How can you deny them?!
Some of those hills/mountains in your photos are just BEGGING to be climbed. How can you deny them?!