Ellie and I came across this archaeological dig in our neighborhood where the excavation has revealed several layers that allow you to see back in time across Portland’s geographic past. There’s the oldest layer on the bottom that dates from the Concrete Era. What creatures must have roamed the land back then! After that comes the brief Brick Era, followed by the Wood Era. Unfortunately the dig was accidentally left uncovered one night and has now been exposed to the modern era, the Moss Era.