Hey, hey, hey, I am Conglomerate. I'm so so so happy you walked over here. People overlook me all the time, but I am technically full of rocks, so I don't know why people forget me. To be completely honest, before I got added to this cement, I used to spend all of my time down at the creek. If you walk down into the creek, you will meet so many cool rocks! Let me know if you run into Chert because we haven't seen him in a few days.
While concrete is not a rock, this specific masonry prominently features a conglomerate of rocks. After the concrete was poured, the top was sanded reveal the aggregate.