The size does not make a mound or not, it was the size of the tribe that made the mound or how many tribes used it. I have the 2nd largest mound 5mi from my home. It is a mound with two mounds on top of it, it is over 75yrds wide and 250yrds long, it had a plaza and two temple mounds, it's called Emerald mound. I will get some photos soon and post them, just over in La. is where the 2nd tallest mound was till it was pushed down for dirt to build a church, it was a 2 level mound with a cone shape top, it's called troyville. Never seen anything like it except when uncle sam had me take a little trip to Indonesia and south America. I have local mounds that are burial mounds no more than 15ft tall and 40ft long.