Portland Formation
The Portland Formation is a geological formation in the northeastern United States. It dates back to the Early Jurassic period. The formation consists mainly of sandstone laid down by a series of lakes and the floodplain of a river. The sedimentary rock layers representing the entire Portland Formation are over thick and were formed over about 4 million years of time, from the Hettangian age to the late Hettangian and Sinemurian ages.Vertebrate fauna
Dinosaur coprolites located in Massachusetts, USA. Ornithischian tracks located in Massachusetts and Connecticut, USA. Theropod tracks located in Massachusetts and Connecticut, USA. Prosauropod tracks located in Massachusetts and Connecticut, USA.
