Science, Tech, Math › Animals & Nature The Dinosaurs and Prehistoric Animals of Maine Share Flipboard Email Print Animals & Nature Dinosaurs Basics Paleontologists Carnivores Dinosaurs & Birds Herbivores Marine Reptiles Prehistoric Mammals Amphibians Birds Habitat Profiles Mammals Reptiles Wildlife Conservation Insects Marine Life Forestry Evolution View More By Bob Strauss Science Writer B.S., Cornell University Bob Strauss is a science writer and the author of several books, including "The Big Book of What, How and Why" and "A Field Guide to the Dinosaurs of North America." our editorial process Bob Strauss Updated April 20, 2017 01 of 03 Which Dinosaurs and Prehistoric Animals Lived in Maine? A brachiopod fossil, of the type common in Maine. Wikimedia Commons Maine has one of the sparsest fossil records of any region in the U.S.: for a whopping 360 million years of its prehistory, from the late Carboniferous period to the very end of the Pleistocene epoch, this state was completely devoid of the types of sediments that preserve evidence of animal life. As a result, not only have no dinosaurs ever been discovered in the Pine Tree State, but neither have any megafauna mammals, since Maine was covered by impenetrable glaciers until about 20,000 years ago. Even still, there are some traces of fossil life in Maine, as you can learn by perusing the following slides. (See an interactive map of dinosaurs and prehistoric animals discovered in the United States.) 02 of 03 Early Paleozoic Invertebrates Fossilized brachiopods. Wikimedia Commons During the Ordovician, Silurian and Devonian periods--from about 500 to 360 million years ago--what was destined to become the state of Maine was mostly under water (it also happened to be located in the southern hemisphere; the earth's continents have drifted a long way since the Paleozoic Era!). For this reason, Maine's bedrock has yielded a rich diversity of small, ancient, easily fossilized marine animals, including brachiopods, gastropods, trilobites, crinoids and corals 03 of 03 Late Cenozoic Invertebrates Neptunea, a fossil mollusk of Maine. Maine Geological Survey Most every other state in the union (with the obvious exception of Hawaii) bears some evidence of mammalian megafauna like Saber-Toothed Tigers or Giant Sloths, usually dating to the end of the Pleistocene epoch, about 12,000 years ago. Not Maine, unfortunately, which (thanks to its deep layers of impenetrable glaciers) hasn't yielded as much as a single Woolly Mammoth bone. Instead, you'll have to content yourself with the fossils of the Presumpscot Formation, which consist of 20,000-year-old species of barnacles, mussels, clams and scallops.