Answer:
Morrison Foredeep
Step-by-step explanation:
Morrison Foredeep is a swampy lowland formed due to filling of Sundance Sea with sediments during Jurassic period. Series of sedimentary rocks deposited during the Jurassic Period in the western North America, from Montana to New Mexico. Morrison Formation is famous for the presence of dinosaur fossils, which have been collected since 1877 about more than a century ago beginning with a find near the town of Morrison, Colorado.