By the end of the Jurassic Period, the Sundance Sea was filled up with sediments and formed a swampy lowland known as Morrison Foredeep
Panthalassa Moor
Franciscan Terrane
Great Black Swamp
Solenhofen Swamp

Morrison Foredeep

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.

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles