<Li> At the same time, much of the low plains of modern - day northern France and northern Germany were inundated by an inland sea, where the chalk was deposited that gave the Cretaceous Period its name . </Li> <Li> The Amazon, originally emptying into the Pacific, as South America rifted from Africa, found its exit blocked by the rise of the Andes about 15 million years ago . A great inland sea developed, at times draining north through what is now Venezuela before finding its present eastward outlet into the South Atlantic . Gradually this inland sea became a vast freshwater lake and wetlands where sediment flattened its profiles and the marine inhabitants adapted to life in freshwater . Over 20 species of stingray, most closely related to those found in the Pacific Ocean, can be found today in the freshwaters of the Amazon, which is also home to a freshwater dolphin . In 2005 fossilized remains of a giant crocodilian, estimated to have been 46 ft (14 m) in length, were discovered in the northern rainforest of Amazonian Peru . </Li> <Li> In Australia, the Eromanga Sea existed during the Cretaceous Period . It covered large swaths of the eastern half of the continent . </Li>

What is the only totally inland sea that is identified