Final answer:
The Hudson Bay Lowlands were formed during the Pleistocene epoch, part of the Quaternary Period, which began about 1.8 million years ago, and not during the much older Paleozoic Era.
Step-by-step explanation:
The Hudson Bay Lowlands were formed during the Pleistocene epoch, which is part of the Quaternary Period. This period began about 1.8 million years ago and is known for its series of ice ages. It is not part of the Paleozoic Era, which is much older and lasted from 541 to 252 million years ago. The Cenozoic Era follows the Mesozoic and contains the Quaternary Period. During the Pleistocene, large parts of the Earth's water were locked up in ice sheets, and glacial processes shaped the geography, leading to the formation of the Hudson Bay Lowlands.