Here is a detailed description of what Archelon might have looked like:
Size: Archelon was one of the largest sea turtles that ever existed. It had a massive, barrel-shaped shell that could grow up to 13 feet (4 meters) long and 8 feet (2.5 meters) wide.
Shell: The shell of Archelon was made up of thick, bony plates that were fused together. The top of the shell (the carapace) was domed, while the bottom (the plastron) was flat. The carapace was covered in a layer of scales that helped to protect the turtle from predators.
Flippers: Archelon had four flippers, each of which was about 6.5 feet (2 meters) long. The flippers were powerful and well-adapted for swimming. The front flippers were longer and more slender than the rear flippers, and they were used for steering and maneuvering. The rear flippers were shorter and more powerful, and they were used for propulsion.
Head and Neck: Archelon had a large head and a long neck. The head was equipped with a powerful jaw that was lined with sharp, serrated teeth. The teeth were used to crush the shells of mollusks, which were Archelon's primary food source. The neck was flexible, allowing Archelon to reach food that was out of its reach.
Overall Appearance: Archelon was a massive, powerful creature that was well-adapted for life in the ocean. It was a skilled swimmer and a voracious predator. Archelon is an important part of the fossil record and provides valuable insights into the evolution of sea turtles.