ark shell (noun)

1. The presence of ark shell fossils in ancient marine sediment samples provides valuable information about the environmental conditions millions of years ago.

2. Why did the ark shell refuse to play hide and seek? Because it was too good at finding the perfect hiding spot with its boat-like shell!

3. In the animated series, the character collects ark shells on the beach during their summer vacation adventure.

4. The comic strip featured a funny storyline where the main character stumbled upon a giant ark shell on a deserted island.