Is it true that sea shells have been found in deserts?

That's because deserts have not always been deserts . An excerpt : At different geological depths were found fossil algae that confirm that 150-200 million ago, during the Jurassic (the middle dinosaur era), Sahara was covered by an ancient sea, which was in some places 5,000 m (15,000 feet) deep. read more

Sea shells are the hard outer covering, or exoskeleton, of certain mollusk species. These include your bivalves like clams, mussels, and scallops, as well as gastropods, which are snails. An example of a bivalve shell is the large white shell of sea clams often used as ashtrays. read more

“I have come to surmise that in olden times the sea spread over all the land, and in some of the great recessions which histories tell us about, it left these salty and sandy wastes uncovered. Indeed one finds on the way many piles of oyster shells, mixed with earth and half buried, and other shells and maritime signs. read more