Shells Provide Deep-Time Look at Marine Habitats (image) Florida Museum of Natural History Share Print E-Mail Caption Researchers collected more than 50,000 modern and fossil shells to study how seagrass meadows changed over time. Dead mollusk communities, including these Chione elevata, are useful archives of how a habitat looked hundreds or thousands of years ago. Credit Natalie van Hoose/Florida Museum Usage Restrictions Please credit Natalie van Hoose/Florida Museum Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.