@sherry-mathew are you in Kent Crippen’s class? This looks like material from the Aurora matrix. Here’s what you’ve got:
- Clam shells
- Clam (possibly oyster) shells
You may be able to identify some of the clams. Try going to http://www.fossilguy.com and looking at the identification guides for Maryland and Virginia. The fossils from there are similar to the ones from Aurora.