diatoms
![photographs of diatoms](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/diatoms_fig2LG.jpg?itok=KQNCmDSc)
Detailed Description
The silica cell-wall, or frustule, of a diatom preserves well in most sedimentary environments and can be used in species identification. Since certain species exist only in specific habitats, the composition and quantity of diatoms can be used to figure out past environmental conditions.
Sources/Usage
Public Domain.