microfossil 
noun
A fossil or fossil fragment that can only be seen with a microscope.Micropalaeontology is the study of microfossils, a microfossil being any fossil that is best studied by means of a microscope....
- A total of 772 samples have been analysed for microfossils from the proximal Cretaceous succession of the Orange Basin during the past 10 years.
- The key to understanding the early evolution of eukaryotes lies in the Proterozoic fossil record, especially microfossils.
- tracklayer
- tracklement
- trackless
- track lighting
- track lights
- tracklist
- tracklisting
- trackman
- trackpad
- trackpants
- track record
- track rod
- track shoe
- trackside
- track someone/thing down
- track something in
- track something up
- tracksuit
- trackway
- trackwork
- tract
- tractability
- tractable
- tractableness
- tractably