Some such forms may have been introduced late in the Silurian period, for the interesting discoveries of fossil insects in the Devonian of New Brunswick, by Messrs.
As to the tertiary Cockroaches we know very little, exceedingly few having been preserved, even in amber--that wonderful treasury of fossil Insects.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "fossil insects" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.