Answer:
The "good glass" to which the clue refer is actually a semi solid glass, which will be strong to cut the heat of the sun, yet be transparent and clear for viewing the outside sights
All of the fossils could be from fish,dinosoures,leaves, or plants. The reason why this could happen is because it could have happened thousand of years ago and the sea level could have been lower.
A work of literature could reflect something about a culture.For example the Bible,or the 10 Commandments as an example on how literature can reflect on a cultural perspective.