If fossils of a water animal or plant are found in a place then that place used to be covered by water in the past.
Graptolites , in deep-water deposits, are the dominant fossils.
If graptolites are found in a place then that place used to be covered by water.
what are found in place to indicate a place used to be covered by water?

  * mussels
  * Sea urchins
  * Conifers
  * patch reefs
  * graptolites
  * loose dirt
  * cartilage
  * Sediment