The Freeport Formation is a geologic formation in Pennsylvania and Ohio. It preserves fossils dating back to the Late Pennsylvanian period.[2] It is within the Allegheny Group.

See also

References

  1. ^ Rogers, H. D., 1840, Fourth annual report of the geological survey of the state of Pennsylvania. Harrisburg, PA, 215 p. ([1])
  2. ^ Freeport, National Geologic Map Database, Geolex — Unit Summary.


Allikas: https://en.wikipedia.org/wiki/Freeport_Formation
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