Simplify the following text for a Grade 7 native English-speaking person.
Original: Well-preserved fossils have been found in the 400-million year old Rhynie cherts of Scotland , which look surprisingly modern , indicating that the basic structure of the harvestmen has not changed much since then .
Simplified: Well-preserved fossils have been found in the 400-million year old Rhynie cherts of Scotland . The samples found look surprisingly modern .