Original sentence: On the other hand, the only other effigy mound in Ohio, the Alligator Effigy Mound in Granville, was also carbon dated to the Fort Ancient period.Scholars believe it was built by the Fort Ancient culture about 1070 CE for ceremonial and calendrical purposes.The third date, ca 2900 BP was recovered from a core sample well below the prepared surface on which the mound was originally constructed.The third dates the mound back to very early Adena culture or before
Edited sentence: Another effigy mound in Ohio, the Alligator Effigy Mound in Granville, was also carbon dated to the Fort Ancient period; while another mapped in Butler County, Ohio, depicting a large boar, can be star-dated to abount 5,000 years ago.As noted, the third dates the mound back to very early Adena culture or before.Only a few scholars believe it was built by the Fort Ancient culture about 1070 CE in that it is probably considerably older.The third date, ca 2900 BP was recovered from a core sample well below the prepared surface on which the mound was thought to have been constructed, showing either the mound was created by a Late Archaic people, such as the Adena, or that an alternative method of dating should be sought to avoid further confusion