Pausanias gives this account of the omphalus at Delphi.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference

An oracle was given to Pelias in Thessaly: and whence did it proceed? from the well wooded omphalus of his mother Earth.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference

It is observable, that this historian does not mention an omphalus: but says, that it was a statue, ξοανον, which was carried about.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference

Jupiter Ammon was esteemed of the highest antiquity, and we are informed that there was an omphalus here; and that the Deity was worshipped under the form of a navel.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference

In respect to the omphalus of Ammon, which Curtius has translated umbilicus, and garnished with gold and jewels, the whole arises from a mistake in terms, as in the many instances before.    From Wordnik.com.  [A New System; or, an Analysis of Antient Mythology. Volume I.] Reference