From staff in one of several previous similar conversations (bolding mine):
As cool as archaeological and geological finds are, iNaturalist’s focus is on users sharing their observations of recent, wild organisms and it’s not really the place for uploading observations of other things. To make it an ever expanding platform for archaeological finds, artifacts, geology, etc., would blur the focus of the site and make it significantly more difficult to run. A few fossil uploads here and there (properly marked as not recent evidence) are fine, but it would be better to find or create other platforms specific to those types of finds (eg rockd.org rather than shoehorn them onto iNaturalist. iNaturalist code is open source so it could be theoretically adapted to create such platforms.
From the Data Quality Assessment description:
