Alright, so I noticed there isn't really a go-to form on the internet for asking permission from private property owners to collect on their land. So I compiled all the requests and suggested clauses from here:
and here
and here
and several other private property permission forms into one specifically for fossil, mineral, and rock collectors.
I put it all into these documents as a general cover-all forms.
FULL VERSION WITH HOLD COLLECTORS HARMLESS
Property Owner Permission and Liability Release Agreement.pdf
@DPS Ammonite's suggested version:
Property Owner Permission and Liability Release Agreement(updated).pdf
@Wrangellian's suggested version
PROPERTY OWNER PERMISSION AND LIABILITY RELEASE AGREEMENT one page.pdf
I hope this can be of use to those needing some kind of permission form for collecting on private land.
If you do not like it or don't think it covers anything feel free to edit it and post the edited versions here.