Re: jesuit tree markers (properties wanted)
As with any research, there is a progression of facts that needs to be verified in order to ascertain the next step.
First the trees need to be specifically identified and then age certified to determine if they actually thrived prior to the dates of the Jesuits.
If the trees, in fact, are date correct, then the signs possibly would be applicable.
From looking at the bark, the first picture is a Leptospermum laevigatum commonly called the Australian Tea Tree. Usually a large shrub or small tree and is known to have trunk calipers up to 2' across. Although, long lived, they can obtain this size in 30 to 50 years, or so.
One hundred years maybe, however, 200 years may be doubtful for this species.
Not sure about the other trees and can certainly rule out the eucalyptus genus and species. All eucalypts have a narrow sickle-shaped leaf and the bark may range from smooth light tan colored (E. citridora) to dark reddish brown and deeply furrowed (E. ficifolia). The key is the leaf shape for this species which is in excess of 700 varieties, and not evidenced here. Also not long lived and succumbs to numerous native pests.
However, if the dates are off by any amount, then any research is null and void.
Need to verify the trees.