Which preposition to use with rockwork

of Occurrences 1%

The pretty pavilions with their upturned roofs remained; the ornamental rockwork of the courtyards, the doors shaped like gourds or leaves or full moons, were left untouched.

on Occurrences 1%

We obtained access to two enclosures, forming part of the Imperial Palace appendages: both elevated places, the one ascended by a pathway in regular Chinese rockwork on a large scale, and really striking in its way; and the other being a well-wooded park-like eminence, crowned by temples with images of Buddha.

Which preposition to use with  rockwork