This is a megascopic version of what may occur around porphyroblasts.
From the en.wikipedia.org
Petrographic descriptions start with the field notes at the outcrop and include megascopic description of hand specimens.
From the en.wikipedia.org
Megascopic cross-cutting relationships are features like igneous dikes, as mentioned above, which would be seen on an outcrop or in a limited geographic area.
From the en.wikipedia.org
More examples
Visible to the naked eye (especially of rocks and anatomical features)