Garland:
Langford and Moreau had their hand in something like 250 courses, according to fairly well-respected research, and some of those are NLE or somewhat undocumented. I've only played or visited just a handful of L/M courses, and none of them could be considered quarry sites (nor some of the ones subject to GCA threads/articles, such as Culver Academies, Kankakee, Wakonda, Harrison Hills).
Having said that, those guys did move a ton of dirt on their projects, and on some courses that I've played, I've wondered if some of the sharp dips in the terrain of the course was existing landforms, or the result of some of L/M's digging (the little pond that fronts the pushed-up green at the wonderful par 5 4th hole at Spring Valley comes to mind, and I've always wondered about the sharp dip on the back nine at Lawsonia -- a pond to cross on the tee shot of the par 4 15th, as well as the ravine to cross on the tee shot of the par 5 11th and the sharp drop before the green on the par 5 13th).