It turns out that the Romans used geotextiles when they built their roads across boggy areas. Geotextiles are necessary in that situation to keep your gravel from simply squishing into the mud, never to be seen again. Modern roadbuilders use geotextiles made from plastic or fiberglass. But a number of people over the years have used fleece, including railroad builders. And now some trailbuilders in Ireland are using that method to rebuild a trail in a peat bog. They get good results with far less embedded energy.