This could be something like the erosion of areas of loess in South Limburg, a process that was started by the Romans, but that only in the 20th century led to extensive mudslides, making the land permanently unsuitable for agriculture. (sciencedaily.com)
No Tiljander (solid), original (dashed), loess smooth for clarity, for the three highlighted «OLS» curves in the original figure). (realclimate.org)
The grains, collected from loess, riverbeds, and sand dunes, ranged in size from 5 to 16 micrometers. (sciencedaily.com)