| Popis: |
The Black Ven-Spittles landslide is an old, probably Pleistocene, complex of interacting coastal landslides that are in the process of being reactivated as a result of a combination of man-made works and marine erosion. The upper part of the complex is underlain by Cretaceous rocks and the lower part by the Jurassic Charmouth Mudstone Formation. Large-scale rotational and translational failures have occurred in the Cretaceous rocks at less than 10-year intervals during the past 60 years, almost always during or shortly after prolonged periods of rainfall. In contrast, large-scale failures have been infrequent in the Charmouth Mudstone and have been restricted to areas where a low ( |
