| This scenario requires that a narrow zone of marine shale deposition should occur while the rest of the basin was undergoing subaerial erosion. |
| It is perceived, however, that subaerial erosion alone could scarcely have excavated deep canyons that extend down to the seafloor. |
| Unfortunately, subaerial erosion has made the continental sedimentary record very incomplete and discontinuous. |
| A thermal plume in the northwest part of the lake indicates underlying subaerial fumarolic or hydrothermal activity. |
| The presence of locally interbedded airfall tuffs implies subaerial eruption. |
| The unconformity surface is overlain by sandstone, reworked chalk or tuff, and represents submarine or subaerial erosion and missing section. |
