Plio-Pleistocene landscape evolution in Northern Switzerland

Swiss Journal of Geosciences

Table 2 Analysis of apatite partial annealing zone (APAZ) constraints on missing overburden in northern Swiss Molasse basin and Tabular Jura

Borehole	Estimated thermal gradient at 5 Ma (°C/km)	Missing overburden (m)
Benken	35.3–58.8	665–1,852
Boswil	22.7–33.2	863–1,925
Herdern	32.4–40.4	478–1,088
Hünenberg	23.2–56.2	0–1,505
Schafisheim	27.3–47.5	0–1,348
Weiach	27.9–46.7	228–1,561

The line connecting the topmost limit of the upper inflection point with the lowermost limit of the lower inflection point (Fig. 6) represents the upper range of thickness of the fossil APAZ. The line connecting the lowest limit of the upper inflection point with the topmost limit of the lower inflection point represents the lower range of the thickness of the fossil APAZ (Fig. 6). This number gives a minimum estimate of former burial and a maximum estimate of the thermal gradient