The residual thickness of the Lower Jura (Lias) in the duck beak

The maximum thickness of the Lias (base Lower Jura to Middle Jura base or to prominent discordances in the top such as Upper Jura base and Upper Cretaceous base) is about 1 200 m and is reached in the southwest in a sink around the salt diapire Clara. Low-powered areas sometimes clearly trace the outcrop limits, suggesting a flat leakage of the layers. Often, the lias is discordantly cut in the slope by the units of the Malm (Upper Jura).里阿斯统（Lias）的最大厚度约为1200米，其地层区间为下侏罗统底界至中侏罗统底界，或顶界存在上侏罗统底界、白垩系上统底界这类显著不整合面；该最大厚度值见于西南部克拉拉盐底辟构造（salt diapire）周边的沉降带内。低能沉积区有时可清晰追索其露头边界，这指示地层呈平缓的侧向展布特征。马尔姆群（Malm）的地层单元常以不整合关系切穿斜坡上的里阿斯统地层。