Geologically the Ammergau Alps are mostly composed of Main Dolomite, which forms striking summits like the Kreuzspitze. Generally dolomite underlies the whole southern section of the range with the exception of small pockets of plattenkalk, which is why it has a relatively monotone topography. By contrast, the northern part is more varied and has a complicated stratigraphic sequence of. Here, although there is still dolomite in smaller areas, the predominant rock is Wetterstein limestone. The Ammergauer Hochplatte and the Säuling are the most impressive mountains made from this rock. In addition, small patches of argillite, marl, sandstones, radiolarite, conglomerates and gravel limestones enrich the landscape. Near the edge of the Alps, however, flysch appears over wide areas (Hohe Bleick, Hörnle) and, because of its susceptibility to erosion, forms rounded, frequently densely wooded mountains more typical of the Central Uplands.