alluvial fans
... that the timing of mountain building can alter the shape and thickness of alluvial fans?
... that the timing of mountain building can alter the shape and thickness of <b id="mwA2I"><a href="./Tectonic_influences_on_alluvial_fans" id="mwA2M" rel="mw:WikiLink" title="Tectonic influences on alluvial fans">alluvial fans</a></b>?