A summit accordance exists when hill and mountaintops tops, and eventually also plateaux, have such disposition that they form a geometric plane that may be either horizontal or tilted. Summit accordances can be the vestiges of former continuous erosion surfaces that were uplifted and eroded. Other proposed explanations include:
- the possibility that erosion becomes more effective at height, tearing down mountains that stand out
- that isostasy regulates the height of individual mountain masses meaning that small mountains might be uplifted and large mountains dragged down
- that landscape dissection by uniformly spaced streams eventually reach a state in which summits attain similar heights
- that summit accordance is derivative of structural planes exposed by erosion
- Lidmar-Bergström, Karna. "Toppkonstans". Nationalencyklopedin (in Swedish). Cydonia Development. Retrieved June 22, 2015.
- Beckinsale, Robert P.; Chorley, Richard J. (2003) . "Chapter Seven: American Polycyclic Geomorphology". The History of the Study of Landforms. Volume Three. Taylor & Francis e-Library. pp. 235–236.