Summit accordance

The highest of hills in this picture show fairly similar heights making up a summit accordance. Aerial photograph from the Altai region of Russia.

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 eroded.^[1] Other proposed explanations include:^[2]

• the possibility that erosion is more effective at height, tearing down mountains that stand out
• that isostacy 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 reach similar heights
• that summit accordance is derivative of structural surfaces exposed by erosion

See also

• Dissected plateau
• Syrt

References

1. Lidmar-Bergström, Karna. "Toppkonstans". Nationalencyklopedin (in Swedish). Cydonia Development. Retrieved June 22, 2015.
2. Beckinsale, Robert P.; Chorley, Richard J. (2003) [1991]. "Chapter Seven: American Polycyclic Geomorphology". The History of the Study of Landforms. Volume Three. Taylor & Francis e-Library. pp. 235–236.