Approximate area of the Niagara Escarpment
Initial map created with this <a rel="nofollow" class="external text" href="http://www.aquarius.geomar.de/omc/">online map creation tool</a>, and then modified by hand, by me, to reproduce the information on <a rel="nofollow" class="external text" href="http://www.uwgb.edu/dutchs/geolwisc/niagesc.htm">this page</a>.
<a href="https://en.wikipedia.org/wiki/User:Geo_Swan" class="extiw" title="wikipedia:User:Geo Swan">Geo Swan</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
6 January 2005 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons by <a href="//commons.wikimedia.org/wiki/User:Geo_Swan" title="User:Geo Swan">Geo Swan</a> using <a href="https://iw.toolforge.org/commonshelper/" class="extiw" title="toollabs:commonshelper/">CommonsHelper</a>.