''ROCK MARY
''May 23, 1849
''This odd and unusual land feature was named on that date by Lieuts. J.E. Simpson and M.P. Harrison when they visited this site, planted a flag on the crest and named the rock for 17 year belle, Mary Conway, an emigrant.
''Oklahoma Historical Society, 1960

''THE AMERICAN FLAG
''ROCK MARY
''From this point on May 23, 1849 the flag of the United States was unfurled by Lts. J.E. Simpson and M.P. Harrison who gave this rock its name. By this act they established this as a famous landmark relied on by countless thousands of western emigrants.
''Oklahoma Historical Society, 1960
Rock Mary was chosen as a landmark on the southern trail to California, called the California Trail by Captain Marcy. It stood out on the prairie and could be seen from a distance. The formation seen in the picture is low relative to the surrounding land and can not be seen from far away as it is in the breaks of the creek. Marcy picked the hill because of its prominence and just southeast of the foot of the hill was a spring (since gone dry) and a good camp ground with wood available in the nearby breaks.