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Penrose’s relations with The Geological Society of America were of long standing. He was elected to the Fellowship in May, 1889, while a member of the Geological Survey of Texas, having been proposed by R. T. Hill, Alpheus Hyatt, and J. J. Stevenson. He is number 151 on the roll books of the organization, so that he was a member practically from its beginning (the preliminary organisation meeting having been held in December, 1888). As already noted (chapter 6) he went with Branner to Indianapolis in the summer of 1891, where he read one of the two papers which he presented to the society, that one being on The Tertiary Iron Ores of Arkansas and Texas. The other paper was his presidential addres of 1930. He did make three other contributions to the Bulletin of the society, however, but they were all memorials— to Persifer Fraser, to Amos P. Brown, and to John C. Branner.According to the records, he attended fourteen annual meetings in those forty-one years, those of 1899, 1900, 1902, 1906, 1909, 1920, 1921, 1922, 1923, 1924, 1925, 1926, 1929, and 1930. He recommended only four men for membership— he may have signed other nominations, but only four were elected. They were James Perrin Smith, of Palo Alto, Calif., recommended by Branner and Penrose, and elected in December, 1893; Thomas C. Hopkins, of Chicago, recommended by Branner, James Perrin Smith, and Penrose, and elected December, 1894; Noah F. Drake, of Tientsin, China, recommended by Branner, R. T. Hill, Penrose, and F. W. Simonds, and elected December, 1898; and John F. Newsom, of Stanford University, recommended by Branner, Penrose, George H. Ashley, and T. C. Chamberlin, and elected December, 1899.

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