[13]Taken mainly from Colorado State Planning Commission, 1959, Hamilton, 1956, Beckwith, 1854, and Hayden, 1877.
[14]Taken largely from Dellenbaugh, 1902.
[15]Information regarding Kodel and his mine was obtained mainly from Al Look and C. Frank Moore of Grand Junction and Mrs. Irving C. Beard of Fruita.
[16]For details see Lohman, 1965a.
[17]See [Lohman, 1974].
[18]The Geological Survey has divided the Precambrian into, from oldest to youngest, the Archean and Proterozoic Eons, with the boundary at 2,500 million years. The two eons now constitute Precambrian time.
[19]Potter and Rossman, 1977.
[20]According to Robert A. Cadigan, U.S. Geological Survey.
[21]See Pipiringos and O’Sullivan, 1975.
[22]See Wright, Shawe, and Lohman, 1962.