by State, age, stratigraphic unit, quadrangle or county, and classification group..... Page 8 12 36 45...States of Colorado, Kansas, Montana, Nebraska, North Dakota, South Dakota, and Wyoming, was published...are assembled by group, State, county, and position within the county. The mixed-rock category is designated...for definition of groups.) 3 Clackamas County. (See p. 7 for county codes.) 19 Position of analysis in sequence...sequence of analyses from county. Lithology. The rock name given to a sample is that used in the original |