381, left M1; 598, left m2; 1000, right m1; 1001, right m2; 1079, right m2; 1674, right M2; and 3013, left m2. Locality and Stratigraphy.
"Records of the Fossil Mammal Sinclairella, Family Apatemyidae, From the Chadronian and Orellan"
William A. Clemens
In other areas there is an infinite variety of geologic conditions which affect the problem, and the geologist finds it necessary to bring to bear all the scientific knowledge of any sort which can be used,-particularly knowledge in relation to the type of rock, the Stratigraphy and the structure.
"The Economic Aspect of Geology"
C. K. Leith
It is obvious, also, that the identification and location of sedimentary geologic horizons are essential, and hence the application of principles of Stratigraphy.
"The Economic Aspect of Geology"
C. K. Leith