Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

Table 4. Compilation of Miocene-Pliocene and Quaternary volcanic ash localities in the southern part of the Upper Arkansas graben
and South Arkansas graben. Locations are shown on figure 39.
DRY UNION FORMATION: VOLCANIC ASH LOCALITIES
No. LOCALITY LOCATION ASHES THICKNESS USGS# AGE REFERENCE
1 Salida Southwest Sec 7, T49N, R9E; Salida West quad 4 Plio. Van Alstine, 1969
2 Salida Southeast Sec 16, T49N, R9E; Wellsville quad 1 6" to 2' L. Mio. Van Alstine, 1969
3 Dead Goat Gulch Sec 20, T50N, R9E; Salida West quad 1 6" to 2' Plio. Van Alstine, 1969
4 Little Cochetopa Cr. E. Sec 7, T49N, R8E; Maysville quad 2() 3' Mio. Van Alstine, 1969
4A Little Cochetopa Cr. W. Sec 12, T49N, R7E; Maysville quad 2 6" and 1' Mio. This Study
5 Droney Gulch Sec 21, T50N, R7E; Salida West quad 2+ Plio.() Denesha, 2003
5A Droney Gulch West Sec 20, T50N, R7E; Salida West quad 1 Plio.() Denesha, 2003
6 Hecla Junction South Sec 34, T51N, R8E; Nathrop quad 1 USGS D296 E. Plio. Van Alstine, 1969
7 Section 16 Sec 16, T51N, R8E; Nathrop quad 1 USGS D-298 Plio. Van Alstine, 1969
QUATERNARY GRAVEL: VOLCANIC ASH LOCALITIES
No. LOCALITY LOCATION ASHES THICKNESS USGS# REFERENCE
Q1 Squaw Creek Sec 17, T50N, R8E; Salida West quad 1 USGS V-775 Scott and others, 1975
Q2 Browns Creek Sec 9, T51N, R8E; Nathrop quad 1 USGS V-767 Scott and others, 1975
Q3 Centerville Sec 35, T15S, R78W; Nathrop quad 1 USGS V-774 Scott and others, 1975
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