DESCRIPTIVE DETAILS : HAGAN FIELD 



633 



They were observed at the Tocco coal mine. The rocks above these coal 

 beds consist principally of coarse-grained, friable sandstone, and like the 

 basal sandstone just described are very different in appearance from any 

 of the sandstones associated with the lower coal beds in this field or in 

 the Mesaverde formation of the neighboring fields. For this reason these 

 rocks are regarded as possibly younger than Mesaverde. 



HAGAN FIELD 



The Hagan coal field lies east of the Eio Grande between the Sandia 

 and the Ortiz Mountains. The Hagan coal mine, from which this field 

 derives its name, is located about 14 miles southwest of Cerrillos. This 

 mine has been described by M. 11. Campbell (103, page 429), and Xhe 

 coal beds correlated by him and others with those opened in the same 

 field at the Sloan and the Pina Vititos mines. The rocks of this field dip 

 east at angles varying from 15 to 35 degrees and disappear under accu- 

 mulations of rock debris of comparatively recent origin. A section of 

 the Cretaceous rocks at Hagan was measured with tapeline across the 

 strike in an east-west direction, and the thicknesses given in the accom- 

 panying section were obtained by correcting for dip the distances meas- 

 ured at the outcrop. The rocks lying stratigraphically below the Dakota 

 were described by the writer (112, figure 2, page 19) a few years ago, 

 the top of the section measured at that time coinciding with the base of 

 the following section. The two may be combined to make a complete 

 section of the sedimentary rocks exposed east of the Sandia Mountains. 



Section of Rocks measured near Hagan, New Mexico 



Feet Inches 

 ( Conglomerate consisting of pebbles and boulders 

 up to several feet in diameter (several hundred 

 feet) 

 ( Unconformity. ) 



Shale and friable sandstone, highly colored in 

 many shades of purple, blue, green, yellow, etc. 2,500 



Sandstone, conglomeratic, with partings of red 

 shale ; a coarse conglomerate occurs at the 

 base. The sandstone is all coarse-grained, 

 granular, and friable 195 



Shale, sandy in some places, gypsiferous ; highly 

 colored like the shale above. 750 



Sandstone, yellow, conglomeratic at the base with 

 pebbles up to 4 inches in diameter in a matrix 

 of loose, friable sandstone. Pebbles consist 

 principally of quartz, qua rtzite, chert, jasper; 

 sandstone like those of lower horizons and frag- 

 ments of petrified wood. Sandstone is very 



Recent 



Tertiary ( ?) 



