464 CROSS AND HOWE — RED BEDS OP SOUTHWESTERN COLORADO 



Dolores valley, a few miles below Rico, when combined may serve to 

 illustrate the character of the formation. This combined section is given 

 below. The upper 1,118 feet (numbers 32 to 60) of this section was 

 measured by E. B. Mathews at several places on the northwest side of 

 the river above Priest gulch, while the lower 390 feet (numbers 1 to 31)* 

 was measured by Whitman Cross on the north side of Scotch creek, an 

 eastern tributary of the Dolores. The hiatus between the sections, if 

 there be any, is small. The Rico beds occur immediately beneath the 

 Scotch Creek section and the Dolores Triassic beds rest on the upper- 

 most stratum of the exposures near Priest gulch. 



Dolores River section of the Cutler formation 



Top Feet 

 60. Coarse sandstone or grit, cross-bedded, locally conglomeratic, rather 



purplish in tone 100 



59. Calcareous sandstones, sandy shales, often micaceous and fissile, either 



red or mottled red and green in color 120 



58. Grit-conglomerate, of variable texture, form i no; ledge outcrops 10 



57. Fine grained calcareous sandstones, sandy shales, with occasional thin 



layers of harder sandstones in red or variegated red and green. . ..... 80 



56. Sandy shales, with thin sandstones at intervals ; variegated or mottled 



dark red and light green ; have peculiar nodules 55 



55. Grit-conglomerate .... 20 



54. Calcareous sandstone or sandy shale 100 



53. Grit-conglomerate, very similar to number 60 30 



52. Friable sandstone 35 



51. Grit-conglomerate, hard and forming a prominent ledge outcrop 15 



50. Sandy shales and crumbling sandstone, strong red color, partly calca- 

 reous 110 



49. Calcareous shales 20 



48. Coarse arkose sandstone. 30 



47. Calcareous shales 30 



46. Sandstone variegated 20 



45. Calcareous shales 15 



44. Coarse sandstone, friable, variegated 15 



43. Hard sandstone, with few small pebbles of quartzite 15 



42. Dark red sandy shales ; in places calcareous and then massive ; in other 



parts micaceous and then fissile 90 



41. Compact arkose sandstone, with few pebbles ; cross-bedded ; friable 



sandstones near top 15 



40. Calcareous clay, or marl, reddish, with spots of various shades 33 



39. Friable sandstone, largely quartzitic, variegated in color 15 



38. Conglomerate and arkose grit ; most conglomeratic in center ; a grit with 

 some pebbles in upper and lower portions ; pebbles of greenish slates 



and schists, quartzite, granite, and greenish porphyry 30 



37. Calcareous shales, fine-grained, variegated 30 



36. Fine-grained, reddish shale 15 



