Dakota Sandstone and Burro Canyon Formation

What the map says

Dakota Sandstone: yellowish-brown and gray friable to quartzitic sandstone and conglomeratic sandstone and interbedded gray to black carbonaceous shale. Contains a few thin very lenticular coal beds. Plant impressions commoon; basal conglomerate is locally present. Thickness 100-200 ft. Burro Canyon Formation: white, gray, and buff fine- to coarse-grained sandstone interbedded with green and purplish siltstone, shale, and mudstone, and thin beds of impure limestone. Sandstone is locally conglomeratic, particularly at base. Thickness a few feet to 125 feet. Lithology: sedimentary; clastic; sandstone; carbonaceous sand, shale, coal beds, and chert-pebble conglomerate.

1:100,000 sheet: Day and others, 1999, U.S. Geological Survey Open-File Report 99-0427 (17 crags). A contact line at that scale is about 100 m wide on the ground.

Served by Macrostrat (CC BY 4.0). The wording is the map's own, quoted as a fact about the mapped unit, not about any one wall.