This feature is the remnant of differentially eroded Wingate Sandstone, which consists of wind-borne, cross-beddedquartzose sandstones deposited as ancient sand dunes approximately 200 million years ago in the Late Triassic. The caprock at the top of one of the four pillars consists of fluvial sandstones of the resistant Kayenta Formation. The slope around the base of the Coke Ovens is Chinle Formation.[5] The floor of the canyon is Precambrianbasement rock consisting of gneiss, schist, and granites. Precipitation runoff from this geographical feature drains to the Colorado River, approximately four miles to the northeast.
Climate
According to the Köppen climate classification system, Coke Ovens is located in a semi-arid climate zone.[6] Summers are hot and dry, while winters are cold with some snow. Temperatures reach 100 °F (38 °C) on 5.3 days, 90 °F (32 °C) on 57 days, and remain at or below freezing on 13 days annually. The months April through October offer the most favorable weather to visit.
^Stanley William Lohman, The Geologic Story of Colorado National Monument, Geological Survey Bulletin 1508, page 30.
^Stanley William Lohman, The Geologic Story of Colorado National Monument, Geological Survey Bulletin 1508, page 30.
^Peel, M. C.; Finlayson, B. L.; McMahon, T. A. (2007). "Updated world map of the Köppen−Geiger climate classification". Hydrol. Earth Syst. Sci. 11. ISSN1027-5606.