All the rocks of the Upper Blue Hills are part of the Mancos Shale formation, geologically more recent than most other parts of the Colorado Plateau. The top of the buttes and mesas is formed of the resistant Emery sandstone, overlying the Blue Gate shale which is particularly hostile to plant life and forms the stark bluish badlands that line much of the highway west of Hanksville. The occasional eroded sandstone formations found in the vicinity of Factory Butte, including hoodoos and small arches, are from the underlying Ferron sandstone, strata that also contain seams of coal, several feet thick in some places.
Map of Factory Butte and Vicinity
There are several rough trails around South Caineville Mesa
, and a few 4WD tracks to other places, but by far the easiest way to see some of the scenery away from the Hwy 24 is via the unpaved Factory Bench Road
, which heads northwards past the east end of Factory Butte and is suitable for any vehicle (when dry) for at least ten miles, until the ground starts to become more uneven near Salt Wash, at the south edge of the San Rafael Swell; after here the track turns east towards Little Wild Horse Canyon
and Goblin Valley
. Factory Bench Road is well maintained by the BLM, who have installed information boards along the way, have designated several areas for (free) primitive camping, and even added rest rooms at one location. ORVs have a long history of use in the Upper Blue Hills but are not allowed in the vicinity of Factory Butte in order to protect two rare and endangered cacti species - Wright fishhook cactus (sclerocactus wrightiae) and Winkler pincushion cactus (pediocactus winkleri), both are found in isolated locations around the lower slopes.
The road crosses a dead flat plateau of hard packed, greyish clay, covered only by sparse grasses, though this is still enough vegetation to nourish the cattle that roam these lands. The smooth section of the road ends after ten miles at a coal pit, a good camping spot; immediately northwest of here is one of the nice eroded areas, a white rock plateau sprinkled with small, delicate formations including arches, narrow fins and tiny hoodoos, reminiscent of the Bisti Wilderness
and other badlands of the San Juan Basin in New Mexico, and especially evocative near sunset. Other interesting sites are three narrow ravines that deepen just east of the road - two branches of Coal Mine Wash
and Neilson Wash
further south. Both are narrow and enclosed for a while, cutting through whitish/grey or brown rocks whose surface has been eroded into many cavities. The northern drainage is also bordered in part by black coal layers, and is joined by several other tributaries as it widens and winds eastwards. Neilson Wash has more extensive narrows, stepping downwards via a few dryfalls, and is interesting to follow for half a mile or so; judging by tire marks this is also a popular ORV destination.
Nearby towns with hotels are Caineville