Three Other Eroded "Volcanic Necks" of the Navajo Volcanic Field

Perhaps a more accurate term for these Navajo Volcanic Field features is "Volcanic Center", as there are other features besides volcanic necks.  

[For the U.S. Hwy 491 (old U.S. 666) eroded Volcanic Centers, see this post on Itinerant Geologist.]

The others I have seen have been in the Kayenta, AZ and Monument Valley areas.

Amongst the easily-observed of the almost 80 eroded volcanic centers, evidence suggests origins as volcanic necks, plugs, maar-diatremes, and/and other features.  Shiprock is the most-photographed, while Agathla Peak (Figure 1) is likely second. 

 Figure 1.  Agathla Peak, unofficial "Gatekeeper" for Monument Valley, on U.S. Hwy 163, north of Kayenta, AZ (view from North).

 Figure 2.  Another favorite is Church Rock, on the north side of U.S. Hwy 160, northeast of Kayenta.  

On the day I passed by Church Rock, while traveling from Cortez, Colorado to Kayenta, then on to Monument Valley, I saw several other cars stop for photo-ops.

Figure 3.  Chaistla Butte, on U.S. Hwy. 163, northeast of Kayenta, AZ

Figure 4.  Church Rock (left foreground), Agathla Peak in the mid-right background.  

I am curious about the dark spires in the middle ground, some of which are silhouetted against Agathla Peak.  Is that another eroded volcanic center?

References

Chronic, H.  1983.   Roadside Geology of Arizona, Mountain Press Publishing Co.

Semken, S. 2003. Black rocks protruding up: the Navajo Volcanic Field. New Mexico Geological Society Guidebook, 54th Field Conference, September 24-27, 2003: 133-138. (semken.asu.edu/pubs/semken03_nvf.pdf)