|Google Earth (2018) image|
Outcrop of the Barstow Formation, with tufa deposits indicated by the red arrows. There is horizontal development of tubes in the lower right-hand side of photo, scattered horizontal accumulation of tubes on left-side of photo, and a small cluster of fan-shaped tubes on the middle right-hand side of photo. Jacob's staff is 50 cm length; rock hammer is 32 cm length (12.5 in.).
Close-up of same small cluster of fan-shaped tubes shown in the previous photo (hammer is 32 cm length, 12.5 in). Notice the horizontal orientation of the tubes at the base of the cluster, whereas they bend upward with growth. Also, the tube diameter increases upward.
Close-up of some tubes showing corrugated or fluted surfaces. Coin (USA quarter) is 2.5 cm width.
Close-up of some tubes showing their cross section structure
(white part of Jacob's staffis 10 cm length). Some of the tubes are hollow, some one-half filled, and others are filled. Tubes vary in diameter, from pencil size to about 10 cm.
Largest cluster, approximately 1.3 m high.