Posted on August 11, 2018 GeoCon 3 Comments Pic of the day #16 (Plumose structure) Block diagram showing the various components of an ideal plumose structure on a joint. The face of joint 1 is exposed; joint 2 is within the rock (b) (c) Types of plumose structure. (a) Straight plume. (b) Curvy plume. (c) Plume with many arrest lines, suggesting that it opened repeatedly.