Spattering is common in the area where lava sinks back into system,...

Spattering is common in the area where lava sinks back into the system, and this photo shows these processes are occurring in a small grotto. In the right portion of the photo, the ledge occupying much of the south part of the Overlook crater is visible. Parallel lines along the front face of this ledge might appear at first glance to be layering within the ledge, but are actually thin deposits of lava that mark recent levels of the lava lake, much like bathtub rings.