Oblique view looking northwest toward Llao Rock. The distance across the bottom of the image is about 1.9 kilometers (1.2 miles).

The great cliff of Llao Rock, a rhyodacite lava flow that erupted about 200 years before the collapse of Mount Mazama, towers nearly 600 meters (2,000 feet) above the surface of Crater Lake. Andesitic lava flows at the surface of the lake date from about 150,000 years old (this and other ages given in the perspective view captions are from Bacon and Lanphere, 1990). Submerged in Llao Bay are outcrops of lava flows from earlier periods of Mount Mazama`s growth. Below these and in Steel Bay the caldera wall is composed largely of talus and debris flow materials that extend onto the lake floor. Sediment fill in the northwest basin partly buries the lower wall deposits. Projecting from the caldera wall in the deep water of Steel Bay are prominent hills that may be in-place lava outcrops or huge, down-dropped blocks of caldera wall lavas. In the foreground are sinuous lava flows that emanate from a vent on the central platform. A small part of the central platform edifice occupies the lower left corner of the view.

Source: Gardner, James V., Peter Dartnell, Laurent Hellequin, Charles R. Bacon, Larry A. Mayer, and J. Christopher Stone. 2001. Bathymetry and selected perspective views of Crater Lake, Oregon. USGS Water Resources Investigations Report 01-4046.