Marine terrace on Santa Rosa Island, California

Marine terrace, dated to the ~80,000 year high-sea stand, overlain by windblown sand, Sandy Point, Santa Rosa Island; San Miguel Island in the background. Both islands in Channel Islands National Park, California (Muhs, D.R., Simmons, K.R., Groves, L.T., McGeehin, J.P., Schumann, R.R., Agenbroad, L.D., 2015, Late Quaternary sea-level history and the antiquity of mammoths (Mammuthus exilis and Mammuthus columbi), Channel Islands National Park, California, USA: Quaternary Research, v. 83, p. 502-521).