Charles L Powell

• A record of the inarticulate brachiopod Glottidia? from the ancestral Gulf of California, Miocene to Pliocene Imperial Formation, southern California
• Macrofossils from the Imperial Formation in the Ocotillo Wells State Vehicle Recreation Area, Imperial and San Diego counties, California
• Paleontology and significance of the Imperial Formation at Garnet Hill, Riverside County, California
• Publications of the Western Geologic Mapping Team 1997-1998
• The Purisima Formation and related rocks (upper Miocene - Pliocene), greater San Francisco Bay area, central California