Lake Oroville olistostrome
Lake Oroville olistostrome
Permian
A small unit along the western arm of Lake Oroville. Boulders and megaboulders (olistoliths) of Early Permian limestone in a slatey matrix of pebbly mudstone. Originally mapped as part of the Clipper Gap Formation (unit YACG), the sedimentary matrix of the unit has yielded Paleozoic fossils (Watkins and others, 1987), so this unit is much older than the Clipper Gap Formation. Limestone block fossils are correlative with the McCloud Limestone of the eastern Klamath Mountains (Watkins and others, 1987). This unit is comparable with the lower part of the western (Soda Ravine) block of unit NSST in the Northern Sierra terrane.